Teach mergetool to write files in a temporary directory when
'mergetool.writeToTemp' is true.

This is helpful for tools such as Eclipse which cannot cope with
multiple copies of the same file in the worktree.

Suggested-by: Charles Bailey <[email protected]>
Signed-off-by: David Aguilar <[email protected]>
---
This patch is dependent on my previous mergetool patches:
"use more conservative temporary..." and the subsequent --tool-help
series.

 Documentation/config.txt |  6 ++++++
 git-mergetool.sh         | 35 +++++++++++++++++++++++++++++++----
 2 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 04a1e2f..be6cf35 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1768,6 +1768,12 @@ mergetool.keepTemporaries::
        preserved, otherwise they will be removed after the tool has
        exited. Defaults to `false`.
 
+mergetool.writeToTemp::
+       Git writes temporary 'BASE', 'LOCAL', and 'REMOTE' versions of
+       conflicting files in the worktree by default.  Git will attempt
+       to use a temporary directory for these files when set `true`.
+       Defaults to `false`.
+
 mergetool.prompt::
        Prompt before each invocation of the merge resolution program.
 
diff --git a/git-mergetool.sh b/git-mergetool.sh
index 10782b8..2b788c5 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -37,6 +37,19 @@ base_present () {
        test -n "$base_mode"
 }
 
+mergetool_tmpdir_init () {
+       if test "$(git config --bool mergetool.writeToTemp)" != true
+       then
+               MERGETOOL_TMPDIR=.
+               return 0
+       fi
+       if MERGETOOL_TMPDIR=$(mktemp -d -t "git-mergetool-XXXXXX" 2>/dev/null)
+       then
+               return 0
+       fi
+       die "error: mktemp is needed when 'mergetool.writeToTemp' is true"
+}
+
 cleanup_temp_files () {
        if test "$1" = --save-backup
        then
@@ -46,6 +59,10 @@ cleanup_temp_files () {
        else
                rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
        fi
+       if test "$MERGETOOL_TMPDIR" != "."
+       then
+               rmdir "$MERGETOOL_TMPDIR"
+       fi
 }
 
 describe_file () {
@@ -235,10 +252,20 @@ merge_file () {
                BASE=$MERGED
                ext=
        fi
-       BACKUP="./${BASE}_BACKUP_$$$ext"
-       LOCAL="./${BASE}_LOCAL_$$$ext"
-       REMOTE="./${BASE}_REMOTE_$$$ext"
-       BASE="./${BASE}_BASE_$$$ext"
+
+       mergetool_tmpdir_init
+
+       if test "$MERGETOOL_TMPDIR" != "."
+       then
+               # If we're using a temporary directory then write to the
+               # top-level of that directory.
+               BASE=${BASE##*/}
+       fi
+
+       BACKUP="$MERGETOOL_TMPDIR/${BASE}_BACKUP_$$$ext"
+       LOCAL="$MERGETOOL_TMPDIR/${BASE}_LOCAL_$$$ext"
+       REMOTE="$MERGETOOL_TMPDIR/${BASE}_REMOTE_$$$ext"
+       BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
 
        base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
        local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print 
$1;}')
-- 
2.1.2.379.gc4e1e0c

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