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-rw-r--r--git-mergetool--lib.sh56
1 files changed, 45 insertions, 11 deletions
diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index 9abd00be21..9a8b97a2ab 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -125,16 +125,7 @@ setup_user_tool () {
}
merge_cmd () {
- trust_exit_code=$(git config --bool \
- "mergetool.$1.trustExitCode" || echo false)
- if test "$trust_exit_code" = "false"
- then
- touch "$BACKUP"
- ( eval $merge_tool_cmd )
- check_unchanged
- else
- ( eval $merge_tool_cmd )
- fi
+ ( eval $merge_tool_cmd )
}
}
@@ -162,6 +153,28 @@ setup_tool () {
echo "$1"
}
+ # Most tools' exit codes cannot be trusted, so By default we ignore
+ # their exit code and check the merged file's modification time in
+ # check_unchanged() to determine whether or not the merge was
+ # successful. The return value from run_merge_cmd, by default, is
+ # determined by check_unchanged().
+ #
+ # When a tool's exit code can be trusted then the return value from
+ # run_merge_cmd is simply the tool's exit code, and check_unchanged()
+ # is not called.
+ #
+ # The return value of exit_code_trustable() tells us whether or not we
+ # can trust the tool's exit code.
+ #
+ # User-defined and built-in tools default to false.
+ # Built-in tools advertise that their exit code is trustable by
+ # redefining exit_code_trustable() to true.
+
+ exit_code_trustable () {
+ false
+ }
+
+
if ! test -f "$MERGE_TOOLS_DIR/$tool"
then
setup_user_tool
@@ -197,6 +210,19 @@ get_merge_tool_cmd () {
fi
}
+trust_exit_code () {
+ if git config --bool "mergetool.$1.trustExitCode"
+ then
+ :; # OK
+ elif exit_code_trustable
+ then
+ echo true
+ else
+ echo false
+ fi
+}
+
+
# Entry point for running tools
run_merge_tool () {
# If GIT_PREFIX is empty then we cannot use it in tools
@@ -225,7 +251,15 @@ run_diff_cmd () {
# Run a either a configured or built-in merge tool
run_merge_cmd () {
- merge_cmd "$1"
+ mergetool_trust_exit_code=$(trust_exit_code "$1")
+ if test "$mergetool_trust_exit_code" = "true"
+ then
+ merge_cmd "$1"
+ else
+ touch "$BACKUP"
+ merge_cmd "$1"
+ check_unchanged
+ fi
}
list_merge_tool_candidates () {