When there are lots of items to be cleaned, it is hard to see them all
in one screen. Show them in columns will solve this problem.

Signed-off-by: Jiang Xin <worldhello....@gmail.com>
Comments-by: Matthieu Moy <matthieu....@imag.fr>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 Documentation/config.txt |  4 ++++
 builtin/clean.c          | 49 +++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 44 insertions(+), 9 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 6e53f..e031b 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -955,6 +955,10 @@ column.branch::
        Specify whether to output branch listing in `git branch` in columns.
        See `column.ui` for details.
 
+column.clean::
+       Specify the layout when list items in `git clean -i`, which always
+       shows files and directories in columns. See `column.ui` for details.
+
 column.status::
        Specify whether to output untracked files in `git status` in columns.
        See `column.ui` for details.
diff --git a/builtin/clean.c b/builtin/clean.c
index 698fb..75cc6 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -13,10 +13,12 @@
 #include "refs.h"
 #include "string-list.h"
 #include "quote.h"
+#include "column.h"
 
 static int force = -1; /* unset */
 static int interactive;
 static struct string_list del_list = STRING_LIST_INIT_DUP;
+static unsigned int colopts;
 
 static const char *const builtin_clean_usage[] = {
        N_("git clean [-d] [-f] [-i] [-n] [-q] [-e <pattern>] [-x | -X] [--] 
<paths>..."),
@@ -31,8 +33,13 @@ static const char *msg_warn_remove_failed = N_("failed to 
remove %s");
 
 static int git_clean_config(const char *var, const char *value, void *cb)
 {
-       if (!strcmp(var, "clean.requireforce"))
+       if (!prefixcmp(var, "column."))
+               return git_column_config(var, value, "clean", &colopts);
+
+       if (!strcmp(var, "clean.requireforce")) {
                force = !git_config_bool(var, value);
+               return 0;
+       }
        return git_default_config(var, value, cb);
 }
 
@@ -144,21 +151,46 @@ static int remove_dirs(struct strbuf *path, const char 
*prefix, int force_flag,
        return ret;
 }
 
-static void interactive_main_loop(void)
+static void pretty_print_dels(void)
 {
-       struct strbuf confirm = STRBUF_INIT;
-       struct strbuf buf = STRBUF_INIT;
+       struct string_list list = STRING_LIST_INIT_DUP;
        struct string_list_item *item;
+       struct strbuf buf = STRBUF_INIT;
        const char *qname;
+       struct column_options copts;
+
+       for_each_string_list_item(item, &del_list) {
+               qname = quote_path_relative(item->string, NULL, &buf);
+               string_list_append(&list, qname);
+       }
+
+       /*
+        * always enable column display, we only consult column.*
+        * about layout strategy and stuff
+        */
+       colopts = (colopts & ~COL_ENABLE_MASK) | COL_ENABLED;
+       memset(&copts, 0, sizeof(copts));
+       copts.indent = "  ";
+       copts.padding = 2;
+       print_columns(&list, colopts, &copts);
+       putchar('\n');
+       strbuf_release(&buf);
+       string_list_clear(&list, 0);
+}
+
+static void interactive_main_loop(void)
+{
+       struct strbuf confirm = STRBUF_INIT;
 
        while (del_list.nr) {
                putchar('\n');
-               for_each_string_list_item(item, &del_list) {
-                       qname = quote_path_relative(item->string, NULL, &buf);
-                       printf(_(msg_would_remove), qname);
-               }
+               printf_ln(Q_("Would remove the following item:",
+                            "Would remove the following items:",
+                            del_list.nr));
                putchar('\n');
 
+               pretty_print_dels();
+
                printf(_("Remove [y/n]? "));
                if (strbuf_getline(&confirm, stdin, '\n') != EOF) {
                        strbuf_trim(&confirm);
@@ -184,7 +216,6 @@ static void interactive_main_loop(void)
                }
        }
 
-       strbuf_release(&buf);
        strbuf_release(&confirm);
 }
 
-- 
1.8.3.rc3.368.g7c798dd

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