[PATCH v1] add status config and command line options for rename detection

From: Ben Peart <ben.peart@microsoft.com>
Date: May 9, 2018, 14:42 UTC
Message-ID: <20180509144213.18032-1-benpeart@microsoft.com>

Add a new config status.renames setting to enable turning off rename detection during status. This setting will default to the value of diff.renames.

Add a new config status.renamelimit setting to to enable bounding the time spent finding out inexact renames during status. This setting will default to the value of diff.renamelimit.

Add status --no-renames command line option that enables overriding the config setting from the command line. Add --find-renames[=<n>] to enable detecting renames and optionaly setting the similarity index from the command line.

Origional-Patch-by: Alejandro Pauly <alpauly@microsoft.com>
Signed-off-by: Ben Peart <Ben.Peart@microsoft.com>
---

Notes:
    Base Ref:
    Web-Diff: https://github.com/benpeart/git/commit/aa977d2964
    Checkout: git fetch https://github.com/benpeart/git status-renames-v1 && git checkout aa977d2964

 Documentation/config.txt |  9 ++++
 builtin/commit.c         | 57 +++++++++++++++++++++++++
 diff.c                   |  2 +-
 diff.h                   |  1 +
 t/t7525-status-rename.sh | 90 ++++++++++++++++++++++++++++++++++++++++
 wt-status.c              | 12 ++++++
 wt-status.h              |  4 +-
 7 files changed, 173 insertions(+), 2 deletions(-)
 create mode 100644 t/t7525-status-rename.sh

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 2659153cb3..b79b83c587 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -3119,6 +3119,15 @@ status.displayCommentPrefix::
 	behavior of linkgit:git-status[1] in Git 1.8.4 and previous.
 	Defaults to false.
 
+status.renameLimit::
+	The number of files to consider when performing rename detection;
+	if not specified, defaults to the value of diff.renameLimit.
+
+status.renames::
+	Whether and how Git detects renames.  If set to "false",
+	rename detection is disabled. If set to "true", basic rename
+	detection is enabled.  Defaults to the value of diff.renames.
+
 status.showStash::
 	If set to true, linkgit:git-status[1] will display the number of
 	entries currently stashed away.
diff --git a/builtin/commit.c b/builtin/commit.c
index 5240f11225..a545096ddd 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -109,6 +109,10 @@ static int have_option_m;
 static struct strbuf message = STRBUF_INIT;
 
 static enum wt_status_format status_format = STATUS_FORMAT_UNSPECIFIED;
+static int diff_detect_rename = -1;
+static int status_detect_rename = -1;
+static int diff_rename_limit = -1;
+static int status_rename_limit = -1;
 
 static int opt_parse_porcelain(const struct option *opt, const char *arg, int unset)
 {
@@ -143,6 +147,16 @@ static int opt_parse_m(const struct option *opt, const char *arg, int unset)
 	return 0;
 }
 
+static int opt_parse_rename_score(const struct option *opt, const char *arg, int unset)
+{
+	const char **value = opt->value;
+	if (arg != NULL && *arg == '=')
+		arg = arg + 1;
+
+	*value = arg;
+	return 0;
+}
+
 static void determine_whence(struct wt_status *s)
 {
 	if (file_exists(git_path_merge_head()))
@@ -1259,11 +1273,29 @@ static int git_status_config(const char *k, const char *v, void *cb)
 			return error(_("Invalid untracked files mode '%s'"), v);
 		return 0;
 	}
+	if (!strcmp(k, "diff.renamelimit")) {
+		diff_rename_limit = git_config_int(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "status.renamelimit")) {
+		status_rename_limit = git_config_int(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "diff.renames")) {
+		diff_detect_rename = git_config_rename(k, v);
+		return 0;
+	}
+	if (!strcmp(k, "status.renames")) {
+		status_detect_rename = git_config_rename(k, v);
+		return 0;
+	}
 	return git_diff_ui_config(k, v, NULL);
 }
 
 int cmd_status(int argc, const char **argv, const char *prefix)
 {
+	static int no_renames = -1;
+	static const char *rename_score_arg = (const char *)-1;
 	static struct wt_status s;
 	int fd;
 	struct object_id oid;
@@ -1297,6 +1329,10 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 		  N_("ignore changes to submodules, optional when: all, dirty, untracked. (Default: all)"),
 		  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
 		OPT_COLUMN(0, "column", &s.colopts, N_("list untracked files in columns")),
+		OPT_BOOL(0, "no-renames", &no_renames, N_("do not detect renames")),
+		{ OPTION_CALLBACK, 'M', "find-renames", &rename_score_arg,
+		  N_("n"), N_("detect renames, optionally set similarity index"),
+		  PARSE_OPT_OPTARG, opt_parse_rename_score },
 		OPT_END(),
 	};
 
@@ -1336,6 +1372,27 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 	s.ignore_submodule_arg = ignore_submodule_arg;
 	s.status_format = status_format;
 	s.verbose = verbose;
+	s.detect_rename = no_renames >= 0 ? !no_renames :
+					  status_detect_rename >= 0 ? status_detect_rename :
+					  diff_detect_rename >= 0 ? diff_detect_rename :
+					  s.detect_rename;
+	if ((intptr_t)rename_score_arg != -1) {
+		s.detect_rename = DIFF_DETECT_RENAME;
+		if (rename_score_arg)
+			s.rename_score = parse_rename_score(&rename_score_arg);
+	}
+	s.rename_limit = status_rename_limit >= 0 ? status_rename_limit :
+					 diff_rename_limit >= 0 ? diff_rename_limit :
+					 s.rename_limit;
+
+	/*
+	 * We do not have logic to handle the detection of copies.  In
+	 * fact, it may not even make sense to add such logic: would we
+	 * really want a change to a base file to be propagated through
+	 * multiple other files by a merge?
+	 */
+	if (s.detect_rename > DIFF_DETECT_RENAME)
+		s.detect_rename = DIFF_DETECT_RENAME;
 
 	wt_status_collect(&s);
 
diff --git a/diff.c b/diff.c
index 1289df4b1f..5dfc24aa6d 100644
--- a/diff.c
+++ b/diff.c
@@ -177,7 +177,7 @@ static int parse_submodule_params(struct diff_options *options, const char *valu
 	return 0;
 }
 
-static int git_config_rename(const char *var, const char *value)
+int git_config_rename(const char *var, const char *value)
 {
 	if (!value)
 		return DIFF_DETECT_RENAME;
diff --git a/diff.h b/diff.h
index d29560f822..dedac472ca 100644
--- a/diff.h
+++ b/diff.h
@@ -324,6 +324,7 @@ extern int git_diff_ui_config(const char *var, const char *value, void *cb);
 extern void diff_setup(struct diff_options *);
 extern int diff_opt_parse(struct diff_options *, const char **, int, const char *);
 extern void diff_setup_done(struct diff_options *);
+extern int git_config_rename(const char *var, const char *value);
 
 #define DIFF_DETECT_RENAME	1
 #define DIFF_DETECT_COPY	2
diff --git a/t/t7525-status-rename.sh b/t/t7525-status-rename.sh
new file mode 100644
index 0000000000..311df8038a
--- /dev/null
+++ b/t/t7525-status-rename.sh
@@ -0,0 +1,90 @@
+#!/bin/sh
+
+test_description='git status rename detection options'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	echo 1 >original &&
+	git add . &&
+	git commit -m"Adding original file." &&
+	mv original renamed &&
+	echo 2 >> renamed &&
+	git add .
+'
+
+cat >.gitignore <<\EOF
+.gitignore
+expect*
+actual*
+EOF
+
+test_expect_success 'status no-options' '
+	git status >actual &&
+	test_i18ngrep "renamed:" actual
+'
+
+test_expect_success 'status --no-renames' '
+	git status --no-renames >actual &&
+	test_i18ngrep "deleted:" actual &&
+	test_i18ngrep "new file:" actual
+'
+
+test_expect_success 'status.renames inherits from diff.renames false' '
+	git -c diff.renames=false status >actual &&
+	test_i18ngrep "deleted:" actual &&
+	test_i18ngrep "new file:" actual
+'
+
+test_expect_success 'status.renames inherits from diff.renames true' '
+	git -c diff.renames=true status >actual &&
+	test_i18ngrep "renamed:" actual
+'
+
+test_expect_success 'status.renames overrides diff.renames false' '
+	git -c diff.renames=true -c status.renames=false status >actual &&
+	test_i18ngrep "deleted:" actual &&
+	test_i18ngrep "new file:" actual
+'
+
+test_expect_success 'status.renames overrides from diff.renames true' '
+	git -c diff.renames=false -c status.renames=true status >actual &&
+	test_i18ngrep "renamed:" actual
+'
+
+test_expect_success 'status status.renames=false' '
+	git -c status.renames=false status >actual &&
+	test_i18ngrep "deleted:" actual &&
+	test_i18ngrep "new file:" actual
+'
+
+test_expect_success 'status status.renames=true' '
+	git -c status.renames=true status >actual &&
+	test_i18ngrep "renamed:" actual
+'
+
+test_expect_success 'status config overriden' '
+	git -c status.renames=true status --no-renames >actual &&
+	test_i18ngrep "deleted:" actual &&
+	test_i18ngrep "new file:" actual
+'
+
+test_expect_success 'status score=100%' '
+	git status -M=100% >actual &&
+	test_i18ngrep "deleted:" actual &&
+	test_i18ngrep "new file:" actual &&
+
+	git status --find-rename=100% >actual &&
+	test_i18ngrep "deleted:" actual &&
+	test_i18ngrep "new file:" actual
+'
+
+test_expect_success 'status score=01%' '
+	git status -M=01% >actual &&
+	test_i18ngrep "renamed:" actual &&
+
+	git status --find-rename=01% >actual &&
+	test_i18ngrep "renamed:" actual
+'
+
+test_done
diff --git a/wt-status.c b/wt-status.c
index 32f3bcaebd..172f07cbb0 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -138,6 +138,9 @@ void wt_status_prepare(struct wt_status *s)
 	s->show_stash = 0;
 	s->ahead_behind_flags = AHEAD_BEHIND_UNSPECIFIED;
 	s->display_comment_prefix = 0;
+	s->detect_rename = -1;
+	s->rename_score = -1;
+	s->rename_limit = -1;
 }
 
 static void wt_longstatus_print_unmerged_header(struct wt_status *s)
@@ -592,6 +595,9 @@ static void wt_status_collect_changes_worktree(struct wt_status *s)
 	}
 	rev.diffopt.format_callback = wt_status_collect_changed_cb;
 	rev.diffopt.format_callback_data = s;
+	rev.diffopt.detect_rename = s->detect_rename >= 0 ? s->detect_rename : rev.diffopt.detect_rename;
+	rev.diffopt.rename_limit = s->rename_limit >= 0 ? s->rename_limit : rev.diffopt.rename_limit;
+	rev.diffopt.rename_score = s->rename_score >= 0 ? s->rename_score : rev.diffopt.rename_score;
 	copy_pathspec(&rev.prune_data, &s->pathspec);
 	run_diff_files(&rev, 0);
 }
@@ -625,6 +631,9 @@ static void wt_status_collect_changes_index(struct wt_status *s)
 	rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 	rev.diffopt.format_callback = wt_status_collect_updated_cb;
 	rev.diffopt.format_callback_data = s;
+	rev.diffopt.detect_rename = s->detect_rename >= 0 ? s->detect_rename : rev.diffopt.detect_rename;
+	rev.diffopt.rename_limit = s->rename_limit >= 0 ? s->rename_limit : rev.diffopt.rename_limit;
+	rev.diffopt.rename_score = s->rename_score >= 0 ? s->rename_score : rev.diffopt.rename_score;
 	copy_pathspec(&rev.prune_data, &s->pathspec);
 	run_diff_index(&rev, 1);
 }
@@ -982,6 +991,9 @@ static void wt_longstatus_print_verbose(struct wt_status *s)
 	setup_revisions(0, NULL, &rev, &opt);
 
 	rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
+	rev.diffopt.detect_rename = s->detect_rename >= 0 ? s->detect_rename : rev.diffopt.detect_rename;
+	rev.diffopt.rename_limit = s->rename_limit >= 0 ? s->rename_limit : rev.diffopt.rename_limit;
+	rev.diffopt.rename_score = s->rename_score >= 0 ? s->rename_score : rev.diffopt.rename_score;
 	rev.diffopt.file = s->fp;
 	rev.diffopt.close_file = 0;
 	/*
diff --git a/wt-status.h b/wt-status.h
index 430770b854..1673d146fa 100644
--- a/wt-status.h
+++ b/wt-status.h
@@ -89,7 +89,9 @@ struct wt_status {
 	int show_stash;
 	int hints;
 	enum ahead_behind_flags ahead_behind_flags;
-
+	int detect_rename;
+	int rename_score;
+	int rename_limit;
 	enum wt_status_format status_format;
 	unsigned char sha1_commit[GIT_MAX_RAWSZ]; /* when not Initial */
 

base-commit: a92ae92585d8db14b7871f760f157256cd96742c

-- 
2.17.0.windows.1