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26 commits

Author SHA1 Message Date
Johannes Altmanninger
7d5b44e828 Support FOO=bar syntax for passing variables to individual commands
This adds initial support for statements with prefixed variable assignments.
Statments like this are supported:

a=1 b=$a echo $b        # outputs 1

Just like in other shells, the left-hand side of each assignment must
be a valid variable identifier (no quoting/escaping).  Array indexing
(PATH[1]=/bin ls $PATH) is *not* yet supported, but can be added fairly
easily.

The right hand side may be any valid string token, like a command
substitution, or a brace expansion.

Since `a=* foo` is equivalent to `begin set -lx a *; foo; end`,
the assignment, like `set`, uses nullglob behavior, e.g. below command
can safely be used to check if a directory is empty.

x=/nothing/{,.}* test (count $x) -eq 0

Generic file completion is done after the equal sign, so for example
pressing tab after something like `HOME=/` completes files in the
root directory
Subcommand completion works, so something like
`GIT_DIR=repo.git and command git ` correctly calls git completions
(but the git completion does not use the variable as of now).

The variable assignment is highlighted like an argument.

Closes 
2019-11-25 09:20:51 +01:00
Johannes Altmanninger
a930cabb91 Update comment 2019-10-27 06:58:20 +01:00
ridiculousfish
82eca4bc86 Run clang-format on all files
The main change here is to reorder headers.
2019-10-13 15:50:48 -07:00
Fabian Homborg
c2970f9618 Reformat all files
This runs build_tools/style.fish, which runs clang-format on C++, fish_indent on fish and (new) black on python.

If anything is wrong with the formatting, we should fix the tools, but automated formatting is worth it.
2019-05-05 12:09:25 +02:00
Mahmoud Al-Qudsi
e0e0fe9dd3 Re-implement eval as a regular builtin
I did not realize builtins could safely call into the parser and inject
jobs during execution. This is much cleaner than hacking around the
required shape of a plain_statement.
2019-04-12 07:04:15 -05:00
Mahmoud Al-Qudsi
2fe2169065 Make eval a decorator
`eval` has always been implemented as a function, which was always a bit
of a hack that caused some issues such as triggering the creation of a
new scope. This turns `eval` into a decorator.

The scoping issues with eval prevented it from being usable to actually
implement other shell components in fish script, such as the problems
described in , which should now no longer be the case.

Closes .
2019-04-11 10:36:49 -05:00
Mahmoud Al-Qudsi
0bda853dc7 Add detection of eval to the parser
While `eval` is still a function, this paves the way for changing that
in the future, and lets the proc/exec functions detect when an eval is
used to allow/disallow certain behaviors and optimizations.
2019-04-10 21:19:57 -05:00
Aaron Gyes
11a1403219 Remove extra semicolons 2019-02-19 16:50:58 -08:00
Mahmoud Al-Qudsi
27cd74e16c Fix warning about extra ';' being ignored
It is both present at the end of the #define and explicitly included
after the define is called in the main code, leading to an expansion of
`;;`.
2018-06-18 00:05:31 -05:00
ridiculousfish
c7f16439bf Add support for ! as an analog to 'not'
! and not are effectively interchangeable now.
Mark them both as operators for syntax highlighting.
2018-03-05 14:04:49 -08:00
ridiculousfish
357d3b8c6d Rework 'and' and 'or' to be "job decorators"
This promotes "and" and "or" from a type of statement to "job
decorators," as a possible prefix on a job. The point is to rationalize
how they interact with && and ||.

In the new world 'and' and 'or' apply to a entire job conjunction, i.e.
they have "lower precedence." Example:

if [ $age -ge 0 ] && [ $age -le 18 ]
   or [ $age -ge 75 ] && [ $age -le 100 ]
   echo "Child or senior"
end
2018-03-05 13:41:36 -08:00
ridiculousfish
e1dafeab01 Add && and || support to the conditions of if and while
This updates the "boolean tail" feature of the if and while conditions
to know about job_conjunction, thereby respecting && and ||
2018-03-05 13:39:36 -08:00
ridiculousfish
8e9670ccd5 Implement execution of && and ||
This adds support for basic constructs. if and while is not yet
supported.
2018-03-05 12:20:56 -08:00
ridiculousfish
23d4f93556 Add && and || to fish grammar
This teaches the parser about && and ||, implemented via a new
production "job_conjunction".

These do not yet have execution support.
2018-03-05 12:20:56 -08:00
ridiculousfish
fd2a0dffa9 Reflect newlines after pipes in fish grammar
The previous attempt to support newlines after pipes changed the lexer to
swallow newlines after encountering a pipe. This has two problems that are
difficult to fix:

1. comments cannot be placed after the pipe
2. fish_indent won't know about the newlines, so it will erase them

Address these problems by removing the lexer behavior, and replacing it
with a new parser symbol "optional_newlines" allowing the newlines to be
reflected directly in the fish grammar.
2018-02-18 14:44:08 -08:00
ridiculousfish
9d48c68f24 Remove argument_or_redirection type
This was a symbol that represented either an argument or a redirection.
This was only used as part of argument_or_redirection_list.
It's simpler to just have these types be alternatives in the list type.
2018-01-22 13:18:34 -08:00
ridiculousfish
f81eef5ee1 Improve type checking of certain tnode_t interfaces 2018-01-22 13:13:28 -08:00
ridiculousfish
194f7f34d9 Eliminate parse_node_tree::find_nodes 2018-01-20 11:45:43 -08:00
ridiculousfish
b23c6ebcba Migrate run_block_statement to tnode_t 2018-01-20 11:45:43 -08:00
ridiculousfish
6f4db9f8ad Add type safety to tnode_t::try_get_child
Detect when no options in an alternation type match the requested type,
and ensure such cases do not compile.
2018-01-20 11:31:40 -08:00
ridiculousfish
f16ae9348f Continued adoption of tnode_t in complete.cpp and highlight.cpp 2018-01-20 11:31:40 -08:00
ridiculousfish
618996a166 Some adopton of tnode_t in complete.cpp 2018-01-20 11:31:40 -08:00
ridiculousfish
cfe355554c Adopt tnode in reader_expand_abbreviation_in_command 2018-01-20 11:31:40 -08:00
ridiculousfish
3d4dd4abef Introduce tnode 2018-01-20 11:31:40 -08:00
ridiculousfish
cf116e4880 Rejigger alts
Messing around
2018-01-20 11:31:40 -08:00
ridiculousfish
a012320a9a Add grammar in type system 2018-01-20 11:31:40 -08:00