This allows us to check files without bringing them entirely into
memory. Also makes it easier to find the disorder in
(seq 9; echo 0) | sort --check
(points at the end of the file, where our previous version would
point at the start of the file)
Itertools' .coalesce() was the most useful helper that I could find
for comparing adjacent values in an iterator. It is designed for
implementing things like .dedup(), so the resulting code is a little
unintuitive.
FileMerger receives Lines Iterables of the pre-sorted input files
via push_file() It implements Iterator, which yields lines from the
input files in (merged) sorted order. If the input files are not sorted,
then the behavior is undefined.
Internally, FileMerger uses a
std::collections::BinaryHeap<MergeableFile>.
MergeableFile is an internal helper that implements Ord in a way that
BinaryHeap can use (note that we want smallest-first, but BinaryHeap
returns largest first, so MergeableFile::cmp() calls reverse() on
whatever compare_by() returns.
Made a new function sort_by(lines, compare_fns), which accepts a
list of compare_fns and calls lines.sort_by() with a closure that
calls each compare_fn in turn until one returns something other
than equal.
Default behavior ensures that String::cmp is the last element in the
compare_fns list (referred to as 'last resort' sorting by man sort).
Passing --stable (-s) turns this behaviour off.
Test cases provided for `sort --month` and `sort --month --stable`.
* Add options -c, -F, -L, -l, -r, -R, -S, -t, -U, --color
* Fix options -a, -A
* Remove unused options
* Output in columns when not using -l
* Output date with -l
The all flag did not cull/remove the directory entries starting with a
dot. The help message indicates it should. The implementation checks
if the string starts with a dot whilst also using '-a' to determine
whether a DirEntry is to be printed.
I forgot that -v refers to "verbose" and not "version"
when making earlier changes. So I fixed that and for
good measure added the verbose flag anyway.
* Added flag -t/--target-directory
* No longer assumes that the source arguments are files in the CWD (in other words, can copy files from directories other than CWD)
We now accept symbolic and numeric mode strings using the
--mode or -m option for install. This is used either when
moving files into a directory, or when creating component
directories with the -d option. This feature was designed
to mirror the GNU implementation, including the possibly
quirky behaviour of `install --mode=u+wx file dir`
resulting in dir/file having exactly permissions 0300.
Extensive integration tests are included.
This chnage required a higher libc dependency.
We check if the user has given one of the (many)
not yet implemented command line arguments. Upon
catching this, we display the specific transgressor
to stderr and exit with return code 2.
This behaviour is tested in one new integration test.
Bare minimum functionality of `install file dir` implemented.
Also added TODO markers in code for outstanding parameters
and split main function into smaller logical chunks.
Add install utility skeleton source, based on
mv, including the getopts setup mirroring
GNU's `man install` documentation. Also
add a single test and build system code.
