worktree: add --quiet option

diff --git a/read-cache.c b/read-cache.c
index 56eac508362f272e5d777c98b7f31c0f043c1d89..880849fc8ad8454a756ac0849dff288ad8f38eaa 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -6,6 +6,8 @@
 #define NO_THE_INDEX_COMPATIBILITY_MACROS
 #include "cache.h"
 #include "config.h"
+#include "diff.h"
+#include "diffcore.h"
 #include "tempfile.h"
 #include "lockfile.h"
 #include "cache-tree.h"
@@ -2120,6 +2122,44 @@ int unmerged_index(const struct index_state *istate)
        return 0;
 }
 
+int index_has_changes(const struct index_state *istate,
+                     struct tree *tree,
+                     struct strbuf *sb)
+{
+       struct object_id cmp;
+       int i;
+
+       if (istate != &the_index) {
+               BUG("index_has_changes cannot yet accept istate != &the_index; do_diff_cache needs updating first.");
+       }
+       if (tree)
+               cmp = tree->object.oid;
+       if (tree || !get_oid_tree("HEAD", &cmp)) {
+               struct diff_options opt;
+
+               diff_setup(&opt);
+               opt.flags.exit_with_status = 1;
+               if (!sb)
+                       opt.flags.quick = 1;
+               do_diff_cache(&cmp, &opt);
+               diffcore_std(&opt);
+               for (i = 0; sb && i < diff_queued_diff.nr; i++) {
+                       if (i)
+                               strbuf_addch(sb, ' ');
+                       strbuf_addstr(sb, diff_queued_diff.queue[i]->two->path);
+               }
+               diff_flush(&opt);
+               return opt.flags.has_changes != 0;
+       } else {
+               for (i = 0; sb && i < istate->cache_nr; i++) {
+                       if (i)
+                               strbuf_addch(sb, ' ');
+                       strbuf_addstr(sb, istate->cache[i]->name);
+               }
+               return !!istate->cache_nr;
+       }
+}
+
 #define WRITE_BUFFER_SIZE 8192
 static unsigned char write_buffer[WRITE_BUFFER_SIZE];
 static unsigned long write_buffer_len;