add -s option to 'got status' which acts as a status code filter

Advantages over using grep are that the list of codes is validated against
a list of known status codes, and that it is easier to match staged files
which can display status codes in one or both of two columns.

Prompted by feedback from krw@
 
ok?

diff 0992025a741c3dd4b72424227e6fb10610584837 bf13e347e15d6f720f2aa2cf9c2445b1833112df
blob - f9e5cd6f3135e7407b0775077c23ca64fd500590
blob + 8f049181b8b59970cb560bc5e0623a8015811931
--- got/got.1
+++ got/got.1
@@ -607,7 +607,7 @@ branch will be used.
 .It Cm up
 Short alias for
 .Cm update .
-.It Cm status Op Ar path ...
+.It Cm status Oo Fl s Ar status-codes Oc Op Ar path ...
 Show the current modification status of files in a work tree,
 using the following status codes:
 .Bl -column YXZ description
@@ -646,6 +646,20 @@ Changes created on top of staged changes are indicated
 .It MA Ta file was modified after having been staged for addition
 .El
 .Pp
+The options for
+.Cm got status
+are as follows:
+.Bl -tag -width Ds
+.It Fl s Ar status-codes
+Only show files with a modification status matching any of the
+single-character status codes contained in the
+.Ar status-codes
+argument.
+Any combination of codes from the above list of possible status codes
+may be specified.
+For staged files, status codes displayed in either column will be matched.
+.El
+.Pp
 For compatibility with
 .Xr cvs 1
 and
@@ -1955,8 +1969,11 @@ Check out a work tree from the Git repository to /usr/
 .Pp
 View local changes in a work tree directory:
 .Pp
-.Dl $ got status
 .Dl $ got diff | less
+.Pp
+In a work tree, display files in a potentially problematic state:
+.Pp
+.Dl $ got status -s 'C!~?'
 .Pp
 Interactively revert selected local changes in a work tree directory:
 .Pp
blob - 7d306e82e5e51906ac29b7b1df6b2cc05f281e95
blob + 93fe92b8cf1c50517bdedc66c2b0be234cb08074
--- got/got.c
+++ got/got.c
@@ -4642,7 +4642,8 @@ done:
 __dead static void
 usage_status(void)
 {
-	fprintf(stderr, "usage: %s status [path ...]\n", getprogname());
+	fprintf(stderr, "usage: %s status [-s status-codes ] [path ...]\n",
+	    getprogname());
 	exit(1);
 }
 
@@ -4654,6 +4655,18 @@ print_status(void *arg, unsigned char status, unsigned
 {
 	if (status == staged_status && (status == GOT_STATUS_DELETE))
 		status = GOT_STATUS_NO_CHANGE;
+	if (arg) {
+		char *status_codes = arg;
+		size_t ncodes = strlen(status_codes);
+		int i;
+		for (i = 0; i < ncodes ; i++) {
+			if (status == status_codes[i] ||
+			    staged_status == status_codes[i])
+				break;
+		}
+		if (i == ncodes)
+			return NULL;
+	}
 	printf("%c%c %s\n", status, staged_status, path);
 	return NULL;
 }
@@ -4664,15 +4677,35 @@ cmd_status(int argc, char *argv[])
 	const struct got_error *error = NULL;
 	struct got_repository *repo = NULL;
 	struct got_worktree *worktree = NULL;
-	char *cwd = NULL;
+	char *cwd = NULL, *status_codes = NULL;;
 	struct got_pathlist_head paths;
 	struct got_pathlist_entry *pe;
-	int ch;
+	int ch, i;
 
 	TAILQ_INIT(&paths);
 
-	while ((ch = getopt(argc, argv, "")) != -1) {
+	while ((ch = getopt(argc, argv, "s:")) != -1) {
 		switch (ch) {
+		case 's':
+			for (i = 0; i < strlen(optarg); i++) {
+				switch (optarg[i]) {
+				case GOT_STATUS_MODIFY:
+				case GOT_STATUS_ADD:
+				case GOT_STATUS_DELETE:
+				case GOT_STATUS_CONFLICT:
+				case GOT_STATUS_MISSING:
+				case GOT_STATUS_OBSTRUCTED:
+				case GOT_STATUS_UNVERSIONED:
+				case GOT_STATUS_MODE_CHANGE:
+				case GOT_STATUS_NONEXISTENT:
+					break;
+				default:
+					errx(1, "invalid status code '%c'",
+					    optarg[i]);
+				}
+			}
+			status_codes = optarg;
+			break;
 		default:
 			usage_status();
 			/* NOTREACHED */
@@ -4714,8 +4747,8 @@ cmd_status(int argc, char *argv[])
 	if (error)
 		goto done;
 
-	error = got_worktree_status(worktree, &paths, repo, print_status, NULL,
-	    check_cancelled, NULL);
+	error = got_worktree_status(worktree, &paths, repo, print_status,
+	    status_codes, check_cancelled, NULL);
 done:
 	TAILQ_FOREACH(pe, &paths, entry)
 		free((char *)pe->path);
blob - 57f0661d15b479c61bf4063f60ad7de2ec7c8499
blob + 46a185350db6563b65ec99ac16de6b202254c8ad
--- regress/cmdline/status.sh
+++ regress/cmdline/status.sh
@@ -634,6 +634,122 @@ function test_status_gitignore {
 	test_done "$testroot" "$ret"
 }
 
+function test_status_status_code {
+	local testroot=`test_init status_status_code`
+
+	got checkout $testroot/repo $testroot/wt > /dev/null
+	ret="$?"
+	if [ "$ret" != "0" ]; then
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	echo "modified alpha" > $testroot/wt/alpha
+	(cd $testroot/wt && got rm beta >/dev/null)
+	echo "unversioned file" > $testroot/wt/foo
+	rm $testroot/wt/epsilon/zeta
+	touch $testroot/wt/beta
+	echo "new file" > $testroot/wt/new
+	(cd $testroot/wt && got add new >/dev/null)
+
+	(cd $testroot/wt && got status -s xDM \
+		> $testroot/stdout 2> $testroot/stderr)
+	ret="$?"
+	if [ "$ret" == "0" ]; then
+		echo "status succeeded unexpectedly" >&2
+		test_done "$testroot" "1"
+		return 1
+	fi
+
+	echo "got: invalid status code 'x'" > $testroot/stderr.expected
+	cmp -s $testroot/stderr.expected $testroot/stderr
+	ret="$?"
+	if [ "$ret" != "0" ]; then
+		diff -u $testroot/stderr.expected $testroot/stderr
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	echo 'M  alpha' > $testroot/stdout.expected
+	(cd $testroot/wt && got status -s M > $testroot/stdout)
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret="$?"
+	if [ "$ret" != "0" ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	echo 'D  beta' > $testroot/stdout.expected
+	(cd $testroot/wt && got status -s D > $testroot/stdout)
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret="$?"
+	if [ "$ret" != "0" ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	echo '!  epsilon/zeta' > $testroot/stdout.expected
+	echo '?  foo' >> $testroot/stdout.expected
+	(cd $testroot/wt && got status -s \!? > $testroot/stdout)
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret="$?"
+	if [ "$ret" != "0" ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	echo 'A  new' > $testroot/stdout.expected
+	(cd $testroot/wt && got status -s A > $testroot/stdout)
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret="$?"
+	if [ "$ret" != "0" ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	(cd $testroot/wt && got stage new > $testroot/stdout)
+
+	echo ' A new' > $testroot/stdout.expected
+	(cd $testroot/wt && got status -s A > $testroot/stdout)
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret="$?"
+	if [ "$ret" != "0" ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	echo 'changed file new' > $testroot/wt/new
+
+	echo 'MA new' > $testroot/stdout.expected
+	(cd $testroot/wt && got status -s A > $testroot/stdout)
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret="$?"
+	if [ "$ret" != "0" ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	echo 'M  alpha' > $testroot/stdout.expected
+	echo 'MA new' >> $testroot/stdout.expected
+	(cd $testroot/wt && got status -s M > $testroot/stdout)
+	cmp -s $testroot/stdout.expected $testroot/stdout
+	ret="$?"
+	if [ "$ret" != "0" ]; then
+		diff -u $testroot/stdout.expected $testroot/stdout
+		test_done "$testroot" "$ret"
+		return 1
+	fi
+
+	test_done "$testroot" "$ret"
+}
+
+
 test_parseargs "$@"
 run_test test_status_basic
 run_test test_status_subdir_no_mods
@@ -649,3 +765,4 @@ run_test test_status_empty_dir_unversioned_file
 run_test test_status_many_paths
 run_test test_status_cvsignore
 run_test test_status_gitignore
+run_test test_status_status_code