patchRe: [StGIT PATCH] StGIT bash completion

diff --git a/contrib/stgit-completion.bash b/contrib/stgit-completion.bash
new file mode 100644
index 0000000..25549fb
--- /dev/null
+++ b/contrib/stgit-completion.bash
@@ -0,0 +1,156 @@
+# bash completion support for StGIT                        -*- shell-script -*-
+#
+# Copyright (C) 2006, Karl Hasselström <kha@treskal.com>
+# Based on git-completion.sh
+#
+# To use these routines:
+#
+#    1. Copy this file to somewhere (e.g. ~/.stgit-completion.bash).
+#
+#    2. Add the following line to your .bashrc:
+#         . ~/.stgit-completion.bash
+
+# The path to .git, or empty if we're not in a repository.
+_gitdir ()
+{
+    echo "$(git rev-parse --git-dir 2>/dev/null)"
+}
+
+# Name of the current branch, or empty if there isn't one.
+_current_branch ()
+{
+    local b=$(git symbolic-ref HEAD 2>/dev/null)
+    echo ${b#refs/heads/}
+}
+
+# List of all applied patches.
+_applied_patches ()
+{
+    local g=$(_gitdir)
+    [ "$g" ] && cat "$g/patches/$(_current_branch)/applied"
+}
+
+# List of all unapplied patches.
+_unapplied_patches ()
+{
+    local g=$(_gitdir)
+    [ "$g" ] && cat "$g/patches/$(_current_branch)/unapplied"
+}
+
+# List of all patches.
+_all_patches ()
+{
+    local b=$(_current_branch)
+    local g=$(_gitdir)
+    [ "$g" ] && cat "$g/patches/$b/applied" "$g/patches/$b/unapplied"
+}
+
+# List of all patches except the current patch.
+_all_other_patches ()
+{
+    local b=$(_current_branch)
+    local g=$(_gitdir)
+    [ "$g" ] && cat "$g/patches/$b/applied" "$g/patches/$b/unapplied" \
+        | grep -v "^$(< $g/patches/$b/current)$"
+}
+
+# Generate completions for patches and patch ranges from the given
+# patch list function, and options from the given list.
+_complete_patch_range ()
+{
+    local patchlist="$1" options="$2"
+    local pfx cur="${COMP_WORDS[COMP_CWORD]}"
+    case "$cur" in
+        *..*)
+            pfx="${cur%..*}.."
+            cur="${cur#*..}"
+            COMPREPLY=($(compgen -P "$pfx" -W "$($patchlist)" -- "$cur"))
+            ;;
+        *)
+            COMPREPLY=($(compgen -W "$options $($patchlist)" -- "$cur"))
+            ;;
+    esac
+}
+
+# Generate completions for options from the given list.
+_complete_options ()
+{
+    local options="$1"
+    COMPREPLY=($(compgen -W "$options" -- "${COMP_WORDS[COMP_CWORD]}"))
+}
+
+_stg_delete ()
+{
+    _complete_patch_range _all_patches "--branch --help"
+}
+
+_stg_goto ()
+{
+    _complete_patch_range _all_other_patches "--help"
+}
+
+_stg_mail ()
+{
+    _complete_patch_range _all_patches \
+        "--all --to --cc --bcc --auto --noreply --version --prefix --template \
+         --cover --edit-cover --edit-patches --sleep --refid --smtp-user \
+         --smtp-password --branch --mbox --help"
+}
+
+_stg_new ()
+{
+    _complete_options "--message --showpatch --author --authname --authemail \
+                       --authdate --commname --commemail --help"
+}
+
+_stg_pop ()
+{
+    _complete_patch_range _applied_patches "--all --number --keep --help"
+}
+
+_stg_push ()
+{
+    _complete_patch_range _unapplied_patches "--all --number --reverse \
+                                              --merged --undo --help"
+}
+
+_stg_status ()
+{
+    _complete_options "--modified --new --deleted --conflict --unknown \
+                       --noexclude --reset --help"
+}
+
+_stg ()
+{
+    local i c=1 command
+
+    while [ $c -lt $COMP_CWORD ]; do
+        if [ $c == 1 ]; then
+            command="${COMP_WORDS[c]}"
+        fi
+        c=$((++c))
+    done
+
+    # Complete name of subcommand.
+    if [ $c -eq $COMP_CWORD -a -z "$command" ]; then
+        COMPREPLY=($(compgen \
+            -W "--help --version \
+                $(stg help|grep '^ '|sed 's/ *\([^ ]\) .*/\1/')" \
+            -- "${COMP_WORDS[COMP_CWORD]}"))
+        return;
+    fi
+
+    # Complete arguments to subcommands.
+    case "$command" in
+        delete) _stg_delete ;;
+        goto)   _stg_goto ;;
+        mail)   _stg_mail ;;
+        new)    _stg_new ;;
+        pop)    _stg_pop ;;
+        push)   _stg_push ;;
+        status) _stg_status ;;
+        *)      COMPREPLY=() ;;
+    esac
+}
+