whatchanged: customize diff-tree output

This allows the configuration item whatchanged.difftree to
control the output from git-whatchanged command.  For example:

	[whatchanged]
        	difftree = --pretty=fuller --name-status -M

does rename detection, shows the commit header in "fuller"
format and lists affected pathnames and the kind of changes to
them.

When no such configuration item exists, the output format
defaults to "--pretty -M --abbrev".

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-whatchanged.sh b/git-whatchanged.sh
index b170f74a94e42dbf82f2e94b831f1cf6b49a2b4c..80e2500e0ea1769d9d92454c667852dd2056ef04 100755 (executable)
--- a/git-whatchanged.sh
+++ b/git-whatchanged.sh
@@ -4,9 +4,15 @@ USAGE='[-p] [--max-count=<n>] [<since>..<limit>] [--pretty=<format>] [-m] [git-d
 SUBDIRECTORY_OK='Yes'
 . git-sh-setup
 
+diff_tree_flags=$(git-rev-parse --sq --no-revs --flags "$@")
+test -z "$diff_tree_flags" &&
+       diff_tree_flags=$(git-repo-config --get whatchanged.difftree)
+test -z "$diff_tree_flags" &&
+       diff_tree_flags='-M --abbrev'
+
 rev_list_args=$(git-rev-parse --sq --default HEAD --revs-only "$@") &&
-diff_tree_args=$(git-rev-parse --sq --no-revs "$@") &&
+diff_tree_args=$(git-rev-parse --sq --no-revs --no-flags "$@") &&
 
 eval "git-rev-list $rev_list_args" |
-eval "git-diff-tree --stdin --pretty -r $diff_tree_args" |
+eval "git-diff-tree --stdin --pretty -r $diff_tree_flags $diff_tree_args" |
 LESS="$LESS -S" ${PAGER:-less}