bash prompt: avoid command substitution when checking for untracked files
[gitweb.git] / contrib / completion / git-prompt.sh
index 92f2770769799a8b9695788d95a521bb39a47dba..5ea6a68bc0f6bc707669840f68fee680544f7c2a 100644 (file)
 # GIT_PS1_SHOWCOLORHINTS to a nonempty value. The colors are based on
 # the colored output of "git status -sb".
 
-# __gitdir accepts 0 or 1 arguments (i.e., location)
-# returns location of .git repo
-__gitdir ()
-{
-       # Note: this function is duplicated in git-completion.bash
-       # When updating it, make sure you update the other one to match.
-       if [ -z "${1-}" ]; then
-               if [ -n "${__git_dir-}" ]; then
-                       echo "$__git_dir"
-               elif [ -n "${GIT_DIR-}" ]; then
-                       test -d "${GIT_DIR-}" || return 1
-                       echo "$GIT_DIR"
-               elif [ -d .git ]; then
-                       echo .git
-               else
-                       git rev-parse --git-dir 2>/dev/null
-               fi
-       elif [ -d "$1/.git" ]; then
-               echo "$1/.git"
-       else
-               echo "$1"
-       fi
-}
-
 # stores the divergence from upstream in $p
 # used by GIT_PS1_SHOWUPSTREAM
 __git_ps1_show_upstream ()
@@ -125,7 +101,7 @@ __git_ps1_show_upstream ()
                        fi
                        ;;
                svn-remote.*.url)
-                       svn_remote[ $((${#svn_remote[@]} + 1)) ]="$value"
+                       svn_remote[$((${#svn_remote[@]} + 1))]="$value"
                        svn_url_pattern+="\\|$value"
                        upstream=svn+git # default upstream is SVN if available, else git
                        ;;
@@ -147,10 +123,11 @@ __git_ps1_show_upstream ()
        svn*)
                # get the upstream from the "git-svn-id: ..." in a commit message
                # (git-svn uses essentially the same procedure internally)
-               local svn_upstream=($(git log --first-parent -1 \
+               local -a svn_upstream
+               svn_upstream=($(git log --first-parent -1 \
                                        --grep="^git-svn-id: \(${svn_url_pattern#??}\)" 2>/dev/null))
                if [[ 0 -ne ${#svn_upstream[@]} ]]; then
-                       svn_upstream=${svn_upstream[ ${#svn_upstream[@]} - 2 ]}
+                       svn_upstream=${svn_upstream[${#svn_upstream[@]} - 2]}
                        svn_upstream=${svn_upstream%@*}
                        local n_stop="${#svn_remote[@]}"
                        for ((n=1; n <= n_stop; n++)); do
@@ -334,48 +311,83 @@ __git_ps1 ()
                ;;
        esac
 
-       local g="$(__gitdir)"
-       if [ -z "$g" ]; then
+       local repo_info rev_parse_exit_code
+       repo_info="$(git rev-parse --git-dir --is-inside-git-dir \
+               --is-bare-repository --is-inside-work-tree \
+               --short HEAD 2>/dev/null)"
+       rev_parse_exit_code="$?"
+
+       if [ -z "$repo_info" ]; then
                if [ $pcmode = yes ]; then
                        #In PC mode PS1 always needs to be set
                        PS1="$ps1pc_start$ps1pc_end"
                fi
+               return
+       fi
+
+       local short_sha
+       if [ "$rev_parse_exit_code" = "0" ]; then
+               short_sha="${repo_info##*$'\n'}"
+               repo_info="${repo_info%$'\n'*}"
+       fi
+       local inside_worktree="${repo_info##*$'\n'}"
+       repo_info="${repo_info%$'\n'*}"
+       local bare_repo="${repo_info##*$'\n'}"
+       repo_info="${repo_info%$'\n'*}"
+       local inside_gitdir="${repo_info##*$'\n'}"
+       local g="${repo_info%$'\n'*}"
+
+       local r=""
+       local b=""
+       local step=""
+       local total=""
+       if [ -d "$g/rebase-merge" ]; then
+               read b 2>/dev/null <"$g/rebase-merge/head-name"
+               read step 2>/dev/null <"$g/rebase-merge/msgnum"
+               read total 2>/dev/null <"$g/rebase-merge/end"
+               if [ -f "$g/rebase-merge/interactive" ]; then
+                       r="|REBASE-i"
+               else
+                       r="|REBASE-m"
+               fi
        else
-               local r=""
-               local b=""
-               local step=""
-               local total=""
-               if [ -d "$g/rebase-merge" ]; then
-                       b="$(cat "$g/rebase-merge/head-name")"
-                       step=$(cat "$g/rebase-merge/msgnum")
-                       total=$(cat "$g/rebase-merge/end")
-                       if [ -f "$g/rebase-merge/interactive" ]; then
-                               r="|REBASE-i"
+               if [ -d "$g/rebase-apply" ]; then
+                       read step 2>/dev/null <"$g/rebase-apply/next"
+                       read total 2>/dev/null <"$g/rebase-apply/last"
+                       if [ -f "$g/rebase-apply/rebasing" ]; then
+                               read b 2>/dev/null <"$g/rebase-apply/head-name"
+                               r="|REBASE"
+                       elif [ -f "$g/rebase-apply/applying" ]; then
+                               r="|AM"
                        else
-                               r="|REBASE-m"
+                               r="|AM/REBASE"
                        fi
+               elif [ -f "$g/MERGE_HEAD" ]; then
+                       r="|MERGING"
+               elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
+                       r="|CHERRY-PICKING"
+               elif [ -f "$g/REVERT_HEAD" ]; then
+                       r="|REVERTING"
+               elif [ -f "$g/BISECT_LOG" ]; then
+                       r="|BISECTING"
+               fi
+
+               if [ -n "$b" ]; then
+                       :
+               elif [ -h "$g/HEAD" ]; then
+                       # symlink symbolic ref
+                       b="$(git symbolic-ref HEAD 2>/dev/null)"
                else
-                       if [ -d "$g/rebase-apply" ]; then
-                               step=$(cat "$g/rebase-apply/next")
-                               total=$(cat "$g/rebase-apply/last")
-                               if [ -f "$g/rebase-apply/rebasing" ]; then
-                                       r="|REBASE"
-                               elif [ -f "$g/rebase-apply/applying" ]; then
-                                       r="|AM"
-                               else
-                                       r="|AM/REBASE"
+                       local head=""
+                       if ! read head 2>/dev/null <"$g/HEAD"; then
+                               if [ $pcmode = yes ]; then
+                                       PS1="$ps1pc_start$ps1pc_end"
                                fi
-                       elif [ -f "$g/MERGE_HEAD" ]; then
-                               r="|MERGING"
-                       elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
-                               r="|CHERRY-PICKING"
-                       elif [ -f "$g/REVERT_HEAD" ]; then
-                               r="|REVERTING"
-                       elif [ -f "$g/BISECT_LOG" ]; then
-                               r="|BISECTING"
+                               return
                        fi
-
-                       b="$(git symbolic-ref HEAD 2>/dev/null)" || {
+                       # is it a symbolic ref?
+                       b="${head#ref: }"
+                       if [ "$head" = "$b" ]; then
                                detached=yes
                                b="$(
                                case "${GIT_PS1_DESCRIBE_STYLE-}" in
@@ -389,70 +401,70 @@ __git_ps1 ()
                                        git describe --tags --exact-match HEAD ;;
                                esac 2>/dev/null)" ||
 
-                               b="$(cut -c1-7 "$g/HEAD" 2>/dev/null)..." ||
-                               b="unknown"
+                               b="$short_sha..."
                                b="($b)"
-                       }
+                       fi
                fi
+       fi
 
-               if [ -n "$step" ] && [ -n "$total" ]; then
-                       r="$r $step/$total"
-               fi
+       if [ -n "$step" ] && [ -n "$total" ]; then
+               r="$r $step/$total"
+       fi
 
-               local w=""
-               local i=""
-               local s=""
-               local u=""
-               local c=""
-               local p=""
+       local w=""
+       local i=""
+       local s=""
+       local u=""
+       local c=""
+       local p=""
 
-               if [ "true" = "$(git rev-parse --is-inside-git-dir 2>/dev/null)" ]; then
-                       if [ "true" = "$(git rev-parse --is-bare-repository 2>/dev/null)" ]; then
-                               c="BARE:"
+       if [ "true" = "$inside_gitdir" ]; then
+               if [ "true" = "$bare_repo" ]; then
+                       c="BARE:"
+               else
+                       b="GIT_DIR!"
+               fi
+       elif [ "true" = "$inside_worktree" ]; then
+               if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ] &&
+                  [ "$(git config --bool bash.showDirtyState)" != "false" ]
+               then
+                       git diff --no-ext-diff --quiet --exit-code || w="*"
+                       if [ -n "$short_sha" ]; then
+                               git diff-index --cached --quiet HEAD -- || i="+"
                        else
-                               b="GIT_DIR!"
-                       fi
-               elif [ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]; then
-                       if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ] &&
-                          [ "$(git config --bool bash.showDirtyState)" != "false" ]
-                       then
-                               git diff --no-ext-diff --quiet --exit-code || w="*"
-                               if git rev-parse --quiet --verify HEAD >/dev/null; then
-                                       git diff-index --cached --quiet HEAD -- || i="+"
-                               else
-                                       i="#"
-                               fi
-                       fi
-                       if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ]; then
-                               git rev-parse --verify refs/stash >/dev/null 2>&1 && s="$"
+                               i="#"
                        fi
+               fi
+               if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ] &&
+                  [ -r "$g/refs/stash" ]; then
+                       s="$"
+               fi
 
-                       if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ] &&
-                          [ "$(git config --bool bash.showUntrackedFiles)" != "false" ] &&
-                          [ -n "$(git ls-files --others --exclude-standard)" ]
-                       then
-                               u="%${ZSH_VERSION+%}"
-                       fi
+               if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ] &&
+                  [ "$(git config --bool bash.showUntrackedFiles)" != "false" ] &&
+                  git ls-files --others --exclude-standard --error-unmatch -- '*' >/dev/null 2>/dev/null
+               then
+                       u="%${ZSH_VERSION+%}"
+               fi
 
-                       if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
-                               __git_ps1_show_upstream
-                       fi
+               if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
+                       __git_ps1_show_upstream
                fi
+       fi
 
-               local z="${GIT_PS1_STATESEPARATOR-" "}"
-               local f="$w$i$s$u"
-               if [ $pcmode = yes ]; then
-                       local gitstring=
-                       if [ -n "${GIT_PS1_SHOWCOLORHINTS-}" ]; then
-                               __git_ps1_colorize_gitstring
-                       else
-                               gitstring="$c${b##refs/heads/}${f:+$z$f}$r$p"
-                       fi
-                       gitstring=$(printf -- "$printf_format" "$gitstring")
-                       PS1="$ps1pc_start$gitstring$ps1pc_end"
+       local z="${GIT_PS1_STATESEPARATOR-" "}"
+       local f="$w$i$s$u"
+       if [ $pcmode = yes ]; then
+               local gitstring=
+               if [ -n "${GIT_PS1_SHOWCOLORHINTS-}" ]; then
+                       __git_ps1_colorize_gitstring
                else
-                       # NO color option unless in PROMPT_COMMAND mode
-                       printf -- "$printf_format" "$c${b##refs/heads/}${f:+$z$f}$r$p"
+                       gitstring="$c${b##refs/heads/}${f:+$z$f}$r$p"
                fi
+               gitstring=$(printf -- "$printf_format" "$gitstring")
+               PS1="$ps1pc_start$gitstring$ps1pc_end"
+       else
+               # NO color option unless in PROMPT_COMMAND mode
+               printf -- "$printf_format" "$c${b##refs/heads/}${f:+$z$f}$r$p"
        fi
 }