Add chpwd profiles support

git-svn-id: file:///svn/tfheen/trunk/dotfiles@1378 8da78d58-1cd3-0310-bee5-d77bd1b3e8bf

diff --git a/zshrc b/zshrc
index fc2523d639ae50d367b14e1ba5d72c6b516a384a..92392c4afef45c577c112fdfc795c41025c1fe51 100644 (file)
--- a/zshrc
+++ b/zshrc
@@ -37,6 +37,90 @@ zstyle ':completion:*' match-original both
 zstyle ':completion:*' max-errors 1
 zstyle :compinstall filename '/home/tfheen/.zshrc'
 
+CHPWD_PROFILE='default'
+
+function chpwd_profiles() {
+    # Say you want certain settings to be active in certain directories.
+    # This is what you want.
+    #
+    # zstyle ':chpwd:profiles:/usr/src/grml(|/|/*)'   profile grml
+    # zstyle ':chpwd:profiles:/usr/src/debian(|/|/*)' profile debian
+    #
+    # When that's done and you enter a directory that matches the pattern
+     # in the third part of the context, a function called chpwd_profile_grml,
+     # for example, is called (if it exists).
+     #
+     # If no pattern matches (read: no profile is detected) the profile is
+     # set to 'default', which means chpwd_profile_default is attempted to
+     # be called.
+     #
+     # A word about the context (the ':chpwd:profiles:*' stuff in the zstyle
+     # command) which is used: The third part in the context is matched against
+     # ${PWD}. That's why using a pattern such as /foo/bar(|/|/*) makes sense.
+     # Because that way the profile is detected for all these values of ${PWD}:
+     #   /foo/bar
+     #   /foo/bar/
+     #   /foo/bar/baz
+     # So, if you want to make double damn sure a profile works in /foo/bar
+     # and everywhere deeper in that tree, just use (|/|/*) and be happy.
+     #
+     # The name of the detected profile will be available in a variable called
+     # 'profile' in your functions. You don't need to do anything, it'll just
+     # be there.
+     #
+     # Then there is the parameter $CHPWD_PROFILE is set to the profile, that
+     # was is currently active. That way you can avoid running code for a
+     # profile that is already active, by running code such as the following
+     # at the start of your function:
+     #
+     # function chpwd_profile_grml() {
+     #     [[ ${profile} == ${CHPWD_PROFILE} ]] && return 1
+     #   ...
+     # }
+     #
+     # The initial value for $CHPWD_PROFILE is 'default'.
+     #
+     # Version requirement:
+     #   This feature requires zsh 4.3.3 or newer.
+     #   If you use this feature and need to know whether it is active in your
+     #   current shell, there are several ways to do that. Here are two simple
+     #   ways:
+     #
+     #   a) If knowing if the profiles feature is active when zsh starts is
+     #      good enough for you, you can put the following snippet into your
+     #      .zshrc.local:
+     #
+     #   (( ${+functions[chpwd_profiles]} )) && print "directory profiles active"
+     #
+     #   b) If that is not good enough, and you would prefer to be notified
+     #      whenever a profile changes, you can solve that by making sure you
+     #      start *every* profile function you create like this:
+     #
+     #   function chpwd_profile_myprofilename() {
+     #       [[ ${profile} == ${CHPWD_PROFILE} ]] && return 1
+     #       print "chpwd(): Switching to profile: $profile"
+     #     ...
+     #   }
+     #
+     #      That makes sure you only get notified if a profile is *changed*,
+     #      not everytime you change directory, which would probably piss
+     #      you off fairly quickly. :-)
+     #
+     # There you go. Now have fun with that.
+     local -x profile
+ 
+     zstyle -s ":chpwd:profiles:${PWD}" profile profile || profile='default'
+     if (( ${+functions[chpwd_profile_$profile]} )) ; then
+         chpwd_profile_${profile}
+     fi
+
+     CHPWD_PROFILE="${profile}"
+     return 0
+
+}
+
+chpwd_functions=( ${chpwd_functions} chpwd_profiles )
+
 # Don't beep.  Ever.
 setopt -B