[PATCH v9 2/9] git-clean: add support for -i/--interactive

[Jiang Xin <worldhello.net@gmail.com>]

Show what would be done and the user must confirm before actually
cleaning.

    Would remove ...
    Would remove ...
    Would remove ...

    Remove [y/n]?

Press "y" to start cleaning, and press "n" if you want to abort.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
---
 Documentation/git-clean.txt | 10 ++++++--
 builtin/clean.c             | 61 +++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 64 insertions(+), 7 deletions(-)

diff --git a/Documentation/git-clean.txt b/Documentation/git-clean.txt
index bdc3a..186e34 100644
--- a/Documentation/git-clean.txt
+++ b/Documentation/git-clean.txt
@@ -8,7 +8,7 @@ git-clean - Remove untracked files from the working tree
 SYNOPSIS
 --------
 [verse]
-'git clean' [-d] [-f] [-n] [-q] [-e <pattern>] [-x | -X] [--] <path>...
+'git clean' [-d] [-f] [-i] [-n] [-q] [-e <pattern>] [-x | -X] [--] <path>...
 
 DESCRIPTION
 -----------
@@ -34,7 +34,13 @@ OPTIONS
 -f::
 --force::
 	If the Git configuration variable clean.requireForce is not set
-	to false, 'git clean' will refuse to run unless given -f or -n.
+	to false, 'git clean' will refuse to run unless given -f, -n or
+	-i.
+
+-i::
+--interactive::
+	Show what would be done and the user must confirm before actually
+	cleaning.
 
 -n::
 --dry-run::
diff --git a/builtin/clean.c b/builtin/clean.c
index ccd4..127463 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -15,10 +15,11 @@
 #include "quote.h"
 
 static int force = -1; /* unset */
+static int interactive;
 static struct string_list del_list = STRING_LIST_INIT_DUP;
 
 static const char *const builtin_clean_usage[] = {
-	N_("git clean [-d] [-f] [-n] [-q] [-e <pattern>] [-x | -X] [--] <paths>..."),
+	N_("git clean [-d] [-f] [-i] [-n] [-q] [-e <pattern>] [-x | -X] [--] <paths>..."),
 	NULL
 };
 
@@ -185,6 +186,50 @@ static const char *path_relative(const char *in, const char *prefix)
 	return buf;
 }
 
+static void interactive_main_loop(void)
+{
+	struct strbuf confirm = STRBUF_INIT;
+	struct strbuf buf = STRBUF_INIT;
+	struct string_list_item *item;
+	const char *qname;
+
+	while (del_list.nr) {
+		putchar('\n');
+		for_each_string_list_item(item, &del_list) {
+			qname = quote_path_relative(item->string, -1, &buf, NULL);
+			printf(_(msg_would_remove), qname);
+		}
+		putchar('\n');
+
+		printf(_("Remove [y/n]? "));
+		if (strbuf_getline(&confirm, stdin, '\n') != EOF) {
+			strbuf_trim(&confirm);
+		} else {
+			/* Ctrl-D is the same as "quit" */
+			string_list_clear(&del_list, 0);
+			putchar('\n');
+			printf_ln("Bye.");
+			break;
+		}
+
+		if (confirm.len) {
+			if (!strncasecmp(confirm.buf, "yes", confirm.len)) {
+				break;
+			} else if (!strncasecmp(confirm.buf, "no", confirm.len) ||
+				   !strncasecmp(confirm.buf, "quit", confirm.len)) {
+				string_list_clear(&del_list, 0);
+				printf_ln("Bye.");
+				break;
+			} else {
+				continue;
+			}
+		}
+	}
+
+	strbuf_release(&buf);
+	strbuf_release(&confirm);
+}
+
 int cmd_clean(int argc, const char **argv, const char *prefix)
 {
 	int i, res;
@@ -204,6 +249,7 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
 		OPT__QUIET(&quiet, N_("do not print names of files removed")),
 		OPT__DRY_RUN(&dry_run, N_("dry run")),
 		OPT__FORCE(&force, N_("force")),
+		OPT_BOOL('i', "interactive", &interactive, N_("interactive cleaning")),
 		OPT_BOOLEAN('d', NULL, &remove_directories,
 				N_("remove whole directories")),
 		{ OPTION_CALLBACK, 'e', "exclude", &exclude_list, N_("pattern"),
@@ -230,12 +276,16 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
 	if (ignored && ignored_only)
 		die(_("-x and -X cannot be used together"));
 
-	if (!dry_run && !force) {
+	if (interactive) {
+		if (!isatty(0) || !isatty(1))
+			die(_("interactive clean can not run without a valid tty; "
+				  "refusing to clean"));
+	} else if (!dry_run && !force) {
 		if (config_set)
-			die(_("clean.requireForce set to true and neither -n nor -f given; "
+			die(_("clean.requireForce set to true and neither -i, -n nor -f given; "
 				  "refusing to clean"));
 		else
-			die(_("clean.requireForce defaults to true and neither -n nor -f given; "
+			die(_("clean.requireForce defaults to true and neither -i, -n nor -f given; "
 				  "refusing to clean"));
 	}
 
@@ -309,7 +359,8 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
 		}
 	}
 
-	/* TODO: do interactive git-clean here, which will modify del_list */
+	if (interactive && del_list.nr > 0)
+		interactive_main_loop();
 
 	for_each_string_list_item(item, &del_list) {
 		struct stat st;
-- 
1.8.3.rc1.404.gb9fcf3e