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completion: don't use __gitdir() for git commands
Several completion functions contain the following pattern to run git commands respecting the path to the repository specified on the command line: git --git-dir="$(__gitdir)" <cmd> <options> This imposes the overhead of fork()ing a subshell for the command substitution and potentially fork()+exec()ing 'git rev-parse' inside __gitdir(). Now, if neither '--gitdir=<path>' nor '-C <path>' options are specified on the command line, then those git commands are perfectly capable to discover the repository on their own. If either one or both of those options are specified on the command line, then, again, the git commands could discover the repository, if we pass them all of those options from the command line. This means we don't have to run __gitdir() at all for git commands and can spare its fork()+exec() overhead. Use Bash parameter expansions to check the $__git_dir variable and $__git_C_args array and to assemble the appropriate '--git-dir=<path>' and '-C <path>' options if either one or both are present on the command line. These parameter expansions are, however, rather long, so instead of changing all git executions and make already long lines even longer, encapsulate running git with '--git-dir=<path> -C <path>' options into the new __git() wrapper function. Furthermore, this wrapper function will also enable us to silence error messages from git commands uniformly in one place in a later commit. There's one tricky case, though: in __git_refs() local refs are listed with 'git for-each-ref', where "local" is not necessarily the repository we are currently in, but it might mean a remote repository in the filesystem (e.g. listing refs for 'git fetch /some/other/repo <TAB>'). Use one-shot variable assignment to override $__git_dir with the path of the repository where the refs should come from. Although one-shot variable assignments in front of shell functions are to be avoided in our scripts in general, in the Bash completion script we can do that safely. Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -61,6 +61,14 @@ __gitdir ()
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fi
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}
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# Runs git with all the options given as argument, respecting any
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# '--git-dir=<path>' and '-C <path>' options present on the command line
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__git ()
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{
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git ${__git_C_args:+"${__git_C_args[@]}"} \
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${__git_dir:+--git-dir="$__git_dir"} "$@"
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}
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# The following function is based on code from:
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#
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# bash_completion - programmable completion functions for bash 3.2+
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@ -287,13 +295,11 @@ __gitcomp_file ()
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# argument, and using the options specified in the second argument.
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__git_ls_files_helper ()
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{
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local dir="$(__gitdir)"
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if [ "$2" == "--committable" ]; then
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git ${__git_C_args:+"${__git_C_args[@]}"} --git-dir="$dir" -C "$1" diff-index --name-only --relative HEAD
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__git -C "$1" diff-index --name-only --relative HEAD
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else
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# NOTE: $2 is not quoted in order to support multiple options
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git ${__git_C_args:+"${__git_C_args[@]}"} --git-dir="$dir" -C "$1" ls-files --exclude-standard $2
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__git -C "$1" ls-files --exclude-standard $2
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fi 2>/dev/null
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}
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@ -323,8 +329,7 @@ __git_heads ()
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{
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local dir="$(__gitdir)"
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if [ -d "$dir" ]; then
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git --git-dir="$dir" for-each-ref --format='%(refname:short)' \
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refs/heads
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__git for-each-ref --format='%(refname:short)' refs/heads
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return
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fi
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}
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@ -333,8 +338,7 @@ __git_tags ()
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{
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local dir="$(__gitdir)"
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if [ -d "$dir" ]; then
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git --git-dir="$dir" for-each-ref --format='%(refname:short)' \
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refs/tags
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__git for-each-ref --format='%(refname:short)' refs/tags
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return
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fi
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}
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@ -385,14 +389,14 @@ __git_refs ()
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refs="refs/tags refs/heads refs/remotes"
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;;
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esac
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git --git-dir="$dir" for-each-ref --format="$pfx%($format)" \
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__git_dir="$dir" __git for-each-ref --format="$pfx%($format)" \
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$refs
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if [ -n "$track" ]; then
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# employ the heuristic used by git checkout
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# Try to find a remote branch that matches the completion word
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# but only output if the branch name is unique
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local ref entry
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git --git-dir="$dir" for-each-ref --shell --format="ref=%(refname:short)" \
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__git for-each-ref --shell --format="ref=%(refname:short)" \
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"refs/remotes/" | \
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while read -r entry; do
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eval "$entry"
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@ -406,7 +410,7 @@ __git_refs ()
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fi
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case "$cur" in
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refs|refs/*)
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git --git-dir="$dir" ls-remote "$remote" "$cur*" 2>/dev/null | \
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__git ls-remote "$remote" "$cur*" 2>/dev/null | \
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while read -r hash i; do
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case "$i" in
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*^{}) ;;
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@ -417,10 +421,10 @@ __git_refs ()
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*)
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if [ "$list_refs_from" = remote ]; then
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echo "HEAD"
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git --git-dir="$dir" for-each-ref --format="%(refname:short)" \
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__git for-each-ref --format="%(refname:short)" \
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"refs/remotes/$remote/" 2>/dev/null | sed -e "s#^$remote/##"
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else
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git --git-dir="$dir" ls-remote "$remote" HEAD \
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__git ls-remote "$remote" HEAD \
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"refs/tags/*" "refs/heads/*" "refs/remotes/*" 2>/dev/null |
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while read -r hash i; do
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case "$i" in
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@ -447,7 +451,7 @@ __git_refs2 ()
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__git_refs_remotes ()
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{
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local i hash
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git --git-dir="$(__gitdir)" ls-remote "$1" 'refs/heads/*' 2>/dev/null | \
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__git ls-remote "$1" 'refs/heads/*' 2>/dev/null | \
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while read -r hash i; do
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echo "$i:refs/remotes/$1/${i#refs/heads/}"
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done
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@ -457,7 +461,7 @@ __git_remotes ()
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{
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local d="$(__gitdir)"
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test -d "$d/remotes" && ls -1 "$d/remotes"
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git --git-dir="$d" remote
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__git remote
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}
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# Returns true if $1 matches the name of a configured remote, false otherwise.
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@ -523,7 +527,7 @@ __git_complete_revlist_file ()
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*) pfx="$ref:$pfx" ;;
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esac
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__gitcomp_nl "$(git ${__git_C_args:+"${__git_C_args[@]}"} --git-dir="$(__gitdir)" ls-tree "$ls" 2>/dev/null \
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__gitcomp_nl "$(__git ls-tree "$ls" 2>/dev/null \
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| sed '/^100... blob /{
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s,^.* ,,
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s,$, ,
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@ -801,7 +805,7 @@ __git_compute_porcelain_commands ()
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__git_get_config_variables ()
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{
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local section="$1" i IFS=$'\n'
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for i in $(git --git-dir="$(__gitdir)" config --name-only --get-regexp "^$section\..*" 2>/dev/null); do
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for i in $(__git config --name-only --get-regexp "^$section\..*" 2>/dev/null); do
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echo "${i#$section.}"
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done
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}
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@ -819,8 +823,7 @@ __git_aliases ()
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# __git_aliased_command requires 1 argument
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__git_aliased_command ()
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{
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local word cmdline=$(git --git-dir="$(__gitdir)" \
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config --get "alias.$1" 2>/dev/null)
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local word cmdline=$(__git config --get "alias.$1" 2>/dev/null)
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for word in $cmdline; do
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case "$word" in
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\!gitk|gitk)
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@ -896,7 +899,7 @@ __git_get_option_value ()
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done
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if [ -n "$config_key" ] && [ -z "$result" ]; then
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result="$(git --git-dir="$(__gitdir)" config "$config_key")"
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result="$(__git config "$config_key")"
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fi
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echo "$result"
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@ -1237,7 +1240,7 @@ _git_commit ()
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return
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esac
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if git --git-dir="$(__gitdir)" rev-parse --verify --quiet HEAD >/dev/null; then
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if __git rev-parse --verify --quiet HEAD >/dev/null; then
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__git_complete_index_file "--committable"
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else
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# This is the first commit
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@ -1839,7 +1842,7 @@ _git_send_email ()
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case "$prev" in
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--to|--cc|--bcc|--from)
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__gitcomp "
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$(git --git-dir="$(__gitdir)" send-email --dump-aliases 2>/dev/null)
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$(__git send-email --dump-aliases 2>/dev/null)
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"
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return
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;;
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@ -1871,7 +1874,7 @@ _git_send_email ()
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;;
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--to=*|--cc=*|--bcc=*|--from=*)
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__gitcomp "
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$(git --git-dir="$(__gitdir)" send-email --dump-aliases 2>/dev/null)
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$(__git send-email --dump-aliases 2>/dev/null)
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" "" "${cur#--*=}"
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return
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;;
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@ -1966,7 +1969,7 @@ __git_config_get_set_variables ()
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c=$((--c))
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done
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git --git-dir="$(__gitdir)" config $config_file --name-only --list 2>/dev/null
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__git config $config_file --name-only --list 2>/dev/null
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}
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_git_config ()
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remote.*.push)
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local remote="${prev#remote.}"
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remote="${remote%.push}"
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__gitcomp_nl "$(git --git-dir="$(__gitdir)" \
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for-each-ref --format='%(refname):%(refname)' \
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refs/heads)"
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__gitcomp_nl "$(__git for-each-ref
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--format='%(refname):%(refname)' refs/heads)"
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return
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;;
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pull.twohead|pull.octopus)
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@ -2591,12 +2593,12 @@ _git_stash ()
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if [ $cword -eq 3 ]; then
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__gitcomp_nl "$(__git_refs)";
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else
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__gitcomp_nl "$(git --git-dir="$(__gitdir)" stash list \
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__gitcomp_nl "$(__git stash list \
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| sed -n -e 's/:.*//p')"
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fi
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;;
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show,*|apply,*|drop,*|pop,*)
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__gitcomp_nl "$(git --git-dir="$(__gitdir)" stash list \
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__gitcomp_nl "$(__git stash list \
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| sed -n -e 's/:.*//p')"
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;;
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*)
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