Run git-completion.bash

[andychu]

This is a big ambitious issue. Not sure what is necessary, but help appreciated.

https://github.com/git/git/blob/master/contrib/completion/git-completion.bash

This is 3000+ lines of code that you probably don't want to rewrite in a different completion system!

What do zsh and fish do?

[andychu]

NOTE: It doesn't even parse under OSH because it has zsh code in it! bash doesn't parse this statically, so it gives no errors.

for c in ${=1}; do

However, it says that part is obsolete, and git-completion.zsh is the replacement.

[andychu]

NOTE: osh now parses a line at a time because alias requires this. So the zsh thing is no longer an issue.

However osh -n still retains the capability of static parsing, without alias expansion.

[andychu]

The number of flags here is pretty small actually:

~/git/oilshell/oil$ grep -w -E 'compgen|compopt|complete' testdata/completion/git-completion.bash 
        # re-assemble words to complete.
# 1: List of newline-separated matching completion words, complete with
        unset $(compgen -v __gitcomp_builtin_)
# 1: List of newline-separated matching paths, complete with all prefix
        compopt -o filenames +o nospace 2>/dev/null ||
        compgen -f /non-existing-dir/ >/dev/null ||
# Generates completion reply with compgen from newline-separated possible
        compopt -o filenames +o nospace 2>/dev/null ||
        compgen -f /non-existing-dir/ >/dev/null ||
                # this command does not take a ref, do not complete it
                                __gitcomp "$(git --list-cmds=list-mainporcelain,others,nohelpers,alias,list-complete,config)"
        complete -o bashdefault -o default -o nospace -F $wrapper $1 2>/dev/null \
                || complete -o default -o nospace -F $wrapper $1

[andychu]

COMP_ variables:

$ grep COMP_ git-completion.bash 
case "$COMP_WORDBREAKS" in
*)   COMP_WORDBREAKS="$COMP_WORDBREAKS:"
# word completion separators (COMP_WORDBREAKS) to treat as ordinary
# COMP_WORDBREAKS to exclude those characters.  The intent is to
# It is best not to set COMP_WORDBREAKS directly because the value is
# function gets called, COMP_WORDS has already been populated so local
# changes to COMP_WORDBREAKS have no effect.
        exclude="${1//[^$COMP_WORDBREAKS]}"
        cword_=$COMP_CWORD
                words_=("${COMP_WORDS[@]}")
        for ((i=0, j=0; i < ${#COMP_WORDS[@]}; i++, j++)); do
                        [ -n "${COMP_WORDS[$i]}" ] &&
                        [ "${COMP_WORDS[$i]//[^$exclude]}" = "${COMP_WORDS[$i]}" ]
                        words_[$j]=${words_[j]}${COMP_WORDS[i]}
                        if [ $i = $COMP_CWORD ]; then
                        if (($i < ${#COMP_WORDS[@]} - 1)); then
                words_[$j]=${words_[j]}${COMP_WORDS[i]}
                if [ $i = $COMP_CWORD ]; then
                case "$COMP_WORDBREAKS" in
                case "$COMP_WORDBREAKS" in

[andychu]

This is done, or at least I haven't noticed any bugs running it lately.

We can also run git-prompt.sh