mirror of
https://github.com/fish-shell/fish-shell
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Add "path" builtin
This adds a "path" builtin that can handle paths.
Implemented so far:
- "path filter PATHS", filters paths according to existence and optionally type and permissions
- "path base" and "path dir", run basename and dirname, respectively
- "path extension PATHS", prints the extension, if any
- "path strip-extension", prints the path without the extension
- "path normalize PATHS", normalizes paths - removing "/./" components
- and such.
- "path real", does realpath - i.e. normalizing *and* link resolution.
Some of these - base, dir, {strip-,}extension and normalize operate on the paths only as strings, so they handle nonexistent paths. filter and real ignore any nonexistent paths.
All output is split explicitly, so paths with newlines in them are
handled correctly. Alternatively, all subcommands have a "--null-input"/"-z" and "--null-output"/"-Z" option to handle null-terminated input and create null-terminated output. So
find . -print0 | path base -z
prints the basename of all files in the current directory,
recursively.
With "-Z" it also prints it null-separated.
(if stdout is going to a command substitution, we probably want to
skip this)
All subcommands also have a "-q"/"--quiet" flag that tells them to skip output. They return true "when something happened". For match/filter that's when a file passed, for "base"/"dir"/"extension"/"strip-extension" that's when something about the path *changed*.
Filtering
---------
`filter` supports all the file*types* `test` has - "dir", "file", "link", "block"..., as well as the permissions - "read", "write", "exec" and things like "suid".
It is missing the tty check and the check for the file being non-empty. The former is best done via `isatty`, the latter I don't think I've ever seen used.
There currently is no way to only get "real" files, i.e. ignore links pointing to files.
Examples
--------
> path real /bin///sh
/usr/bin/bash
> path extension foo.mp4
mp4
> path extension ~/.config
(nothing, because ".config" isn't an extension.)
This commit is contained in:
Fabian Homborg
parent
f5b1063a8b
commit
f6fb347d98
6 changed files with 1034 additions and 1 deletions
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@ -92,7 +92,7 @@ set(FISH_BUILTIN_SRCS
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src/builtins/disown.cpp src/builtins/echo.cpp src/builtins/emit.cpp
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src/builtins/eval.cpp src/builtins/exit.cpp src/builtins/fg.cpp
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src/builtins/function.cpp src/builtins/functions.cpp src/builtins/history.cpp
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src/builtins/jobs.cpp src/builtins/math.cpp src/builtins/printf.cpp
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src/builtins/jobs.cpp src/builtins/math.cpp src/builtins/printf.cpp src/builtin_path.cpp
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src/builtins/pwd.cpp src/builtins/random.cpp src/builtins/read.cpp
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src/builtins/realpath.cpp src/builtins/return.cpp src/builtins/set.cpp
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src/builtins/set_color.cpp src/builtins/source.cpp src/builtins/status.cpp
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268
doc_src/cmds/path.rst
Normal file
268
doc_src/cmds/path.rst
Normal file
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@ -0,0 +1,268 @@
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.. _cmd-path:
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path - manipulate and check paths
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=================================
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Synopsis
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--------
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::
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path base [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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path dir [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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path extension [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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path filter [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [(-t | --type) TYPE] [(-p | --perm) PERMISSION] [PATH...]
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path normalize [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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path real [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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path strip-extension [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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Description
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-----------
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``path`` performs operations on paths.
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PATH arguments are taken from the command line unless standard input is connected to a pipe or a file, in which case they are read from standard input, one PATH per line. It is an error to supply PATH arguments on the command line and on standard input.
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Arguments beginning with ``-`` are normally interpreted as switches; ``--`` causes the following arguments not to be treated as switches even if they begin with ``-``. Switches and required arguments are recognized only on the command line.
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All subcommands accept a ``-q`` or ``--quiet`` switch, which suppresses the usual output but exits with the documented status. In this case these commands will quit early, without reading all of the available input.
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All subcommands also accept a ``-z`` or ``--null-in`` switch, which makes them accept arguments from stdin separated with NULL-bytes. Since paths on uni can't contain NULL, that makes it possible to handle all possible paths and read input from e.g. ``find -print0``. If arguments are given on the commandline this has no effect.
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All subcommands also accept a ``-Z`` or ``--null-out`` switch, which makes them print output separated with NULL instead of newlines. This is for further processing, e.g. passing to another ``path`` with ``--null-in``, or ``xargs -0``. This is not recommended when the output goes to the terminal or a command substitution.
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Some subcommands operate on the paths as strings and so work on nonexistent paths, while others need to access the paths themselves and so filter out nonexistent paths.
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The following subcommands are available.
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.. _cmd-path-base:
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"base" subcommand
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--------------------
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::
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path base [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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``path base`` returns the basename for the given path. This is the part after the last "/", discounting trailing slashes. In other words, it is the part that is not the dirname (discounting superfluous slashes).
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It returns 0 if there was a basename, i.e. if the path wasn't empty or just slashes.
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Examples
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^^^^^^^^
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::
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>_ path base ./foo.mp4
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foo.mp4
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>_ path base ../banana
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banana
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>_ path base /usr/bin/
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bin
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"dir" subcommand
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--------------------
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::
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path dir [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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``path dir`` returns the dirname for the given path. This is the part before the last "/", discounting trailing slashes. In other words, it is the part that is not the basename (discounting superfluous slashes).
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It returns 0 if there was a dirname, i.e. if the path wasn't empty or just slashes.
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Examples
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^^^^^^^^
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::
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>_ path dir ./foo.mp4
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.
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>_ path base ../banana
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banana
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>_ path base /usr/bin/
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bin
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"extension" subcommand
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-----------------------
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::
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path extension [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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``path extension`` returns the extension for the given path. This is the part after (and excluding) the last ".", unless that "." followed a "/" or the basename is "." or "..", in which case there is no extension and nothing is printed.
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If the filename ends in a ".", the extension is empty, so an empty line will be printed.
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It returns 0 if there was an extension.
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Examples
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^^^^^^^^
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::
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>_ path extension ./foo.mp4
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mp4
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>_ path extension ../banana
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# nothing, status 1
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>_ path extension ~/.config
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# nothing, status 1
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>_ path extension ~/.config.d
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d
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>_ path extension ~/.config.
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# one empty line, status 0
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"filter" subcommand
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--------------------
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::
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path filter [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [(-t | --type) TYPE] [(-p | --perm) PERMISSION] [PATH...]
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``path filter`` returns all of the given paths that match the checks it was given. In all cases, the paths need to exist, nonexistent paths are always filtered.
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The available filters are:
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- ``-t`` or ``--type`` with the options: "dir", "file", "link", "block", "char", "fifo", "socket" and "link", in which case the path needs to be a directory, file, link, block device, character device, named pipe, socket or symbolic link, respectively.
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- ``-p`` or ``--perm`` with the options: "read", "write", and "exec", as well as "suid", "sgid", "sticky", "user" (referring to the path owner) and "group" (referring to the path's group), in which case the path needs to have all of the given permissions for the current user.
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Note that the path needs to be *any* of the given types, but have *all* of the given permissions. The filter options can either be given as multiple options, or comma-separated - ``path filter -t dir,file`` or ``path filter --type dir --type file`` are equivalent.
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And if your operating system doesn't support a "sticky" bit, checking for it will always be false, so no path will pass.
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It returns 0 if at least one path passed the filter.
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Examples
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^^^^^^^^
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::
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>_ path filter /usr/bin /usr/argagagji
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# The (hopefully) nonexistent argagagji is filtered implicitly:
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/usr/bin
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>_ path filter --type file /usr/bin /usr/bin/fish
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# Only fish is a file
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/usr/bin/fish
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>_ path filter --type file,dir --perm exec,write /usr/bin/fish /home/me
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# fish is a file, which passes, and executable, which passes,
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# but probably not writable, which fails.
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#
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# $HOME is a directory and both writable and executable, typically.
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# So it passes.
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/home/me
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"normalize" subcommand
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-----------------------
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::
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path normalize [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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``path normalize`` returns the normalized versions of all paths. That means it squashes duplicate "/" (except for two leading "//"), collapses "../" with earlier components and removes "." components.
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It is the same as ``realpath --no-symlinks``, as it creates the "real", canonical version of the path but doesn't resolve any symlinks. As such it can operate on nonexistent paths.
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It returns 0 if any normalization was done, i.e. any given path wasn't in canonical form.
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Examples
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^^^^^^^^
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::
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>_ path normalize /usr/bin//../../etc/fish
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# The "//" is squashed and the ".." components neutralize the components before
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/etc/fish
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>_ path normalize /bin//bash
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# The "//" is squashed, but /bin isn't resolved even if your system links it to /usr/bin.
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/bin/bash
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"real" subcommand
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--------------------
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::
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path real [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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``path normalize`` returns the normalized, physical versions of all paths. That means it resolves symlinks and does what ``path normalize`` does: it squashes duplicate "/" (except for two leading "//"), collapses "../" with earlier components and removes "." components.
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It is the same as ``realpath``, as it creates the "real", canonical version of the path. As such it can't operate on nonexistent paths.
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It returns 0 if any normalization or resolution was done, i.e. any given path wasn't in canonical form.
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Examples
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^^^^^^^^
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::
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>_ path real /bin//sh
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# The "//" is squashed, and /bin is resolved if your system links it to /usr/bin.
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# sh here is bash (on an Archlinux system)
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/usr/bin/bash
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"strip-extension" subcommand
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----------------------------
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::
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path strip-extension [(-z | --null-in)] [(-Z | --null-out)] [(-q | --quiet)] [PATH...]
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``path strip-extension`` returns the given paths without the extension. This is the part after (and excluding) the last ".", unless that "." followed a "/" or the basename is "." or "..", in which case there is no extension and the full path is printed.
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This is, of course, the inverse of ``path extension``.
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It returns 0 if there was an extension.
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Examples
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^^^^^^^^
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::
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>_ path strip.extension ./foo.mp4
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./foo
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>_ path strip-extension ../banana
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../banana
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# but status 1, because there was no extension.
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>_ path strip-extension ~/.config
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/home/alfa/.config
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# status 1
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>_ path extension ~/.config.d
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/home/alfa/.config
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# status 0
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>_ path extension ~/.config.
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/home/alfa/.config
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# status 0
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Combining ``path``
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-------------------
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``path`` is meant to be easy to combine with itself, other tools and fish.
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This is why
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- ``path``'s output is automatically split by fish if it goes into a command substitution, so just doing ``(path ...)`` handles all paths, even those containing newlines, correctly
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- ``path`` has ``--null-in`` to handle null-delimited input, and ``--null-out`` to pass on null-delimited output
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Some examples of combining ``path``::
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# Expand all paths in the current directory, leave only executable files, and print their real path
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path expand '*' -Z | path filter -zZ --perm=exec --type=file | path real -z
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# The same thing, but using find (note -maxdepth needs to come first or find will scream)
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# (this also depends on your particular version of find)
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find . -maxdepth 1 -type f -executable -print0 | path real -z
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set -l paths (path filter -p exec $PATH/fish -Z | path real)
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@ -65,6 +65,7 @@
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#include "builtins/type.h"
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#include "builtins/ulimit.h"
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#include "builtins/wait.h"
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#include "builtin_path.h"
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#include "common.h"
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#include "complete.h"
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#include "exec.h"
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@ -393,6 +394,7 @@ static constexpr builtin_data_t builtin_datas[] = {
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{L"math", &builtin_math, N_(L"Evaluate math expressions")},
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{L"not", &builtin_generic, N_(L"Negate exit status of job")},
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{L"or", &builtin_generic, N_(L"Execute command if previous command failed")},
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{L"path", &builtin_path, N_(L"Handle paths")},
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{L"printf", &builtin_printf, N_(L"Prints formatted text")},
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{L"pwd", &builtin_pwd, N_(L"Print the working directory")},
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{L"random", &builtin_random, N_(L"Generate random number")},
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644
src/builtin_path.cpp
Normal file
644
src/builtin_path.cpp
Normal file
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@ -0,0 +1,644 @@
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// Implementation of the string builtin.
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#include "config.h" // IWYU pragma: keep
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <glob.h>
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#include <string>
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#include <utility>
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#include <vector>
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#include "builtin.h"
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#include "common.h"
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#include "fallback.h" // IWYU pragma: keep
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#include "io.h"
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#include "wcstringutil.h"
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#include "wgetopt.h"
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#include "wutil.h" // IWYU pragma: keep
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// How many bytes we read() at once.
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// Bash uses 128 here, so we do too (see READ_CHUNK_SIZE).
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// This should be about the size of a line.
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#define PATH_CHUNK_SIZE 128
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static void path_error(io_streams_t &streams, const wchar_t *fmt, ...) {
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streams.err.append(L"path ");
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va_list va;
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va_start(va, fmt);
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streams.err.append_formatv(fmt, va);
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va_end(va);
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}
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static void path_unknown_option(parser_t &parser, io_streams_t &streams, const wchar_t *subcmd,
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const wchar_t *opt) {
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path_error(streams, BUILTIN_ERR_UNKNOWN, subcmd, opt);
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builtin_print_error_trailer(parser, streams.err, L"path");
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}
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// We read from stdin if we are the second or later process in a pipeline.
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static bool path_args_from_stdin(const io_streams_t &streams) {
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return streams.stdin_is_directly_redirected;
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}
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static const wchar_t *path_get_arg_argv(int *argidx, const wchar_t *const *argv) {
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return argv && argv[*argidx] ? argv[(*argidx)++] : nullptr;
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}
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// A helper type for extracting arguments from either argv or stdin.
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namespace {
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class arg_iterator_t {
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// The list of arguments passed to the string builtin.
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const wchar_t *const *argv_;
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// If using argv, index of the next argument to return.
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int argidx_;
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// If not using argv, a string to store bytes that have been read but not yet returned.
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std::string buffer_;
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// The char to split on when reading from stdin.
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const char split_;
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// Backing storage for the next() string.
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wcstring storage_;
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const io_streams_t &streams_;
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/// Reads the next argument from stdin, returning true if an argument was produced and false if
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/// not. On true, the string is stored in storage_.
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bool get_arg_stdin() {
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assert(path_args_from_stdin(streams_) && "should not be reading from stdin");
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assert(streams_.stdin_fd >= 0 && "should have a valid fd");
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// Read in chunks from fd until buffer has a line (or the end if split_ is unset).
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size_t pos;
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while ((pos = buffer_.find(split_)) == std::string::npos) {
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char buf[PATH_CHUNK_SIZE];
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long n = read_blocked(streams_.stdin_fd, buf, PATH_CHUNK_SIZE);
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if (n == 0) {
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// If we still have buffer contents, flush them,
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// in case there was no trailing sep.
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if (buffer_.empty()) return false;
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storage_ = str2wcstring(buffer_);
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buffer_.clear();
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return true;
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}
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if (n == -1) {
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// Some error happened. We can't do anything about it,
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// so ignore it.
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// (read_blocked already retries for EAGAIN and EINTR)
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storage_ = str2wcstring(buffer_);
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buffer_.clear();
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return false;
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}
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buffer_.append(buf, n);
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}
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// Split the buffer on the sep and return the first part.
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storage_ = str2wcstring(buffer_, pos);
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buffer_.erase(0, pos + 1);
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return true;
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}
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public:
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arg_iterator_t(const wchar_t *const *argv, int argidx, const io_streams_t &streams,
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char split = '\n')
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: argv_(argv), argidx_(argidx), split_(split), streams_(streams) {}
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const wcstring *nextstr() {
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if (path_args_from_stdin(streams_)) {
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return get_arg_stdin() ? &storage_ : nullptr;
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}
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if (auto arg = path_get_arg_argv(&argidx_, argv_)) {
|
||||
storage_ = arg;
|
||||
return &storage_;
|
||||
} else {
|
||||
return nullptr;
|
||||
}
|
||||
}
|
||||
};
|
||||
} // namespace
|
||||
|
||||
enum {
|
||||
TYPE_BLOCK = 1 << 0, /// A block device
|
||||
TYPE_DIR = 1 << 1, /// A directory
|
||||
TYPE_FILE = 1 << 2, /// A regular file
|
||||
TYPE_LINK = 1 << 3, /// A link
|
||||
TYPE_CHAR = 1 << 4, /// A character device
|
||||
TYPE_FIFO = 1 << 5, /// A fifo
|
||||
TYPE_SOCK = 1 << 6, /// A socket
|
||||
};
|
||||
typedef uint32_t path_type_flags_t;
|
||||
|
||||
enum {
|
||||
PERM_READ = 1 << 0,
|
||||
PERM_WRITE = 1 << 1,
|
||||
PERM_EXEC = 1 << 2,
|
||||
PERM_SUID = 1 << 3,
|
||||
PERM_SGID = 1 << 4,
|
||||
PERM_STICKY = 1 << 5,
|
||||
PERM_USER = 1 << 6,
|
||||
PERM_GROUP = 1 << 7,
|
||||
};
|
||||
typedef uint32_t path_perm_flags_t;
|
||||
|
||||
// This is used by the string subcommands to communicate with the option parser which flags are
|
||||
// valid and get the result of parsing the command for flags.
|
||||
struct options_t { //!OCLINT(too many fields)
|
||||
bool perm_valid = false;
|
||||
bool type_valid = false;
|
||||
|
||||
bool null_in = false;
|
||||
bool null_out = false;
|
||||
|
||||
bool quiet = false;
|
||||
|
||||
bool have_type = false;
|
||||
path_type_flags_t type = 0;
|
||||
|
||||
bool have_perm = false;
|
||||
// Whether we need to check a special permission like suid.
|
||||
bool have_special_perm = false;
|
||||
path_perm_flags_t perm = 0;
|
||||
};
|
||||
|
||||
static void path_out(io_streams_t &streams, const options_t &opts, const wcstring &str) {
|
||||
if (!opts.quiet) {
|
||||
if (!opts.null_out) {
|
||||
streams.out.append_with_separation(str,
|
||||
separation_type_t::explicitly);
|
||||
} else {
|
||||
streams.out.append(str);
|
||||
streams.out.push_back(L'\0');
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static int handle_flag_q(const wchar_t **argv, parser_t &parser, io_streams_t &streams,
|
||||
const wgetopter_t &w, options_t *opts) {
|
||||
UNUSED(argv);
|
||||
UNUSED(parser);
|
||||
UNUSED(streams);
|
||||
UNUSED(w);
|
||||
opts->quiet = true;
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
|
||||
static int handle_flag_z(const wchar_t **argv, parser_t &parser, io_streams_t &streams,
|
||||
const wgetopter_t &w, options_t *opts) {
|
||||
UNUSED(argv);
|
||||
UNUSED(parser);
|
||||
UNUSED(streams);
|
||||
UNUSED(w);
|
||||
opts->null_in = true;
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
|
||||
static int handle_flag_Z(const wchar_t **argv, parser_t &parser, io_streams_t &streams,
|
||||
const wgetopter_t &w, options_t *opts) {
|
||||
UNUSED(argv);
|
||||
UNUSED(parser);
|
||||
UNUSED(streams);
|
||||
UNUSED(w);
|
||||
opts->null_out = true;
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
|
||||
static int handle_flag_t(const wchar_t **argv, parser_t &parser, io_streams_t &streams,
|
||||
const wgetopter_t &w, options_t *opts) {
|
||||
if (opts->type_valid) {
|
||||
if (!opts->have_type) opts->type = 0;
|
||||
opts->have_type = true;
|
||||
wcstring_list_t types = split_string_tok(w.woptarg, L",");
|
||||
for (auto t : types) {
|
||||
if (t == L"file") {
|
||||
opts->type |= TYPE_FILE;
|
||||
} else if (t == L"dir") {
|
||||
opts->type |= TYPE_DIR;
|
||||
} else if (t == L"block") {
|
||||
opts->type |= TYPE_BLOCK;
|
||||
} else if (t == L"char") {
|
||||
opts->type |= TYPE_CHAR;
|
||||
} else if (t == L"fifo") {
|
||||
opts->type |= TYPE_FIFO;
|
||||
} else if (t == L"socket") {
|
||||
opts->type |= TYPE_SOCK;
|
||||
} else if (t == L"link") {
|
||||
opts->type |= TYPE_LINK;
|
||||
} else {
|
||||
path_error(streams, _(L"%ls: Invalid type '%ls'"), L"path", t.c_str());
|
||||
return STATUS_INVALID_ARGS;
|
||||
}
|
||||
}
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
path_unknown_option(parser, streams, argv[0], argv[w.woptind - 1]);
|
||||
return STATUS_INVALID_ARGS;
|
||||
}
|
||||
|
||||
|
||||
static int handle_flag_p(const wchar_t **argv, parser_t &parser, io_streams_t &streams,
|
||||
const wgetopter_t &w, options_t *opts) {
|
||||
if (opts->perm_valid) {
|
||||
if (!opts->have_perm) opts->perm = 0;
|
||||
opts->have_perm = true;
|
||||
wcstring_list_t perms = split_string_tok(w.woptarg, L",");
|
||||
for (auto p : perms) {
|
||||
if (p == L"read") {
|
||||
opts->perm |= PERM_READ;
|
||||
} else if (p == L"write") {
|
||||
opts->perm |= PERM_WRITE;
|
||||
} else if (p == L"exec") {
|
||||
opts->perm |= PERM_EXEC;
|
||||
} else if (p == L"suid") {
|
||||
opts->perm |= PERM_SUID;
|
||||
opts->have_special_perm = true;
|
||||
} else if (p == L"sgid") {
|
||||
opts->perm |= PERM_SGID;
|
||||
opts->have_special_perm = true;
|
||||
} else if (p == L"sticky") {
|
||||
opts->perm |= PERM_STICKY;
|
||||
opts->have_special_perm = true;
|
||||
} else if (p == L"user") {
|
||||
opts->perm |= PERM_USER;
|
||||
opts->have_special_perm = true;
|
||||
} else if (p == L"group") {
|
||||
opts->perm |= PERM_GROUP;
|
||||
opts->have_special_perm = true;
|
||||
} else {
|
||||
path_error(streams, _(L"%ls: Invalid permission '%ls'"), L"path", p.c_str());
|
||||
return STATUS_INVALID_ARGS;
|
||||
}
|
||||
}
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
path_unknown_option(parser, streams, argv[0], argv[w.woptind - 1]);
|
||||
return STATUS_INVALID_ARGS;
|
||||
}
|
||||
|
||||
/// This constructs the wgetopt() short options string based on which arguments are valid for the
|
||||
/// subcommand. We have to do this because many short flags have multiple meanings and may or may
|
||||
/// not require an argument depending on the meaning.
|
||||
static wcstring construct_short_opts(options_t *opts) { //!OCLINT(high npath complexity)
|
||||
// All commands accept -z, -Z and -q
|
||||
wcstring short_opts(L":zZq");
|
||||
if (opts->perm_valid) short_opts.append(L"p:");
|
||||
if (opts->type_valid) short_opts.append(L"t:");
|
||||
return short_opts;
|
||||
}
|
||||
|
||||
// Note that several long flags share the same short flag. That is okay. The caller is expected
|
||||
// to indicate that a max of one of the long flags sharing a short flag is valid.
|
||||
// Remember: adjust share/completions/string.fish when `string` options change
|
||||
static const struct woption long_options[] = {
|
||||
{L"quiet", no_argument, nullptr, 'q'},
|
||||
{L"null-input", no_argument, nullptr, 'z'},
|
||||
{L"null-output", no_argument, nullptr, 'Z'},
|
||||
{L"perm", required_argument, nullptr, 'p'},
|
||||
{L"type", required_argument, nullptr, 't'},
|
||||
{nullptr, 0, nullptr, 0}};
|
||||
|
||||
static const std::unordered_map<char, decltype(*handle_flag_q)> flag_to_function = {
|
||||
{'q', handle_flag_q},
|
||||
{'z', handle_flag_z}, {'Z', handle_flag_Z},
|
||||
{'t', handle_flag_t}, {'p', handle_flag_p},
|
||||
};
|
||||
|
||||
/// Parse the arguments for flags recognized by a specific string subcommand.
|
||||
static int parse_opts(options_t *opts, int *optind, int argc, const wchar_t **argv,
|
||||
parser_t &parser, io_streams_t &streams) {
|
||||
const wchar_t *cmd = argv[0];
|
||||
wcstring short_opts = construct_short_opts(opts);
|
||||
const wchar_t *short_options = short_opts.c_str();
|
||||
int opt;
|
||||
wgetopter_t w;
|
||||
while ((opt = w.wgetopt_long(argc, argv, short_options, long_options, nullptr)) != -1) {
|
||||
auto fn = flag_to_function.find(opt);
|
||||
if (fn != flag_to_function.end()) {
|
||||
int retval = fn->second(argv, parser, streams, w, opts);
|
||||
if (retval != STATUS_CMD_OK) return retval;
|
||||
} else if (opt == ':') {
|
||||
streams.err.append(L"path "); // clone of string_error
|
||||
builtin_missing_argument(parser, streams, cmd, argv[w.woptind - 1],
|
||||
false /* print_hints */);
|
||||
return STATUS_INVALID_ARGS;
|
||||
} else if (opt == '?') {
|
||||
path_unknown_option(parser, streams, cmd, argv[w.woptind - 1]);
|
||||
return STATUS_INVALID_ARGS;
|
||||
} else {
|
||||
DIE("unexpected retval from wgetopt_long");
|
||||
}
|
||||
}
|
||||
|
||||
*optind = w.woptind;
|
||||
|
||||
// At this point we should not have optional args and be reading args from stdin.
|
||||
if (path_args_from_stdin(streams) && argc > *optind) {
|
||||
path_error(streams, BUILTIN_ERR_TOO_MANY_ARGUMENTS, cmd);
|
||||
return STATUS_INVALID_ARGS;
|
||||
}
|
||||
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
|
||||
static int path_transform(parser_t &parser, io_streams_t &streams, int argc, const wchar_t **argv,
|
||||
wcstring (*func)(wcstring)) {
|
||||
options_t opts;
|
||||
int optind;
|
||||
int retval = parse_opts(&opts, &optind, argc, argv, parser, streams);
|
||||
if (retval != STATUS_CMD_OK) return retval;
|
||||
|
||||
int n_transformed = 0;
|
||||
arg_iterator_t aiter(argv, optind, streams, opts.null_in ? '\0' : '\n');
|
||||
while (const wcstring *arg = aiter.nextstr()) {
|
||||
wcstring transformed(*arg);
|
||||
// Empty paths make no sense, but e.g. wbasename returns true for them.
|
||||
if (arg->empty()) continue;
|
||||
transformed = func(*arg);
|
||||
if (transformed != *arg) {
|
||||
n_transformed++;
|
||||
// Return okay if path wasn't already in this form
|
||||
// TODO: Is that correct?
|
||||
if (opts.quiet) return STATUS_CMD_OK;
|
||||
}
|
||||
path_out(streams, opts, transformed);
|
||||
}
|
||||
|
||||
return n_transformed > 0 ? STATUS_CMD_OK : STATUS_CMD_ERROR;
|
||||
}
|
||||
|
||||
|
||||
static int path_base(parser_t &parser, io_streams_t &streams, int argc, const wchar_t **argv) {
|
||||
return path_transform(parser, streams, argc, argv, wbasename);
|
||||
}
|
||||
|
||||
static int path_dir(parser_t &parser, io_streams_t &streams, int argc, const wchar_t **argv) {
|
||||
return path_transform(parser, streams, argc, argv, wdirname);
|
||||
}
|
||||
|
||||
// Not a constref because this must have the same type as wdirname.
|
||||
// cppcheck-suppress passedByValue
|
||||
static wcstring normalize_helper(wcstring path) {
|
||||
return normalize_path(path, false);
|
||||
}
|
||||
|
||||
static bool filter_path(options_t opts, const wcstring &path) {
|
||||
// TODO: Add moar stuff:
|
||||
// fifos, sockets, size greater than zero, setuid, ...
|
||||
// Nothing to check, file existence is checked elsewhere.
|
||||
if (!opts.have_type && !opts.have_perm) return true;
|
||||
|
||||
if (opts.have_type) {
|
||||
bool type_ok = false;
|
||||
struct stat buf;
|
||||
if (opts.type & TYPE_LINK) {
|
||||
auto lret = !lwstat(path, &buf);
|
||||
type_ok = lret && S_ISLNK(buf.st_mode);
|
||||
}
|
||||
|
||||
auto ret = !wstat(path, &buf);
|
||||
if (!ret) {
|
||||
// Does not exist
|
||||
return false;
|
||||
}
|
||||
if (!type_ok && opts.type & TYPE_FILE && S_ISREG(buf.st_mode)) {
|
||||
type_ok = true;
|
||||
}
|
||||
if (!type_ok && opts.type & TYPE_DIR && S_ISDIR(buf.st_mode)) {
|
||||
type_ok = true;
|
||||
}
|
||||
if (!type_ok && opts.type & TYPE_BLOCK && S_ISBLK(buf.st_mode)) {
|
||||
type_ok = true;
|
||||
}
|
||||
if (!type_ok && opts.type & TYPE_CHAR && S_ISCHR(buf.st_mode)) {
|
||||
type_ok = true;
|
||||
}
|
||||
if (!type_ok && opts.type & TYPE_FIFO && S_ISFIFO(buf.st_mode)) {
|
||||
type_ok = true;
|
||||
}
|
||||
if (!type_ok && opts.type & TYPE_SOCK && S_ISSOCK(buf.st_mode)) {
|
||||
type_ok = true;
|
||||
}
|
||||
if (!type_ok) return false;
|
||||
}
|
||||
if (opts.have_perm) {
|
||||
int amode = 0;
|
||||
if (opts.perm & PERM_READ) amode |= R_OK;
|
||||
if (opts.perm & PERM_WRITE) amode |= W_OK;
|
||||
if (opts.perm & PERM_EXEC) amode |= X_OK;
|
||||
// access returns 0 on success,
|
||||
// -1 on failure. Yes, C can't even keep its bools straight.
|
||||
if (waccess(path, amode)) return false;
|
||||
|
||||
// Permissions that require special handling
|
||||
if (opts.have_special_perm) {
|
||||
struct stat buf;
|
||||
auto ret = !wstat(path, &buf);
|
||||
if (!ret) {
|
||||
// Does not exist, WTF?
|
||||
return false;
|
||||
}
|
||||
|
||||
if (opts.perm & PERM_SUID && !(S_ISUID & buf.st_mode)) return false;
|
||||
if (opts.perm & PERM_SGID && !(S_ISGID & buf.st_mode)) return false;
|
||||
if (opts.perm & PERM_USER && !(geteuid() == buf.st_uid)) return false;
|
||||
if (opts.perm & PERM_GROUP && !(getegid() == buf.st_gid)) return false;
|
||||
if (opts.perm & PERM_STICKY && !(S_ISVTX & buf.st_mode)) return false;
|
||||
}
|
||||
}
|
||||
|
||||
// No filters failed.
|
||||
return true;
|
||||
}
|
||||
|
||||
static int path_normalize(parser_t &parser, io_streams_t &streams, int argc, const wchar_t **argv) {
|
||||
return path_transform(parser, streams, argc, argv, normalize_helper);
|
||||
}
|
||||
|
||||
static maybe_t<size_t> find_extension (const wcstring &path) {
|
||||
// The extension belongs to the basename,
|
||||
// if there is a "." before the last component it doesn't matter.
|
||||
// e.g. ~/.config/fish/conf.d/foo
|
||||
// does not have an extension! The ".d" here is not a file extension for "foo".
|
||||
// And "~/.config" doesn't have an extension either - the ".config" is the filename.
|
||||
wcstring filename = wbasename(path);
|
||||
|
||||
// "." and ".." aren't really *files* and therefore don't have an extension.
|
||||
if (filename == L"." || filename == L"..") return none();
|
||||
|
||||
// If we don't have a "." or the "." is the first in the filename,
|
||||
// we do not have an extension
|
||||
size_t pos = filename.find_last_of(L".");
|
||||
if (pos == wcstring::npos || pos == 0) {
|
||||
return none();
|
||||
}
|
||||
|
||||
// Convert pos back to what it would be in the original path.
|
||||
return pos + path.size() - filename.size();
|
||||
}
|
||||
|
||||
static int path_extension(parser_t &parser, io_streams_t &streams, int argc, const wchar_t **argv) {
|
||||
options_t opts;
|
||||
int optind;
|
||||
int retval = parse_opts(&opts, &optind, argc, argv, parser, streams);
|
||||
if (retval != STATUS_CMD_OK) return retval;
|
||||
|
||||
int n_transformed = 0;
|
||||
arg_iterator_t aiter(argv, optind, streams, opts.null_in ? '\0' : '\n');
|
||||
while (const wcstring *arg = aiter.nextstr()) {
|
||||
auto pos = find_extension(*arg);
|
||||
|
||||
if (!pos) continue;
|
||||
|
||||
// This ends up being empty if the filename ends with ".".
|
||||
// That's arguably correct.
|
||||
//
|
||||
// So we print an empty string but return true,
|
||||
// because there *is* an extension, it just happens to be empty.
|
||||
wcstring ext = arg->substr(*pos + 1);
|
||||
if (opts.quiet && !ext.empty()) {
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
path_out(streams, opts, ext);
|
||||
n_transformed++;
|
||||
}
|
||||
|
||||
return n_transformed > 0 ? STATUS_CMD_OK : STATUS_CMD_ERROR;
|
||||
}
|
||||
|
||||
static int path_strip_extension(parser_t &parser, io_streams_t &streams, int argc, const wchar_t **argv) {
|
||||
options_t opts;
|
||||
int optind;
|
||||
int retval = parse_opts(&opts, &optind, argc, argv, parser, streams);
|
||||
if (retval != STATUS_CMD_OK) return retval;
|
||||
|
||||
int n_transformed = 0;
|
||||
arg_iterator_t aiter(argv, optind, streams, opts.null_in ? '\0' : '\n');
|
||||
while (const wcstring *arg = aiter.nextstr()) {
|
||||
auto pos = find_extension(*arg);
|
||||
|
||||
if (!pos) {
|
||||
path_out(streams, opts, *arg);
|
||||
continue;
|
||||
}
|
||||
|
||||
// This ends up being empty if the filename ends with ".".
|
||||
// That's arguably correct.
|
||||
//
|
||||
// So we print an empty string but return true,
|
||||
// because there *is* an extension, it just happens to be empty.
|
||||
wcstring ext = arg->substr(0, *pos);
|
||||
if (opts.quiet && !ext.empty()) {
|
||||
// Return 0 if we *had* an extension
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
path_out(streams, opts, ext);
|
||||
n_transformed++;
|
||||
}
|
||||
|
||||
return n_transformed > 0 ? STATUS_CMD_OK : STATUS_CMD_ERROR;
|
||||
}
|
||||
|
||||
static int path_real(parser_t &parser, io_streams_t &streams, int argc, const wchar_t **argv) {
|
||||
options_t opts;
|
||||
int optind;
|
||||
int retval = parse_opts(&opts, &optind, argc, argv, parser, streams);
|
||||
if (retval != STATUS_CMD_OK) return retval;
|
||||
|
||||
int n_transformed = 0;
|
||||
arg_iterator_t aiter(argv, optind, streams, opts.null_in ? '\0' : '\n');
|
||||
while (const wcstring *arg = aiter.nextstr()) {
|
||||
auto real = wrealpath(*arg);
|
||||
|
||||
if (!real) {
|
||||
continue;
|
||||
}
|
||||
|
||||
// Return 0 if we found a realpath.
|
||||
if (opts.quiet) {
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
path_out(streams, opts, *real);
|
||||
n_transformed++;
|
||||
}
|
||||
|
||||
return n_transformed > 0 ? STATUS_CMD_OK : STATUS_CMD_ERROR;
|
||||
}
|
||||
|
||||
|
||||
// `path filter`
|
||||
// All strings are taken to be filenames, and if they match the type/perms/etc (and exist!)
|
||||
// they are passed along.
|
||||
static int path_filter(parser_t &parser, io_streams_t &streams, int argc, const wchar_t **argv) {
|
||||
options_t opts;
|
||||
opts.type_valid = true;
|
||||
opts.perm_valid = true;
|
||||
int optind;
|
||||
int retval = parse_opts(&opts, &optind, argc, argv, parser, streams);
|
||||
if (retval != STATUS_CMD_OK) return retval;
|
||||
|
||||
int n_transformed = 0;
|
||||
arg_iterator_t aiter(argv, optind, streams, opts.null_in ? '\0' : '\n');
|
||||
while (const wcstring *arg = aiter.nextstr()) {
|
||||
if (filter_path(opts, *arg)) {
|
||||
// If we don't have filters, check if it exists.
|
||||
// (for match this is done by the glob already)
|
||||
if (!opts.have_type && !opts.have_perm) {
|
||||
if (waccess(*arg, F_OK)) continue;
|
||||
}
|
||||
|
||||
path_out(streams, opts, *arg);
|
||||
n_transformed++;
|
||||
if (opts.quiet) return STATUS_CMD_OK;
|
||||
}
|
||||
}
|
||||
|
||||
return n_transformed > 0 ? STATUS_CMD_OK : STATUS_CMD_ERROR;
|
||||
}
|
||||
|
||||
// Keep sorted alphabetically
|
||||
static constexpr const struct path_subcommand {
|
||||
const wchar_t *name;
|
||||
int (*handler)(parser_t &, io_streams_t &, int argc, //!OCLINT(unused param)
|
||||
const wchar_t **argv); //!OCLINT(unused param)
|
||||
} path_subcommands[] = {
|
||||
// TODO: Which operations do we want?
|
||||
// TODO: "base" or "basename"?
|
||||
{L"base", &path_base},
|
||||
{L"dir", &path_dir},
|
||||
{L"extension", &path_extension},
|
||||
{L"filter", &path_filter},
|
||||
{L"normalize", &path_normalize},
|
||||
{L"real", &path_real},
|
||||
{L"strip-extension", &path_strip_extension},
|
||||
};
|
||||
ASSERT_SORTED_BY_NAME(path_subcommands);
|
||||
|
||||
/// The string builtin, for manipulating strings.
|
||||
maybe_t<int> builtin_path(parser_t &parser, io_streams_t &streams, const wchar_t **argv) {
|
||||
const wchar_t *cmd = argv[0];
|
||||
int argc = builtin_count_args(argv);
|
||||
if (argc <= 1) {
|
||||
streams.err.append_format(BUILTIN_ERR_MISSING_SUBCMD, cmd);
|
||||
builtin_print_error_trailer(parser, streams.err, L"path");
|
||||
return STATUS_INVALID_ARGS;
|
||||
}
|
||||
|
||||
if (std::wcscmp(argv[1], L"-h") == 0 || std::wcscmp(argv[1], L"--help") == 0) {
|
||||
builtin_print_help(parser, streams, L"path");
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
|
||||
const wchar_t *subcmd_name = argv[1];
|
||||
const auto *subcmd = get_by_sorted_name(subcmd_name, path_subcommands);
|
||||
if (!subcmd) {
|
||||
streams.err.append_format(BUILTIN_ERR_INVALID_SUBCMD, cmd, subcmd_name);
|
||||
builtin_print_error_trailer(parser, streams.err, L"path");
|
||||
return STATUS_INVALID_ARGS;
|
||||
}
|
||||
|
||||
if (argc >= 3 && (std::wcscmp(argv[2], L"-h") == 0 || std::wcscmp(argv[2], L"--help") == 0)) {
|
||||
wcstring path_dash_subcommand = wcstring(argv[0]) + L"-" + subcmd_name;
|
||||
builtin_print_help(parser, streams, path_dash_subcommand.c_str());
|
||||
return STATUS_CMD_OK;
|
||||
}
|
||||
argc--;
|
||||
argv++;
|
||||
return subcmd->handler(parser, streams, argc, argv);
|
||||
}
|
||||
11
src/builtin_path.h
Normal file
11
src/builtin_path.h
Normal file
|
|
@ -0,0 +1,11 @@
|
|||
// Prototypes for functions for executing builtin_string functions.
|
||||
#ifndef FISH_BUILTIN_PATH_H
|
||||
#define FISH_BUILTIN_PATH_H
|
||||
|
||||
#include <cstring>
|
||||
#include <cwchar>
|
||||
|
||||
class parser_t;
|
||||
|
||||
maybe_t<int> builtin_path(parser_t &parser, io_streams_t &streams, const wchar_t **argv);
|
||||
#endif
|
||||
108
tests/checks/path.fish
Normal file
108
tests/checks/path.fish
Normal file
|
|
@ -0,0 +1,108 @@
|
|||
#RUN: %fish %s
|
||||
# The "path" builtin for dealing with paths
|
||||
|
||||
# Extension - for figuring out the file extension of a given path.
|
||||
path extension /
|
||||
or echo None
|
||||
# CHECK: None
|
||||
|
||||
# No extension
|
||||
path extension /.
|
||||
or echo Filename is just a dot, no extension
|
||||
# CHECK: Filename is just a dot, no extension
|
||||
|
||||
# No extension - ".foo" is the filename
|
||||
path extension /.foo
|
||||
or echo None again
|
||||
# CHECK: None again
|
||||
|
||||
path extension /foo
|
||||
or echo None once more
|
||||
# CHECK: None once more
|
||||
path extension /foo.txt
|
||||
and echo Success
|
||||
# CHECK: txt
|
||||
# CHECK: Success
|
||||
path extension /foo.txt/bar
|
||||
or echo Not even here
|
||||
# CHECK: Not even here
|
||||
path extension . ..
|
||||
or echo No extension
|
||||
# CHECK: No extension
|
||||
path extension ./foo.mp4
|
||||
# CHECK: mp4
|
||||
path extension ../banana
|
||||
# nothing, status 1
|
||||
echo $status
|
||||
# CHECK: 1
|
||||
path extension ~/.config
|
||||
# nothing, status 1
|
||||
echo $status
|
||||
# CHECK: 1
|
||||
path extension ~/.config.d
|
||||
# CHECK: d
|
||||
path extension ~/.config.
|
||||
echo $status
|
||||
# one empty line, status 0
|
||||
# CHECK:
|
||||
# CHECK: 0
|
||||
|
||||
path strip-extension ./foo.mp4
|
||||
# CHECK: ./foo
|
||||
path strip-extension ../banana
|
||||
# CHECK: ../banana
|
||||
# but status 1, because there was no extension.
|
||||
echo $status
|
||||
# CHECK: 1
|
||||
path strip-extension ~/.config
|
||||
# CHECK: {{.*}}/.config
|
||||
echo $status
|
||||
# CHECK: 1
|
||||
|
||||
path base ./foo.mp4
|
||||
# CHECK: foo.mp4
|
||||
path base ../banana
|
||||
# CHECK: banana
|
||||
path base /usr/bin/
|
||||
# CHECK: bin
|
||||
path dir ./foo.mp4
|
||||
# CHECK: .
|
||||
path base ../banana
|
||||
# CHECK: banana
|
||||
path base /usr/bin/
|
||||
# CHECK: bin
|
||||
|
||||
cd $TMPDIR
|
||||
mkdir -p bin
|
||||
touch bin/{bash,bssh,chsh,dash,fish,slsh,ssh,zsh}
|
||||
ln -s $TMPDIR/bin/bash bin/sh
|
||||
|
||||
chmod +x bin/*
|
||||
# We need files from here on
|
||||
path filter bin argagagji
|
||||
# The (hopefully) nonexistent argagagji is filtered implicitly:
|
||||
# CHECK: bin
|
||||
path filter --type file bin bin/fish
|
||||
# Only fish is a file
|
||||
# CHECK: bin/fish
|
||||
chmod 500 bin/fish
|
||||
path filter --type file,dir --perm exec,write bin/fish .
|
||||
# fish is a file, which passes, and executable, which passes,
|
||||
# but not writable, which fails.
|
||||
#
|
||||
# . is a directory and both writable and executable, typically.
|
||||
# So it passes.
|
||||
# CHECK: .
|
||||
|
||||
path normalize /usr/bin//../../etc/fish
|
||||
# The "//" is squashed and the ".." components neutralize the components before
|
||||
# CHECK: /etc/fish
|
||||
path normalize /bin//bash
|
||||
# The "//" is squashed, but /bin isn't resolved even if your system links it to /usr/bin.
|
||||
# CHECK: /bin/bash
|
||||
|
||||
# We need to remove the rest of the path because we have no idea what its value looks like.
|
||||
path real bin//sh | string match -r -- 'bin/bash$'
|
||||
# The "//" is squashed, and the symlink is resolved.
|
||||
# sh here is bash
|
||||
# CHECK: bin/bash
|
||||
Loading…
Reference in a new issue