add magic dotdot rationalisation

[etc/zsh.git] / .zsh / zshrc / 85_vcs_prompt

diff --git a/.zsh/zshrc/85_vcs_prompt b/.zsh/zshrc/85_vcs_prompt
index 81e7773ec683be84e63e3115da1d58f86c1ad22b..a99ca184abf9d869868f29528d71edd349c5edb6 100644 (file)
--- a/.zsh/zshrc/85_vcs_prompt
+++ b/.zsh/zshrc/85_vcs_prompt
@@ -10,8 +10,9 @@
 # Shamelessly based on http://glandium.org/blog/?p=170
 #
 
 # Shamelessly based on http://glandium.org/blog/?p=170
 #
 

-__git_get_repo_root()
+__git_get_reporoot()

 {
 {

+  # return the full path to the root of the current git repository

   local relroot
   relroot="$(git rev-parse --show-cdup 2>/dev/null)" || return 1
   if [ -n "$relroot" ]; then
   local relroot
   relroot="$(git rev-parse --show-cdup 2>/dev/null)" || return 1
   if [ -n "$relroot" ]; then


@@ -23,59 +24,143 @@ __git_get_repo_root()
 
 __git_get_branch()
 {
 
 __git_get_branch()
 {

+  # return the name of the git branch we're on

   local ref
   ref=$(git symbolic-ref -q HEAD 2>/dev/null \
   local ref
   ref=$(git symbolic-ref -q HEAD 2>/dev/null \

-     || git-name-rev --name-only HEAD 2>/dev/null)
+     || git-name-rev --name-only HEAD 2>/dev/null) || return 1

   echo "${ref#refs/heads/}"
 }
 
   echo "${ref#refs/heads/}"
 }
 

-__get_root_offsets()
+__hg_get_reporoot()

 {
 {

-  local pwda reporoot loc
-  pwda=(${(s:/:)PWD})
-  reporoot=(${(s:/:)1})
-  echo $((1 - $#reporoot)) $(($#pwda - $#reporoot))
+  hg root

 }
 
 }
 

-__get_prompt_path_components()
+__hg_get_branch()
+{
+  echo "hg:$(hg branch)"
+}
+
+__bzr_get_reporoot()

 {
   local reporoot
 {
   local reporoot

-  reporoot="$1"
+  reporoot="$(bzr info | sed -rne 's, *branch root: ,,p')"
+  case "$reporoot" in
+    .) echo "$PWD";;
+    *) echo "$reporoot";;
+  esac
+}

 
 

-  set -- $(__get_root_offsets "$reporoot")
-  if [ "$2" -le 0 ]; then
-    echo %~
-  else
-    echo "%${1}~" "%${2}~"
-  fi
+__bzr_get_branch()
+{
+  local branch revno
+  bzr version-info | while read i j; do
+      case "$i" in
+        revno:) revno="$j";;
+        branch-nick:) branch="$j";;
+      esac
+    done
+  echo "bzr:${branch}@$revno"

 }
 
 __vcs_get_repo_type()
 {
 }
 
 __vcs_get_repo_type()
 {

-  if __git_get_repo_root >/dev/null; then
-    echo git
-  else
-    echo NONE
+  # return the type of the closest repository in the path hierarchy
+  local dir
+  while true; do
+    [ -d ${dir}.git ] && echo git && break
+    [ -d ${dir}.bzr ] && echo bzr && break
+    [ -d ${dir}.hg ] && echo hg && break
+    [ "$(readlink -f ${dir:-.})" = / ] && echo NONE && break
+    dir="../$dir"
+  done
+}
+
+__vcs_get_prompt_path_components()
+{
+  # return formatted path components (prefix branch postfix) given
+  # the repository root and the branch.
+
+  # shortcut: if there are no arguments, return a default prompt
+  if [ -z "${1:-}" ]; then
+    pwdnamed="%${_PROMPT_PATH_MAXLEN}<..<%~%<<"
+    pwdnamed="${(%)pwdnamed}"
+    echo "$pwdnamed"
+    return

   fi
   fi

+
+  local reporoot branch
+  reporoot="${1%%/}"
+  branch="$2"
+
+  # replace named directories in the PWD, we need thi for the proper component
+  # count later
+  local pwdnamed="%~"
+  pwdnamed="${(%)pwdnamed}"
+
+  # store paths in arrays for component count calculation
+  typeset -la apwd apwdnamed areporoot
+  apwd=(${(s:/:)PWD})
+  apwdnamed=(${(s:/:)pwdnamed})
+  areporoot=(${(s:/:)reporoot})
+
+  # get the number of leading and trailing path components. Since we're using
+  # %~ later and then /home/madduck suddenly becomes ~, which is 1, not
+  # 2 components, we calculate the leading component count by using the named
+  # path and the number of post components
+  local precomps postcomps
+  postcomps=$(($#apwd - $#areporoot))
+  precomps=$(($#apwdnamed - $postcomps))
+
+  local postfix
+  if (( $postcomps > 0 )); then
+    postfix="%${postcomps}~"
+    postfix="${(%)postfix}"
+  fi
+
+  # we don't want the prompt to get too long, so keep the total prompt length
+  # under $_PROMPT_PATH_MAXLEN (25), but ensure that the prefix is not shorter
+  # than $_PROMPT_PATH_MINLEN (10), no matter what
+  local prelen minlen prefix
+  prelen=$((${_PROMPT_PATH_MAXLEN:-25} - $#branch - $#postfix))
+  minlen=${_PROMPT_PATH_MINLEN:-10}
+  (( $prelen < $minlen )) && prelen=$minlen
+  prefix="%${prelen}<..<%-${precomps}~%<<"
+  prefix="${(%)prefix}"
+
+  echo "$prefix" "$branch" "$postfix"

 }
 
 __vcs_set_prompt_variables()
 {
 }
 
 __vcs_set_prompt_variables()
 {

-  local pre branch post
-  local MAXLEN=25
+  # set psvar[1..3] depending on repo type, or just psvar[1] if no repo found
+  local reporoot branch repotype
+  repotype="${1:-$(__vcs_get_repo_type)}"

 
 

-  case "${1:-$(__vcs_get_repo_type)}" in
+  case "$repotype" in

     git)
     git)

-      local reporoot="$(__git_get_repo_root)"
-      set -- $(__get_prompt_path_components "$reporoot")
-      branch="$(__git_get_branch)"
-      post="${(%)2}"
-      local prelen="$((MAXLEN - $#post - $#branch))"
-      [ $prelen -lt 10 ] && prelen=10
-      pre="%${prelen}<..<${1}%<<"
-      pre="${(%)pre}"
+      reporoot="$(__git_get_reporoot)" ||
+        { error "could not determine git repository root"; return 1 }
+      branch="$(__git_get_branch)" ||
+        { error "could not determine git branch"; return 1 }
+      ;;
+    hg)
+      reporoot="$(__hg_get_reporoot)" ||
+        { error "could not determine hg repository root"; return 1 }
+      branch="$(__hg_get_branch)" ||
+        { error "could not determine hg branch"; return 1 }
+      ;;
+    bzr)
+      reporoot="$(__bzr_get_reporoot)" ||
+        { error "could not determine bzr repository root"; return 1 }
+      branch="$(__bzr_get_branch)" ||
+        { error "could not determine bzr branch"; return 1 }

       ;;
     *)
       ;;
     *)

+      case "$repotype" in
+        NONE) :;;
+        *) warn "$repotype repositories not (yet) supported in the prompt";;
+      esac

       local p="%${MAXLEN}<..<%~%<<"
       #TODO find a better way so we don't have to nuke $psvar, but since the
       #     %(nv.true.false) check for prompts checks element count, not
       local p="%${MAXLEN}<..<%~%<<"
       #TODO find a better way so we don't have to nuke $psvar, but since the
       #     %(nv.true.false) check for prompts checks element count, not


@@ -84,9 +169,10 @@ __vcs_set_prompt_variables()
       return
   esac
 
       return
   esac
 

-  psvar[1]="$pre"
-  psvar[2]="$branch"
-  psvar[3]="$post"
+  set -- $(__vcs_get_prompt_path_components "$reporoot" "$branch")
+  psvar[1]="$1"
+  psvar[2]="$2"
+  psvar[3]="$3"

 }
 
 if ! is_root; then
 }
 
 if ! is_root; then


@@ -96,7 +182,7 @@ if ! is_root; then
     local vcs="$(__vcs_get_repo_type)"
     case "$(history $(($HISTCMD - 1)))" in
       # $vcs appeared in last command, so be sure to update
     local vcs="$(__vcs_get_repo_type)"
     case "$(history $(($HISTCMD - 1)))" in
       # $vcs appeared in last command, so be sure to update

-      *${vcs}*) __vcs_set_prompt_variables
+      *${vcs}*) __vcs_set_prompt_variables "$vcs"

     esac
   }
   precmd_functions+=_update_vcs_prompt_vars_if_vcs_ran
     esac
   }
   precmd_functions+=_update_vcs_prompt_vars_if_vcs_ran