This tried migrating old abbreviations *twice* - once from the 2.3
scheme to the 2.4 one, and once from that to the 3.0 scheme.
Since this is purely for upgrading from fishes < 3.0, and basically
untested, let's remove it.
If anyone does that upgrade, they'll simply have to reexecute the abbrs.
Because we reload changed function files, a common issue on upgrading
to 3.4.0 is that fish_title causes errors.
So we simply use the oldschool syntax.
* New -n flag for string join command.
This is an argument that excludes empty result items. Fixes#8351
* New documentation for string-join.
The new argument --no-empty was added at string-join manpage.
* New completions for the new -n flag for string join.
* Remove the documentation of the new -n flag of string join0
The reason to remove this new argument in the join0 is that this flag basically doesn't make any difference in the join0.
* Refactor the validation for the string join.
The string join command was using the length of the argument, this commit changes the validation to use the empty function.
* Revert #4b56ab452
The reason for the revert is thath the build broke on the ubuntu in the Github actions.
* Revert #e72e239a1
The reason the compilation on GitHub broke is that the test was weird, it didn't even run it, Common CI systems are typically very very resource-constrained.
* Resolve conflicts in the string-join.rst.
* Resolve conflicts in the "string-join.rst".
commit #1242d0fd7 not fixed all conflicts.
This was an oversight in 7fb3880b96, and would have spewed the existing rustup completions if this file was sourced twice (which probably won't happen given autoloading, to be fair).
I have no idea why this kept one component in the one case and none in
the other.
Because we already aggressively shorten the command, we can keep the directory.
Since the color previews are now wider, we had quite a wide range
where there would only be one. Remove the border around the content
earlier so windows with 1000px width still get two previews in a row.
(making the text shorter would also be an option here)
This makes the container fit the content, otherwise we'd be cutting
off the "> quack &" part of the first line.
Also while we're here increase the line-height a bit to give it more
breathing room, and increase the font size juuust a smidge.
Reduce margins and increase padding to make it less cramped.
Some GPG options work only with private keys but our completions suggest all
keys. Modify `__fish_complete_gpg_user_id and __fish_complete_gpg_key_id`
to take an optional argument for the "key type" to override `--list-keys`
with like `--list-secret-keys` for the appropriate options.
Closes#8712
Helm 3 provides an autogenerated completion since version 3.4.0.
The previous implementation is replaced by this because it was specific to the
now-deprecated helm 2.
The completions appear to be fully featured including descriptions and
completion for dynamic arguments such as namespaces and releases.
Their names are not perfect, so let's keep them as internal functions,
until we figure out how/if we want to expose this.
This reverts 0445126c2 (Undunder __fish_is_nth_token, 2021-06-29) (but I
did it without "git revert").
Closes#8008
This patch adds completions for the values of properties, emitted once the
current token matches the name of a zfs property in full, for the various places
where such a property can be assigned.
e.g.
zfs set canmoun<TAB> continues to only provide "canmount" as a completion, but
zfs set canmount<TAB> will provide a list of all valid values for the property.
The existing code made an attempt to complete the values for the specific case
of `zfs set PROP=` but I could never get it to work for me under FreeBSD, so I
presume it was Linux-specific. This patch should be cross-platform and extends
the completions to anywhere where a property may be set.
The previous behavior vs the current (hopefully ideal) behavior:
* zpool attach [lists pools and devices - should list only pools]
* zpool attach tank [lists pools and devices - should list only devices already
part of pool "tank"]
* zpool attach tank da1 [lists pools and devices - should list only devices not
already part of pool "tank" or any pool, depending on -f flag to attach]
Completions may benefit from using these in tandem to dynamically generate
completions predicated on the value of an earlier token in a cleaner fashion.
(Currently, most of called completion helper functions introspect the command
line to get the value of an earlier argument, making them less reusable for
different expressions that need completions of the same type. This way, the
completion can provide the function with the argument value explicitly.)
As of FreeBSD 13 (released April 2021), FreeBSD has rebased its zfs support on
top of the OpenZFS distribution previously used only/chiefly by Linux;
accordingly, it has gained support for some previously Linux-only completions.
This patch changes some completions previously predicated on a Linux ZFS
installation to the presence of an OpenZFS installation. Note that there
continue to be (and probably always will be) separate Linux-only and
FreeBSD-only completions (and not just when it comes to interacting with the
device subsystem, etc).
Cursory experiments reveal that there are only three color options where
the background color is not ignored (though I didn't check all of them).
For these three options, the foreground color is ignored. Similar for
bold/italics/underline.
Teach set completions to only show the colors that won't be ignored.
Unrelated observation: we write
-a '--background=(set_color --print-colors)'
instead of
-l background -a '(set_color --print-colors)'
because we want all colors to show straight away (there are no other
meaningful arguments).
4b018a760 (set completions: add more special variables, fix colors, 2021-12-13)
changed a global variable to a local, which is no longer visible to this
function. Fix this, so "set LANG <TAB>" works again.
We detect one terminal (foot) with a "string match" command, and all others in a long "test"
command. Let's put the detection of each terminal on a new line. This should be easier to read
and change. It also allows to lose one level of indentation.
This takes the changes from 03b23dd1b6
and applies them to the .theme version as well.
(note: It's *possible* to just go through fish_config in future, but
we do not want to do that right now because that can have issues on
upgrade)
This was an undocumented undunderscored function that wouldn't be
super useful to actually use manually (because it still checked if the
variable was set!). It also relied on `__init_uvar`, which was only
set in `__fish_config_interactive`.
Additionally it didn't remove any complexity because this was all very
simple "do thing a, do thing b, do thing c" stuff. It added a layer of
indirection instead, and made fish startup dependent on another
function.
If you want to reset your colorscheme to the default, use fish_config.
Add completions that are correct on darwin and probably bsd.
Add missing -H, -L, -P completions to GNU chown.
Remove errant GNU completion claiming -h is short for --help.
The regex for task names was a bit off, so
- include uppercase letters, to support `TMessagesProj:assembleMiniRelease`
- don't include characters like `[]` (which happen to lie between ASCII `A` and `z`)
- include numbers, which are presumably valid in an identifier
- explicitly include the optional ` - ` bit in the regex
- Use named colors instead of hex values - not sure how this
happened in the first place, these all map to basic named colors.
- Reinitialize if these were last set on fish <3.4, new variables
have been added.
- Break this into a separate function for the sake of
__fish_config_interactive complexity, and allow for running
manually.
Remove some nonexistent options (my gcc does not know "-mdata"), fix
the longest description in all of fish and remove some argument
markers from the option.
This sets the variable to the background value of
$fish_color_search_match, which fixes the case where you switch from a
theme with a set selected background (like our default, now) to one without.
It's using GNU specific flags, which doesn't work on BSDs like macOS.
Instead this just formats the current time into
seconds and then the `math` builtin for calculating the 5 min timeout.
Unfortunately the normal font families like "sans-serif" and
"monospace" are basically broken because the browser defaults are
decades old.
TODO: Inline code is barely distinguishable.
GNU tr is not Unicode-aware, and was corrupting descriptions that had
non-ASCII characters.
Additionally, rather than using the Unicode private use characters, use
the ASCII/UTF-8 record separator character as it was intended.
The sed command could probably be rewritten to do all the heavy lifting
here, but would be even less readable.
Closes#8575.
Instead of weirdly smearing the color, simply increase the values
until they are bright enough.
This prevents /tmp from being white, and guarantees visible colors for
all directories.
fish_git_prompt may run certain git commands which may invoke certain
external programs as specified `.git/config`. Prevent this by suppressing
certain git config options.
The `name` attribute I used in commit f725cd402d
is undocumented, and [someone discovered] that it does not exist for one
possible browser on MacOS. This should make the code work correctly even in that case.
This probably doesn't currently cause a problem, at least when
`isMacOS10_12_5_OrLater()` is true, because of the ordering of the if
statements in the `runThing` function.
[someone discovered]: https://bugs.python.org/issue43424#msg409087
Git completions use wrapper function __fish_git instead of directly
running git. This allows them to be aware of Git's global options, like
--git-dir. Let's use __fish_git also for listing config keys & values,
so it can more accurately list local (= per repo) git configuration.
We don't provide completions on "git config " because we require
"fish_is_nth_token 3". Confusingly, fish_is_nth_token only counts
tokens *before* the cursor, so 2 is the right number here.
While at it, fix a typo and delete an unused completion entry (it
ran conditional on __fish_is_first_arg, which is always false for a
git subcommand).
This patch introduces basic completion of the -pl|--projects switch for
mvn. The implementation is quite naive but it's better than nothing. A more
robust implementation would require either scanning the filesystem or running
mvn which might slow down completion significantly.
This solution can be improved by using an XML parser instead of grep/sed.
This is a stop gap. Ideally setting a theme would be idempotent. You
set it, all colors change to match it, even the ones it does not
specify.
However, I do not believe we can *erase* colors that aren't set, and
we don't currently do so in the CLI version. So skip setting these at
all, for now.
If a color is mentioned but empty, it will be set to empty.
If the theme says "brgreen", that's what we want the variable to say
after.
This used to translate it through our palette, so it ended up as
00ff00, which isn't the same.
This still keeps the idea that colors that aren't in the palette are
better, and it does it in a slightly roundabout way (translate color
string to rgb string, see if the rgb string is a key in that
translation dictionary), but it should work for now.
* add --bold, --italics, all of them,
* and we add them as arguments so that they are do not
render like long options, they are just self-descriptive
literal strings in this context.
* solve an unneccessary global var.
Fixes#8518
Theoretically if this only includes simple characters, it won't cause
any issues. We already validate in other places but it doesn't hurt to
do this twice.
Now that we have modifiers and can have backgrounds and such, simply
setting it as css style doesn't cut it.
So let's stop validating for now, the worst that can happen is that
the color isn't rendered.
This just simply passed the "color" value, which is just the
foreground color string.
Instead, we pass the actual object back, with the modifiers as bools
and foreground/background separate.
Our themes don't use background a lot, except in the pager, so this
never really came up.
Use the remaining_to_disclose count to determine if all completions
are shown (allows consistent behavior between short and long completion
lists).
Closes#8485
Cargo subcommand extensions don't provide a description in `cargo --list`,
the regex used to filter this list ignored lines without a description.
This change fixes that.
A completion entry like «complete -a '\\~'» results in completions
that insert \~ into the command line. However we usually want to
insert ~, but there is no way to do that.
There are a couple of longstanding issues about completion escaping
[1]. Until we fix those in a general way, fix the common case by
never escaping tildes when applying custom completions to the command
line. This is a hack but will probably work out fine because we don't
expect literal tildes in arguments.
The tilde is included in completions for cdh, or
__fish_complete_suffix, which simply forwards results from "complete
-C". Revert a workaround to cdh that expanded ~, because we can now
render that without escaping.
Closes#4570, #8441
[ja: tweak patch and commit message]
[1]: https://github.com/fish-shell/fish-shell/pull/8441#discussion_r748803338
* Rename pabcnetcclear complete
* Code clean-up
* Debug values support
* Change /Debug description
* Standardize help
* Use single quotes for --arguments
We only need the curses module to look up sgr0, bold and underline
sequences.
Since those are going to be the xterm versions 90% of the time, we can
simply use those if this fails.
Fixes#8487.
* Add findstr completion
* Standardize completion
* Show completion only on Windows
* Use single quotes where possible
* Remove quotes where possible
* Remove OS check
* Use single quotes for --arguments
This looked at __fish_print_commands, which goes via our man pages to
find the commands (it shouldn't, buuut), and exludes a hard-coded list
of pages.
So we do two thigns:
1. We add the other doc pages to the list
2. We check commands *later* - if we listed something explicitly it
should be used
This was "--authoritative" (and unauthoritative). It was meant to make
fish mark everything that couldn't be generated via the completions as
an error, it was removed years ago and has been a no-op since then.
This behavior matches the way completions are found for `cargo run`,
`cargo test`, etc., and is more robust and correct compared to looking
at filenames.
This was supposed to act like `type -q` or `command -q`, in that it
returns 0 if at least 1 exists.
But because it used the wrong variable it didn't.
Fixes#8431.
Foot has several terminfos:
* foot - the default one
* foot-direct - 24-bit color terminfo, similar to xterm-direct (used by e.g. emacs)
* foot-extra - alternative to the ncurses provided terminfo, with a couple of extra, non-standard
capabilities
* foot-extra-direct - 24-bit color version of the above
There may also be other distro-custom terminfo names (serving the same purpose as foot-extra*)
Otherwise, with a light-theme, the selected entry uses black text with
"bright black" background, which can be low contrast thus hard to read.
The description background is different, maybe we can fix that later.
See #8376
This is nroff/groff being broken. It turns "→" into "â". This is even if we select `-Tutf8` and friends.
So, if mandoc exists, we prefer that, and otherwise, run preconv on
the file first (if it exists).
Really, what we would need to to is tell nroff to pass `-KUTF-8` to
groff, but that doesn't appear to be possible.
- Introduce BUILTIN_ERR_COMBO2_EXCLUSIVE
- Distill generally more terse, unambiguous error descriptions.
Remember English is not everyone's language.
- Do not capitalize sentence fragments
- Use the modality where problem input is in a %s: prefix, then
is explained.
- Do not address the user (the "You cannot do ..." kraderism)
- Spell out 'arguments' rather than 'args' for consistency
- Mention 'function' as a scope
This basically disables syntax highlighting. That doesn't mean we use
absolutely no colors - the search match, suggestion, selection and the
pager have coloring, but only reverse or brblack.
The idea is that this disables anything that tells you about
the *syntax*, but it still tells you about the state of the
commandline. If we didn't highlight the selection it would be entirely
invisible, and if we didn't highlight the suggestion you would have no
idea where it begins.
So this basically brings colors on-par with bash, where the search
match is colored (in reverse) and suggestions aren't a thing.
An alternative is to add a $fish_highlighting_enabled variable like
the one for suggestions. That's still possible, but would require some
internal changes to avoid coloring some things with $fish_color_normal
and other things with the normal terminal color.
One thing this also does not do is set the git prompt colors. These
are currently disallowed from being set in theme files because they
start with `__fish` instead of just `fish`. We should probably rename
them.
This program uses the Cobra framework for argument parsing and completion generation.
Just source the completions supplied by upstream.
This works around "go install" not being able to install completions files (only binaries).
Usually local branches have remote branches with the same name, and in
completion they are currently overshadowed by unique remote branches, making
local branches hard to find. Define local branch completion after unique
remote branch completion to show local branches before unique remote branches.
If $xdg_chache_home is empty, this is not a valid fish expression:
[ \( -z \) -o \( ! -d \) ]
and results into an error.
While at it, also use $XDG_CACHE_HOME if that directory does not exist.
This seems better than falling back to $HOME/.cache, which the user has
explicitly overridden via $XDG_CACHE_HOME.
In 'simple terminal' the delete key prints \e[P by default, which is
related to the different approach the authors of st are taking on the
matter of shell configuration. The main problem is the malfunction of
the delete key, so we have to use a workaround like this.
Suggest files to "man -l", but only if the "-l" option is supported
(so not on BSD). Technically we should accept multiple files but this
seems good enough.
Also suggest files when the token-at-cursor contains a slash, because
man will treat arguments as file paths if they contain a /.
git-status --porcelain prints status letter T when a file changed type
between either regular file, symlink or submodule. It can occur in
exactly the same cases as M (modified), so extend the fix for #8311
accordingly.
For submodules, our completions are probably not always correct,
hopefully those cases are rare.
This is weirdly undocumented (as of git 2.33.0), but `git status` prints a "T" state if
the file has its "T"ype changed, e.g. from a regular file to a symlink.
For our purposes that's just another kind of modification.
Fixes#8311.
* Hide whatis database building from the user
It's really an internal detail, but shows up in prompts that display how many
background jobs are running.
By disowning it keeps running but won't show up in `jobs` or get killed if the user
exits the shell.
* Update __fish_apropos.fish
The less -F / --quit-if-one-screen option is buggy before v530. To work
around this, pass --no-init less versions older than 530.
The --no-init option was previously passed; it was removed in d15a51897d
for mouse support. Unfortunately it looks like we can't have mouse
support and --quit-if-one-screen on macOS shipped less (version 487).
It's worth fixing this because otherwise history and help is just not
printed on stock macOS.
Relevant is https://unix.stackexchange.com/questions/107315/less-quit-if-one-screen-without-no-initFixes#8157.
Commit c3374ffd0 ("Use read --tokenize instead of eval for $BROWSER &
$EDITOR") converted uses of "eval" for environment variables to use the
safer "read -at", which performs word splitting but no other expansion.
funced contained a leftover instance of "eval". Remove it in favor
of using the editor command that was already word-split.
This means that we don't accidentally evaluate the file name.
(Also "set -gx EDITOR=~/my-editor" won't work anymore because the ~
is not expanded anymore but no one has complained about that behavior
in edit_command_buffer.)
Fixes#8289
*Problem:*
edit_command_buffer uses `cat` to return the modified content.
If a person has an alias for `cat` to a different command such `bat`** the editing will not be useful anymore since bat decorates the text with frames, line counts, etc
*Solution*
Appending command to cat, fish will ignore the alias and execute the real command according to this https://fishshell.com/docs/current/cmds/command.html
** https://github.com/sharkdp/bat
* Fix ls.fish: add -l option to GNU ls
* Sort alphabetically and remove --lcontext and --scontext (what are these?) on shared and GNU part.
* Revert --lcontext and --scontext options.
This should add all the sections that aren't linked internally,
including "identifiers".
(also give up on the line breaking because it makes it annoying to do
automatically)
Fixes#8245.
This was semi-automated with
```fish
for file in $argv
set -l varname (string replace -r '.*/(.*).html' '$1' -- $file | string escape --style=var)pages
set -l sections (string replace -rf '.*class="headerlink" href="#([^"]*)".*' '$1' <$file)
echo set -l $varname $sections
end
```
(where $argv contains the path to faq, fish_for_bash_users,
interactive, language and tutorial.html)
Building help.fish at compile time would work, but only for users who
build the docs.
The same hack that is used for `pkg remove <foo>` is required here, too.
Due to the massive number of results, we use `head -n 250` to prevent
the completion from hanging or the shell from being overencumbered by
too many possibe completions. However, this would only generate matches
for any of the first 250 packages, rather than printing the first 250
packages that match.
[ci skip]
As functions know where they are loaded from now, there is no point in
them being marked as loaded from a temporary file that has been removed.
Source the function via a redirect instead.
support for ping from iputils (version 20210202)
support for ping from inetutils (version 2.1)
support for ping from busybox (version 1.33.1)
support for ping from FreeBSD and macOS (by @juntuu)
Ubuntu's fish package on WSL 1 has xsel as recommended dependency,
even though there is no X server available. This change makes us
use Windows' native clipboard even when xsel is installed.
We keep __fish_is_nth_token for compatibility and edit the
implementations of __fish_is_nth_token, __fish_is_first_token and
__fish_is_token_n to use fish_is_nth_token
Using `complete -F -c git -n __fish_git_needs_subcommand -a $command -d
$description` causes file completions to be forced on entire git command
which is not a desired result. Morever without the `-F` flag file
completions work just as expected and is useless addition
This injected filenames into fish script, which could inject things
that looked like fish script.
E.g. create a file called `~/.config/fish/themes/"; rm -rf ~/*"`.
Note that the prompts are all shipped by us, but the themes can
technically be added by the user, and they might not be dilligent in
what filenames they allow.
`fish_config theme`:
- `list` to list all available themes (files in the two theme
directories - either the web_config/themes one or
~/.config/fish/themes!)
- `show` to show select (or all) themes right in the terminal - this
starts another fish that reads the theme file and prints the sample
text, manually colored
- `choose` to load a theme *now*, setting the variables globally
- `save` to load a theme and save the variables universally
- `dump` to write the current theme in .theme format (to stdout)
- `demo` to display the current theme
In the variable handler, we just go through the entire thing and keep
every element once.
If there's a duplicate, we set it again, which calls the handler
again.
This takes a bit of time, to be paid on each startup. On my system,
with 100 already deduplicated elements, that's about 4ms (compared to
~17ms for adding them to $PATH).
It's also semantically more complicated - now this variable
specifically is deduplicated? Do we just want "unique" variables that
can't have duplicates?
However: This entirely removes the pathological case of appending to
$fish_user_paths in config.fish (which should be an FAQ entry!), and the implementation is quite simple.
* Add initial completion for Angular CLI
* Remove completion for `ng completion`
The `ng completion` doesn't exist. The completiond were autogenerated
using a script. See angular/angular-cli#21085
* Use shorter wording
* Fix typos
These are simple
var val [val val]
files. Basically the bit in `set -g fish_color_escape 86c1b9` after
the `set -g `. Since we're not going to `source` them, however,
arbitrary code and expansions are unsupported.
Also comments and such don't currently work.
This allows them to be easily readable both from webconfig (next
commit) and the shell (later).
This used to pass each color in a separate url-encoded request, which is
just wasteful.
Also it passed separate parameters for modifiers like bold and
underlined, but never gave them actual values. Instead the color is
passed as one string.
So we just use json, and then iterate over it server-side.
This introduces two functions to
- toggle a process prefix, used for adding "sudo"
- add a job suffix, used for adding "&| less"
Not sure if they are very useful; we'll see.
Closes#7905
I almost always use this on the last/only job in a commandline, so
the semicolon is usually not needed. We have always added it but I
prefer not dropping it: this feels cleaner because it's what you'd
type without the shortcut.
Similarly to b0e3cc4b5 (__fish_complete_suffix: Remove `eval`,
2019-12-28), this use of eval is unsafe and can spew errors if
invoked on an incomplete brace expansion.
Commit d15a51897 ("Rationalize $LESS uses") switched a "less" flag
from -r (interpret all control characters)
to -R (interpret only color codes)
Somehow this changed the output of "fish -c 'command -h'" to include
weird characters:
DESCRIPTION^O
command^O forces the shell to execute the program COMMANDNAME^O and ignore any functions or builtins with the same name.
Probably this was the reason why I originally used -r over -R. Anyway,
-R is safer and it looks like we can just remove the "ul" preprocessing
since "less" will interpret bold/underline just fine.
The `__fish_git_unique_remote_branches` function isn't applicable here
since `git describe` won't know what to do with a remote branch without
the remote prefix. For example, if there is a branch called
`origin/my-branch`, you can't execute `git describe my-branch` until the
branch is checked out locally. In other words:
Good: `git describe origin/my-branch`
Bad: `git describe my-branch`
Good: `git switch my-branch; git describe my-branch`
The completions for the `--example` option are generated using `find`.
The `find` utility on macOS will produce the following output when the
path argument has a trailing slash:
```
~/bat $ find ./examples/
./examples/
./examples//cat.rs
./examples//advanced.rs
./examples//simple.rs
./examples//list_syntaxes_and_themes.rs
./examples//yaml.rs
```
And will produce this output if the path does NOT have a trailing slash:
```
~/bat $ find ./examples
./examples
./examples/cat.rs
./examples/advanced.rs
./examples/simple.rs
./examples/list_syntaxes_and_themes.rs
./examples/yaml.rs
```
The extra slash after `examples` ends up in the completion suggestions
which is incorrect:
```
~/bat $ cargo run --example <TAB>
/advanced /cat /list_syntaxes_and_themes /simple /yaml
```
Unlike on my Linux box where `find` doesn't output the trailing slash:
```
~/bat $ cargo run --example <TAB>
advanced cat inputs list_syntaxes_and_themes simple yaml
```
Importantly, I get the same (correct) output on Linux even without the
trailing slash in the path argument to `find`.
This can give false positives but only if used on directories that
mix tracked and untracked files. The performance is better than
listing all tracked files, and in any case we're pretty far from a
correct solution that knows the target Git commit, so this seems like
good compromise.
The buttons were already supposed to highlight on hover, but the color
difference was barely visible. Crank that up.
Also add a hover color to the tabs, colorschemes, prompts, functions.
The big clickable things.
This made the current prompt appear directly under the tab,
disregarding the padding.
That means it looked inconsistent with the colors. (note there's still
less padding on the side, but at least that allows more actual content
- prompts are often fairly wide)
This has one slight behavioral change: Even with xsel, it now copies
to the clipboard, not the primary. I would imagine anyone who cares
about the primary selection has customized fish_clipboard_copy and
because we never got a bug about this not supporting anything but
xsel (and errorring out if it's not available!) this is probably
unused.
So now we support all the clipboard integration things, and we use the clipboard.
This change adds a binding that sets the s key's behaviour to match
the c key's in visual mode. This mirrors vim's behaviour (see `:h v_s`
in vim or neovim).
Apart from OpenBSD's "colorls" that is basically an ls that can do
color, there's also a ruby tool called "colorls" that's closer to exa.
Ignore that one since the options it understands are quite different
and I'm betting it's slower (given my experience with ruby tools).
See #8042.
* add support for colorized ls on openbsd
* add changelog line for colorls support
* add readme line for colorls support
* determine ls command at runtime, don't cache it
* eliminate __fish_ls_command function
