Implement hook system

Thanks to Vincent Demeester for this idea.

diff --git a/doc/vcsh.1.ronn b/doc/vcsh.1.ronn
index 9e37ca131314f2e648278e35d0366c9c94439855..c6e0152973a7b123e08506f193efcdfd3b91ab27 100644 (file)
--- a/doc/vcsh.1.ronn
+++ b/doc/vcsh.1.ronn
@@ -111,6 +111,21 @@ an interactive user.
 As noted earlier, `vcsh` will set <$GIT_DIR> and <$GIT_WORK_TREE> to the
 appropriate values for fake bare git repositories.
 
+## HOOK SYSTEM
+
+`vcsh` provides a hook system. Hook scripts need to be executable and placed
+in <$XDG_CONFIG_HOME/vcsh/hooks-available>. From there, they should be
+soft-linked <$XDG_CONFIG_HOME/vcsh/hooks-enabled>.
+
+Hooks follow a simple format. `pre-run` will be run before anything is run.
+If you want to have more than one script for a certain hook, just append
+strings to order them. A system of `pre-run`, `pre-run.10`, `pre-run.20` etc
+is suggested. The dot it optional.
+
+If you want to create hooks for a specific `vcsh` repository, simply prepend
+the repository's name, followed by a dot, i.e. `zsh.pre-run`. This dot is
+mandatory.
+
 ## DETAILED HOWTO AND FURTHER READING
 
 Man pages are intended to be short and thus often useless to glean best

diff --git a/vcsh b/vcsh
index 52afbe174348bdc1d6f1b78baa9136cb73a8cdbc..bf97cbfb0a92a632e5961d9d51c54d5ae8a16ee4 100755 (executable)
--- a/vcsh
+++ b/vcsh
@@ -11,6 +11,7 @@
 [ -r "$XDG_CONFIG_HOME/vcsh/config" ] && . "$XDG_CONFIG_HOME/vcsh/config"
 [ -n "$VCSH_DEBUG" ]                  && set -vx
 [ -z "$VCSH_REPO_D" ]                 && VCSH_REPO_D="$XDG_CONFIG_HOME/vcsh/repo.d"
+[ -z "$VCSH_HOOK_D" ]                 && VCSH_HOOK_D="$XDG_CONFIG_HOME/vcsh/hooks-enabled"
 [ -z "$VCSH_BASE" ]                   && VCSH_BASE="$HOME"
 [ -z "$VCSH_GITIGNORE" ]              && VCSH_GITIGNORE='exact'
 
@@ -103,14 +104,23 @@ To continue, type \"Yes, do as I say\""
 }
 
 enter() {
+       hook pre-enter
        use
        $SHELL
+       hook post-enter
 }
 
 git_dir_exists() {
        [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
 }
 
+hook() {
+       for f in $VCSH_HOOK_D/$1* $VCSH_HOOK_D/$VCSH_REPO_NAME.$1*; do
+               [ -x "$f" ] || continue
+               "$f"
+       done
+}
+
 init() {
        [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
        export GIT_WORK_TREE="$VCSH_BASE"
@@ -150,8 +160,10 @@ rename() {
 }
 
 run() {
+       hook pre-run
        use
        $VCSH_EXTERNAL_COMMAND
+       hook post-run
 }
 
 setup() {