With the previous fixes for #4273 and #4280 in place, it's now easy to
add support for subcommand aliases, which this commit does. This
addresses #4265 for Bash.
This continues the work started with the fix for #4273. There was
another bug caused by using the subcommand names without considering
their position in the argument list. If the user enters `git diff log
<TAB>`, we build up a string that identifies the subcommand. We ended
up making the string `git__diff__log` in this case because we appended
`__log` without considering the current state. Since `git__diff__log`
does not correspond to an actual command, we wouldn't provide any
suggestions.
This commit restructures the code so we walk subcommands and
subsubcommands in `bash.rs`. While walking those, we build up a list
containing triples of the parent `$cmd` name (e.g. `git__diff`), the
current command's name (e.g. `log`), and the `$cmd` for the current
command. We then build the shell script's case arms based on that
information.
We could instead have fixed#4280 by using the second element in the
pair returned from `utils::all_subcommands()` (a stringified list of
the subcommand path) instead of the first one. However, that would not
have helped us solve #4265.
Closes#4280
Early in the Bash-completion script, we build up a string that
identifies the command or subcommand. When we see the top-level
command's name (e.g. `git`) we set the command so far to that
value. We do that regardless of where in the argument list it
appears. For example, if the argument list is `git diff git`, we set
the current command to `git` when run into it the second time. We
therefore suggest arguments to the top-level command afterwards, which
is not correct.
This patch fixes that by also considering the string that identifies
the command so far, so we only set the overall command to `git` if the
command so far is the empty string.
This is actually just a step on the way to getting completion to work
for aliases of subcommands.
Closes#4273
There seems to be little reason to return early with an empty list
when there are no subcommands, instead of going through the loop 0
times and then returning the empty list.
The derive-based example has a `///` comment on one argument, which
ends up as a description for the argument in the generated completion
scripts. Let's switch to `//` so the two scripts produce the same
output (except for the binary name), so they're easy to compare.
The example binaries were renamed in 89c2b3bb0d, but the commands in
them were not, making the generated completion scripts not work
(because we use the command name as binary name in the examples).
Originally, clap carried a lifetime parameter. When moving away from
that, we took the approach that dynamically generated strings are always
supported and `&'static str` was just an optimization.
The problem is the code size increase from this is dramatic. So we're
taking the opposite approach and making dynamic formatting opt-in under
the `string` feature flag. When deciding on an implementation, I
favored the faster one rather than the one with smaller code size since
small code size can be gotten through other means.
Before: 567.2 KiB, 15.975 µs
After: 541.1 KiB, 9.7855 µs
With `string`: 576.6 KiB, 13.016 µs
This prevents global args from showing in help completions,
since help completions should only suggest subcommands.
Adds tests to ensure the args still show in the generated
help messages of subcommands.
* Copy hide flag
* Revert global args special handling. Another commit will
address the issue of whether global args should be included in
help subtrees.
Adds parser flags to toggle whether to run the
expensive clone logic for completions case.
Help completion will only suggest subcommands, not args.
clap_complete generator sets the flag.
