Some distros (Arch) use python command for Python 3, so we need to update the scripts to work with it. We cannot just switch to python3 command because MacOS does not ship it.
1. Added missing commands and arguments.
2. Removed alternative spelling of some commands (e.g. clear-cache|clearcache) since a choice of spelling is not really useful for completion.
3. Fixed a typo: np-ansi → no-ansi.
4. Removed redundant backslash in front of $COMPOSER_HOME.
The updated completion was initially generated using the bamarni/symfony-console-autocomplete package and then incorporated into the existing code.
This patch adds completion for the update subcommand, that is, when the
user types in `composer update <tab>`.
The code depends on python for the json parsing. I'm not sure if this
is appropriate or if there is a fish-native way to parse json data.
Use suggestions for remove subcommand.
Add suggestions for why, why-not and depends.
Add why/why-not suggestion.
This is already done by fish before calling the completion.
It breaks completion with combiners (#2025) and also with wrappers.
(This does not include git because that's better solved in #2145)
