completion: offer ctags symbol names for 'git log -S', '-G' and '-L:'

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 5ac609a79ca077bc67339146696039884b32d5c1..d6f25a7e0b3f50b6f6f6d5b645fe794c1cbe4788 100644 (file)
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1529,6 +1529,34 @@ __git_match_ctag () {
                " "$2"
 }
 
+# Complete symbol names from a tag file.
+# Usage: __git_complete_symbol [<option>]...
+# --tags=<file>: The tag file to list symbol names from instead of the
+#                default "tags".
+# --pfx=<prefix>: A prefix to be added to each symbol name.
+# --cur=<word>: The current symbol name to be completed.  Defaults to
+#               the current word to be completed.
+# --sfx=<suffix>: A suffix to be appended to each symbol name instead
+#                 of the default space.
+__git_complete_symbol () {
+       local tags=tags pfx="" cur_="${cur-}" sfx=" "
+
+       while test $# != 0; do
+               case "$1" in
+               --tags=*)       tags="${1##--tags=}" ;;
+               --pfx=*)        pfx="${1##--pfx=}" ;;
+               --cur=*)        cur_="${1##--cur=}" ;;
+               --sfx=*)        sfx="${1##--sfx=}" ;;
+               *)              return 1 ;;
+               esac
+               shift
+       done
+
+       if test -r "$tags"; then
+               __gitcomp_direct "$(__git_match_ctag "$cur_" "$tags" "$pfx" "$sfx")"
+       fi
+}
+
 _git_grep ()
 {
        __git_has_doubledash && return
@@ -1554,10 +1582,7 @@ _git_grep ()
 
        case "$cword,$prev" in
        2,*|*,-*)
-               if test -r tags; then
-                       __gitcomp_direct "$(__git_match_ctag "$cur" tags "" " ")"
-                       return
-               fi
+               __git_complete_symbol && return
                ;;
        esac
 
@@ -1662,6 +1687,19 @@ _git_log ()
        if [ -f "$__git_repo_path/MERGE_HEAD" ]; then
                merge="--merge"
        fi
+       case "$prev,$cur" in
+       -L,:*:*)
+               return  # fall back to Bash filename completion
+               ;;
+       -L,:*)
+               __git_complete_symbol --cur="${cur#:}" --sfx=":"
+               return
+               ;;
+       -G,*|-S,*)
+               __git_complete_symbol
+               return
+               ;;
+       esac
        case "$cur" in
        --pretty=*|--format=*)
                __gitcomp "$__git_log_pretty_formats $(__git_pretty_aliases)
@@ -1707,6 +1745,21 @@ _git_log ()
                        "
                return
                ;;
+       -L:*:*)
+               return  # fall back to Bash filename completion
+               ;;
+       -L:*)
+               __git_complete_symbol --cur="${cur#-L:}" --sfx=":"
+               return
+               ;;
+       -G*)
+               __git_complete_symbol --pfx="-G" --cur="${cur#-G}"
+               return
+               ;;
+       -S*)
+               __git_complete_symbol --pfx="-S" --cur="${cur#-S}"
+               return
+               ;;
        esac
        __git_complete_revlist
 }