improve documentation of _append and some doc reorg

[code/myrepos.git] / mr

diff --git a/mr b/mr
index b503fa710b16cfb1f8c176aa044f34df311a5ebf..4dd3a07293076dbd4b49d643b2a598fc581b0273 100755 (executable)
--- a/mr
+++ b/mr
@@ -415,9 +415,13 @@ to keep track of and remember to delete old repositories.
 
 =item lib
 
-The "lib" parameter can specify some shell code that will be run before each
-command, this can be a useful way to define shell functions for other commands
-to use.
+The "lib" parameter can specify some shell code that will be run
+before each command, this can be a useful way to define shell
+functions for other commands to use. 
+
+Unlike most other parameters, this can be specified multiple times, in
+which case the chunks of shell code are accumulatively concatenated
+together.
 
 =item fixups
 
@@ -426,14 +430,7 @@ is checked out, or updated. This provides an easy way to do things
 like permissions fixups, or other tweaks to the repository content,
 whenever the repository is changed.
 
-=item pre_ and post_
-
-If a "pre_action" parameter is set, its command is run before mr performs the
-specified action. Similarly, "post_action" parameters are run after mr
-successfully performs the specified action. For example, "pre_commit" is
-run before committing; "post_update" is run after updating.
-
-=back
+=item VCS_action
 
 When looking for a command to run for a given action, mr first looks for
 a parameter with the same name as the action. If that is not found, it
@@ -447,6 +444,21 @@ the action that is performed for a given version control system, you can
 override these VCS specific actions. To add a new version control system,
 you can just add VCS specific actions for it.
 
+=item pre_ and post_
+
+If a "pre_action" parameter is set, its command is run before mr performs the
+specified action. Similarly, "post_action" parameters are run after mr
+successfully performs the specified action. For example, "pre_commit" is
+run before committing; "post_update" is run after updating.
+
+=item _append
+
+Any parameter can be suffixed with C<_append>, to add an additional value
+to the existing value of the parameter. In this way, actions 
+can be constructed accumulatively.
+
+=back
+
 =head1 UNTRUSTED MRCONFIG FILES
 
 Since mrconfig files can contain arbitrary shell commands, they can do
@@ -1287,8 +1299,8 @@ sub loadconfig {
                        if ($section eq 'ALIAS') {
                                $alias{$parameter}=$value;
                        }
-                       elsif ($parameter eq 'lib') {
-                               $config{$dir}{$section}{lib}.=$value."\n";
+                       elsif ($parameter eq 'lib' or $parameter =~ s/_append$//) {
+                               $config{$dir}{$section}{$parameter}.="\n".$value."\n";
                        }
                        else {
                                $config{$dir}{$section}{$parameter}=$value;