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author | SZEDER Gábor <szeder.dev@gmail.com> | 2017-02-03 03:48:29 +0100 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2017-02-03 22:18:41 -0800 |
commit | fad9484f0aebc818112fb52270ebcddc768a7573 (patch) | |
tree | faf288e44536af8a5916c46557f225e0f4f4d80c /contrib | |
parent | completion: extract repository discovery from __gitdir() (diff) | |
download | tgif-fad9484f0aebc818112fb52270ebcddc768a7573.tar.xz |
completion: cache the path to the repository
After the previous changes in this series there are only a handful of
$(__gitdir) command substitutions left in the completion script, but
there is still a bit of room for improvements:
1. The command substitution involves the forking of a subshell,
which has considerable overhead on some platforms.
2. There are a few cases, where this command substitution is
executed more than once during a single completion, which means
multiple subshells and possibly multiple 'git rev-parse'
executions. __gitdir() is invoked twice while completing refs
for e.g. 'git log', 'git rebase', 'gitk', or while completing
remote refs for 'git fetch' or 'git push'.
Both of these points can be addressed by using the
__git_find_repo_path() helper function introduced in the previous
commit:
1. __git_find_repo_path() stores the path to the repository in a
variable instead of printing it, so the command substitution
around the function can be avoided. Or rather: the command
substitution should be avoided to make the new value of the
variable set inside the function visible to the callers.
(Yes, there is now a command substitution inside
__git_find_repo_path() around each 'git rev-parse', but that's
executed only if necessary, and only once per completion, see
point 2. below.)
2. $__git_repo_path, the variable holding the path to the
repository, is declared local in the toplevel completion
functions __git_main() and __gitk_main(). Thus, once set, the
path is visible in all completion functions, including all
subsequent calls to __git_find_repo_path(), meaning that they
wouldn't have to re-discover the path to the repository.
So call __git_find_repo_path() and use $__git_repo_path instead of the
$(__gitdir) command substitution to access paths in the .git
directory. Turn tests checking __gitdir()'s repository discovery into
tests of __git_find_repo_path() such that only the tested function
changes but the expected results don't, ensuring that repo discovery
keeps working as it did before.
As __gitdir() is not used anymore in the completion script, mark it as
deprecated and direct users' attention to __git_find_repo_path() and
$__git_repo_path. Yet keep four __gitdir() tests to ensure that it
handles success and failure of __git_find_repo_path() and that it
still handles its optional remote argument, because users' custom
completion scriptlets might depend on it.
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'contrib')
-rw-r--r-- | contrib/completion/git-completion.bash | 46 |
1 files changed, 29 insertions, 17 deletions
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash index 9b9526b48d..d2601aee94 100644 --- a/contrib/completion/git-completion.bash +++ b/contrib/completion/git-completion.bash @@ -39,6 +39,11 @@ esac # variable. __git_find_repo_path () { + if [ -n "$__git_repo_path" ]; then + # we already know where it is + return + fi + if [ -n "${__git_C_args-}" ]; then __git_repo_path="$(git "${__git_C_args[@]}" \ ${__git_dir:+--git-dir="$__git_dir"} \ @@ -56,6 +61,7 @@ __git_find_repo_path () fi } +# Deprecated: use __git_find_repo_path() and $__git_repo_path instead # __gitdir accepts 0 or 1 arguments (i.e., location) # returns location of .git repo __gitdir () @@ -350,10 +356,13 @@ __git_tags () # 'git checkout's tracking DWIMery (optional; ignored, if set but empty). __git_refs () { - local i hash dir="$(__gitdir)" track="${2-}" + local i hash dir track="${2-}" local list_refs_from=path remote="${1-}" local format refs pfx + __git_find_repo_path + dir="$__git_repo_path" + if [ -z "$remote" ]; then if [ -z "$dir" ]; then return @@ -458,8 +467,8 @@ __git_refs_remotes () __git_remotes () { - local d="$(__gitdir)" - test -d "$d/remotes" && ls -1 "$d/remotes" + __git_find_repo_path + test -d "$__git_repo_path/remotes" && ls -1 "$__git_repo_path/remotes" __git remote } @@ -957,8 +966,8 @@ __git_whitespacelist="nowarn warn error error-all fix" _git_am () { - local dir="$(__gitdir)" - if [ -d "$dir"/rebase-apply ]; then + __git_find_repo_path + if [ -d "$__git_repo_path"/rebase-apply ]; then __gitcomp "--skip --continue --resolved --abort" return fi @@ -1041,7 +1050,8 @@ _git_bisect () local subcommands="start bad good skip reset visualize replay log run" local subcommand="$(__git_find_on_cmdline "$subcommands")" if [ -z "$subcommand" ]; then - if [ -f "$(__gitdir)"/BISECT_START ]; then + __git_find_repo_path + if [ -f "$__git_repo_path"/BISECT_START ]; then __gitcomp "$subcommands" else __gitcomp "replay start" @@ -1146,8 +1156,8 @@ _git_cherry () _git_cherry_pick () { - local dir="$(__gitdir)" - if [ -f "$dir"/CHERRY_PICK_HEAD ]; then + __git_find_repo_path + if [ -f "$__git_repo_path"/CHERRY_PICK_HEAD ]; then __gitcomp "--continue --quit --abort" return fi @@ -1538,10 +1548,10 @@ __git_log_date_formats="relative iso8601 rfc2822 short local default raw" _git_log () { __git_has_doubledash && return + __git_find_repo_path - local g="$(__gitdir)" local merge="" - if [ -f "$g/MERGE_HEAD" ]; then + if [ -f "$__git_repo_path/MERGE_HEAD" ]; then merge="--merge" fi case "$cur" in @@ -1788,11 +1798,12 @@ _git_push () _git_rebase () { - local dir="$(__gitdir)" - if [ -f "$dir"/rebase-merge/interactive ]; then + __git_find_repo_path + if [ -f "$__git_repo_path"/rebase-merge/interactive ]; then __gitcomp "--continue --skip --abort --quit --edit-todo" return - elif [ -d "$dir"/rebase-apply ] || [ -d "$dir"/rebase-merge ]; then + elif [ -d "$__git_repo_path"/rebase-apply ] || \ + [ -d "$__git_repo_path"/rebase-merge ]; then __gitcomp "--continue --skip --abort --quit" return fi @@ -2467,8 +2478,8 @@ _git_reset () _git_revert () { - local dir="$(__gitdir)" - if [ -f "$dir"/REVERT_HEAD ]; then + __git_find_repo_path + if [ -f "$__git_repo_path"/REVERT_HEAD ]; then __gitcomp "--continue --quit --abort" return fi @@ -2865,9 +2876,10 @@ __gitk_main () __git_has_doubledash && return local __git_repo_path - local g="$(__gitdir)" + __git_find_repo_path + local merge="" - if [ -f "$g/MERGE_HEAD" ]; then + if [ -f "$__git_repo_path/MERGE_HEAD" ]; then merge="--merge" fi case "$cur" in |