As part of its operation, doc-diff creates a bunch of temporary
working files and holds onto them in order to speed up subsequent
invocations. These files are never deleted. Moreover, it creates a
temporary working tree (via git-wortkree) which likewise never gets
removed.

Without knowing the implementation details of the tool, a user may not
know how to clean up manually afterward. Worse, the user may find it
surprising and alarming to discover a working tree which s/he did not
create explicitly.

To address these issues, add a --clean mode which removes the
temporary working tree and deletes all generated files.

Signed-off-by: Eric Sunshine <sunsh...@sunshineco.com>
---
 Documentation/doc-diff | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/Documentation/doc-diff b/Documentation/doc-diff
index c2906eac5e..f397fd229b 100755
--- a/Documentation/doc-diff
+++ b/Documentation/doc-diff
@@ -2,20 +2,25 @@
 
 OPTIONS_SPEC="\
 doc-diff [options] <from> <to> [-- <diff-options>]
+doc-diff (-c|--clean)
 --
 j=n    parallel argument to pass to make
 f      force rebuild; do not rely on cached results
+c,clean        cleanup temporary working files
 "
 SUBDIRECTORY_OK=1
 . "$(git --exec-path)/git-sh-setup"
 
 parallel=
 force=
+clean=
 while test $# -gt 0
 do
        case "$1" in
        -j)
                parallel=$2; shift ;;
+       -c|--clean)
+               clean=t ;;
        -f)
                force=t ;;
        --)
@@ -26,6 +31,17 @@ do
        shift
 done
 
+cd_to_toplevel
+tmp=Documentation/tmp-doc-diff
+
+if test -n "$clean"
+then
+       test $# -eq 0 || usage
+       git worktree remove --force "$tmp/worktree" 2>/dev/null
+       rm -rf "$tmp"
+       exit 0
+fi
+
 if test -z "$parallel"
 then
        parallel=$(getconf _NPROCESSORS_ONLN 2>/dev/null)
@@ -42,9 +58,6 @@ to=$1; shift
 from_oid=$(git rev-parse --verify "$from") || exit 1
 to_oid=$(git rev-parse --verify "$to") || exit 1
 
-cd_to_toplevel
-tmp=Documentation/tmp-doc-diff
-
 if test -n "$force"
 then
        rm -rf "$tmp"
-- 
2.19.0.rc1.352.gb1634b371d

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