merge-recursive: add pointer about unduly complex looking code

handle_change_delete() has a block of code displaying one of four nearly
identical messages.  Each contains about half a dozen variable
interpolations, which use nearly identical variables as well.  Someone
trying to parse this may be slowed down trying to parse the differences
and why they are here; help them out by adding a comment explaining the
differences.

Further, point out that this code structure isn't collapsed into something
more concise and readable for the programmer, because we want to keep full
messages intact in order to make translators' jobs much easier.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/merge-recursive.c b/merge-recursive.c
index 7cf11dc04c718566ef95af4272abfe31cb036499..284b27d895ecacae3e0afcc1321e22f3cd14f188 100644 (file)
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1476,6 +1476,21 @@ static int handle_change_delete(struct merge_options *o,
                if (!ret)
                        ret = update_file(o, 0, o_oid, o_mode, update_path);
        } else {
+               /*
+                * Despite the four nearly duplicate messages and argument
+                * lists below and the ugliness of the nested if-statements,
+                * having complete messages makes the job easier for
+                * translators.
+                *
+                * The slight variance among the cases is due to the fact
+                * that:
+                *   1) directory/file conflicts (in effect if
+                *      !alt_path) could cause us to need to write the
+                *      file to a different path.
+                *   2) renames (in effect if !old_path) could mean that
+                *      there are two names for the path that the user
+                *      may know the file by.
+                */
                if (!alt_path) {
                        if (!old_path) {
                                output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "