test-complete.sh

#!/bin/sh

build_sort() {
	cat >sort.c <<\EOF &&
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

static int cmp(const void *a_, const void *b_)
{
	const char *a = *(const char **)a_;
	const char *b = *(const char **)b_;
	char *to_free_a = NULL, *to_free_b = NULL;
	int ret;

	a += !strncmp(a, "--no-", 5) ? 5 : 2;
	b += !strncmp(b, "--no-", 5) ? 5 : 2;
	if (a[strlen(a) - 1] == '=') {
		a = to_free_a = strdup(a);
		to_free_a[strlen(a) - 1] = '\0';
	}
	if (b[strlen(b) - 1] == '=') {
		b = to_free_b = strdup(b);
		to_free_b[strlen(b) - 1] = '\0';
	}
	//fprintf(stderr, "%s vs %s\n", a, b);
	ret = strcmp(a, b);
	free(to_free_a);
	free(to_free_b);
	return ret;
}

int main(int ac, char **av)
{
	char *lines[1024];
	int i, nr = 0;
	char buf[1024];

	while (fgets(buf, sizeof(buf), stdin)) {
		int len = strlen(buf);

		if (len && buf[len-1] == '\n')
			buf[len-1] = '\0';
		if (!strlen(buf))
			continue;
		lines[nr++] = strdup(buf);
	}

	qsort(lines, nr, sizeof(*lines), cmp);
	for (i = 0; i < nr; i++)
		puts(lines[i]);
	return 0;
}
EOF
	gcc -o complete-sort sort.c -Wall -g
}

complete ()
{
	# do nothing
	return 0
}


. ./contrib/completion/git-completion.bash

__gitcomp()
{
	echo "$*" | tr ' 	' '\n\n' | ./complete-sort | sed '/^$/d'
}

# We don't need this function to actually join words or do anything special.
# Also, it's cleaner to avoid touching bash's internal completion variables.
# So let's override it with a minimal version for testing purposes.
_get_comp_words_by_ref ()
{
	while [ $# -gt 0 ]; do
		case "$1" in
		cur)
			cur=${_words[_cword]}
			;;
		prev)
			prev=${_words[_cword-1]}
			;;
		words)
			words=("${_words[@]}")
			;;
		cword)
			cword=$_cword
			;;
		esac
		shift
	done
}

run_completion ()
{
	local -a COMPREPLY _words
	local _cword
	_words=( $1 )
	test "${1: -1}" = ' ' && _words[${#_words[@]}+1]=''
	(( _cword = ${#_words[@]} - 1 ))
	__git_wrap__git_main
}

test -x complete-sort || build_sort

export PATH=$(pwd):$PATH
while read cmd; do
    run_completion "git $cmd --" >output/git-${cmd/ /_}.txt
done <<\EOF
add
am
apply
branch
checkout
cherry-pick
clean
clone
commit
config
describe
difftool
fetch
fsck
gc
grep
help
init
ls-files
ls-remote
merge
merge-base
mv
name-rev
notes
notes add
notes append
notes copy
notes prune
push
remote
remote add
remote set-head
remote update
remote set-url
remote get-url
remote prune
replace
reset
revert
rm
show-branch
status
submodule add
submodule status
submodule deinit
submodule update
submodule summary
submodule foreach
submodule sync
tag
worktree add
worktree list
worktree lock
worktree move
worktree prune
worktree remove
EOF