X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=doc%2Fgrmlzshrc.t2t;h=89766845797037a84d6725fa7fb453edb2f10eb9;hb=refs%2Fheads%2Fft%2Fchpwd-profiles;hp=d39ad1ca138dd29d9c20506a113a605c2d6190ff;hpb=638c1910c6d6708c020bd068510825854410e587;p=grml-etc-core.git diff --git a/doc/grmlzshrc.t2t b/doc/grmlzshrc.t2t index d39ad1c..8976684 100644 --- a/doc/grmlzshrc.t2t +++ b/doc/grmlzshrc.t2t @@ -121,83 +121,117 @@ zshs inherit the dirstack of the zsh that most recently updated **DIRSTACKFILE**. == DIRECTORY BASED PROFILES == -If you want certain settings to be active in certain directories (and -automatically switch back and forth between them), this is what you want. + +If you need to perform certain actions each time you enter certain +directory-trees, this is the feature you are looking for. + + +=== Initialisation === +To initialise the system, you need to call the function `chpwd_profiles' at +some point in your `zshrc.local'; preferably **after** you configured the +system. The configuration of the system is described further below. + +If you need to do initialisations the first time `chpwd_profiles' is called +(which should be in your configuration file), you can do that in a function +called "chpwd_profiles_init". That function needs to be defined **before** +`chpwd_profiles' is called for this to work. + +During the **first** call of `chpwd_profiles' (and therefore all its profile +functions) the parameter `$CHPWD_PROFILES_INIT' exists and is set to `1'. In +all other cases, the parameter does not exist at all. + + +=== Styles and Profile-names === +To store its configuration, the system uses **functions** and **styles** +(zsh's context sensitive configuration system), such as this: + \ ``` zstyle ':chpwd:profiles:/usr/src/grml(|/|/*)' profile grml zstyle ':chpwd:profiles:/usr/src/debian(|/|/*)' profile debian ``` -When that's done and you enter a directory that matches the pattern -in the third part of the context, a function called chpwd_profile_grml, -for example, is called (if it exists). +When that's done and you enter a directory that matches the pattern in the +third part of the context, a function called chpwd_profile_grml, for example, +is called (if it exists). -If no pattern matches (read: no profile is detected) the profile is -set to 'default', which means chpwd_profile_default is attempted to -be called. +If no pattern matches (read: no profile is detected) the profile is set to +'default', which means chpwd_profile_default is attempted to be called. -A word about the context (the ':chpwd:profiles:*' stuff in the zstyle -command) which is used: The third part in the context is matched against -**$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**: +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 ${PWD}: \ ``` -/foo/bar -/foo/bar/ -/foo/bar/baz + /foo/bar + /foo/bar/ + /foo/bar/baz ``` - -So, if you want to make double damn sure a profile works in /foo/bar -and everywhere deeper in that tree, just use (|/|/*) and be happy. +So, if you want to make double damn sure a profile works in /foo/bar and +everywhere deeper in that tree, just use (|/|/*) and be happy. The name of the detected profile will be available in a variable called -'profile' in your functions. You don't need to do anything, it'll just -be there. +'profile' in your functions. You don't need to do anything, it'll just be +there. + + +=== Controlling Profile Execution === -Then there is the parameter **$CHPWD_PROFILE** which is set to the profile, -that was active up to now. 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: +During its initialisation run, the system creates a parameter $CHPWD_PROFILE, +which is set to the profile that was is currently active (the default value is +"default"). 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'. +If you know you are going to do that all the time for each and every +directory-profile function you are ever going to write, you may also set the +`re-execute' style to `false' (which only defaults to `true' for backwards +compatibility), like this: +\ +``` + zstyle ':chpwd:profiles:*' re-execute false +``` + === Signaling availabily/profile changes === -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: +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" -``` +a) If knowing if the profiles feature is active when zsh starts is good +enough for you, you can use the following snippet: + +(( ${+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: -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. +That makes sure you only get notified if a profile is **changed**, not +everytime you change directory. (To avoid this, you may also set the newer +`re-execute' style like described further above instead of the test on top of +the function. + + +=== Leaving Profiles === + +When the system switches from one profile to another, it executes a function +named "chpwd_leave_profile_()" before calling the +profile-function for the new profile. + === Version requirement === This feature requires zsh //4.3.3// or newer.