tree-diff: rework diff_tree() to generate diffs for multiparent cases as well

diff --git a/help.c b/help.c
index 02ba043319932411e90121d4147f25395782dfb5..df7d16d7ce52ce9b9f274db92b24aa64bac56ebf 100644 (file)
--- a/help.c
+++ b/help.c
@@ -7,6 +7,7 @@
 #include "string-list.h"
 #include "column.h"
 #include "version.h"
+#include "refs.h"
 
 void add_cmdname(struct cmdnames *cmds, const char *name, int len)
 {
@@ -106,10 +107,7 @@ static int is_executable(const char *name)
            !S_ISREG(st.st_mode))
                return 0;
 
-#if defined(WIN32) || defined(__CYGWIN__)
-#if defined(__CYGWIN__)
-if ((st.st_mode & S_IXUSR) == 0)
-#endif
+#if defined(GIT_WINDOWS_NATIVE)
 {      /* cannot trust the executable bit, peek into the file instead */
        char buf[3] = { 0 };
        int n;
@@ -150,7 +148,7 @@ static void list_commands_in_dir(struct cmdnames *cmds,
        while ((de = readdir(dir)) != NULL) {
                int entlen;
 
-               if (prefixcmp(de->d_name, prefix))
+               if (!starts_with(de->d_name, prefix))
                        continue;
 
                strbuf_setlen(&buf, len);
@@ -257,7 +255,7 @@ static int git_unknown_cmd_config(const char *var, const char *value, void *cb)
        if (!strcmp(var, "help.autocorrect"))
                autocorrect = git_config_int(var,value);
        /* Also use aliases for command lookup */
-       if (!prefixcmp(var, "alias."))
+       if (starts_with(var, "alias."))
                add_cmdname(&aliases, var + 6, strlen(var + 6));
 
        return git_default_config(var, value, cb);
@@ -331,7 +329,7 @@ const char *help_unknown_cmd(const char *cmd)
                if ((n < ARRAY_SIZE(common_cmds)) && !cmp) {
                        /* Yes, this is one of the common commands */
                        n++; /* use the entry from common_cmds[] */
-                       if (!prefixcmp(candidate, cmd)) {
+                       if (starts_with(candidate, cmd)) {
                                /* Give prefix match a very good score */
                                main_cmds.names[i]->len = 0;
                                continue;
@@ -404,3 +402,52 @@ int cmd_version(int argc, const char **argv, const char *prefix)
        printf("git version %s\n", git_version_string);
        return 0;
 }
+
+struct similar_ref_cb {
+       const char *base_ref;
+       struct string_list *similar_refs;
+};
+
+static int append_similar_ref(const char *refname, const unsigned char *sha1,
+                             int flags, void *cb_data)
+{
+       struct similar_ref_cb *cb = (struct similar_ref_cb *)(cb_data);
+       char *branch = strrchr(refname, '/') + 1;
+       /* A remote branch of the same name is deemed similar */
+       if (starts_with(refname, "refs/remotes/") &&
+           !strcmp(branch, cb->base_ref))
+               string_list_append(cb->similar_refs,
+                                  refname + strlen("refs/remotes/"));
+       return 0;
+}
+
+static struct string_list guess_refs(const char *ref)
+{
+       struct similar_ref_cb ref_cb;
+       struct string_list similar_refs = STRING_LIST_INIT_NODUP;
+
+       ref_cb.base_ref = ref;
+       ref_cb.similar_refs = &similar_refs;
+       for_each_ref(append_similar_ref, &ref_cb);
+       return similar_refs;
+}
+
+void help_unknown_ref(const char *ref, const char *cmd, const char *error)
+{
+       int i;
+       struct string_list suggested_refs = guess_refs(ref);
+
+       fprintf_ln(stderr, _("%s: %s - %s"), cmd, ref, error);
+
+       if (suggested_refs.nr > 0) {
+               fprintf_ln(stderr,
+                          Q_("\nDid you mean this?",
+                             "\nDid you mean one of these?",
+                             suggested_refs.nr));
+               for (i = 0; i < suggested_refs.nr; i++)
+                       fprintf(stderr, "\t%s\n", suggested_refs.items[i].string);
+       }
+
+       string_list_clear(&suggested_refs, 0);
+       exit(1);
+}