abbrev cleanup: use symbolic constants

The minimum length of abbreviated object name was hardcoded in
different places to be 4, risking inconsistencies in the future.
Also there were three different "default abbreviation
precision".  Use two C preprocessor symbols to clean up this
mess.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/cache.h b/cache.h
index 1e8e27f7b33fb9adca642eab77e14f452bd2e4cb..bdbe2d683e18237e2a797573e45b9c38383eaf04 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -221,6 +221,9 @@ extern int has_pack_file(const unsigned char *sha1);
 extern int has_pack_index(const unsigned char *sha1);
 
 /* Convert to/from hex/sha1 representation */
+#define MINIMUM_ABBREV 4
+#define DEFAULT_ABBREV 7
+
 extern int get_sha1(const char *str, unsigned char *sha1);
 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 extern char *sha1_to_hex(const unsigned char *sha1);   /* static buffer result! */

diff --git a/describe.c b/describe.c
index 4866510eafa19fbfe74e11d20e5d2d1a0a44fd4b..ff65742615cb6862d3699e4f301d671a7eadc2e2 100644 (file)
--- a/describe.c
+++ b/describe.c
@@ -11,7 +11,6 @@ static const char describe_usage[] =
 static int all = 0;    /* Default to annotated tags only */
 static int tags = 0;   /* But allow any tags if --tags is specified */
 
-#define DEFAULT_ABBREV 8 /* maybe too many */
 static int abbrev = DEFAULT_ABBREV;
 
 static int names = 0, allocs = 0;
@@ -155,7 +154,7 @@ int main(int argc, char **argv)
                        tags = 1;
                else if (!strncmp(arg, "--abbrev=", 9)) {
                        abbrev = strtoul(arg + 9, NULL, 10);
-                       if (abbrev < 4 || 40 <= abbrev)
+                       if (abbrev < MINIMUM_ABBREV || 40 <= abbrev)
                                abbrev = DEFAULT_ABBREV;
                }
                else

diff --git a/diff.c b/diff.c
index 17d68fa699f7c88aef8e6c1a0812575bfaec70e1..69767b9de97f27306032d7af1aa05d0bdbf5315f 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -723,7 +723,7 @@ static void run_diff(struct diff_filepair *p, struct diff_options *o)
 
        if (memcmp(one->sha1, two->sha1, 20)) {
                char one_sha1[41];
-               int abbrev = o->full_index ? 40 : DIFF_DEFAULT_INDEX_ABBREV;
+               int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
                memcpy(one_sha1, sha1_to_hex(one->sha1), 41);
 
                len += snprintf(msg + len, sizeof(msg) - len,
@@ -846,7 +846,7 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
        else if (!strcmp(arg, "--find-copies-harder"))
                options->find_copies_harder = 1;
        else if (!strcmp(arg, "--abbrev"))
-               options->abbrev = DIFF_DEFAULT_ABBREV;
+               options->abbrev = DEFAULT_ABBREV;
        else if (!strncmp(arg, "--abbrev=", 9))
                options->abbrev = strtoul(arg + 9, NULL, 10);
        else

diff --git a/diff.h b/diff.h
index 5696f2aff0644f331507679e0a58d7fcdc3501ec..122c8143a3b9274380f1a66785b3d7952e8609dd 100644 (file)
--- a/diff.h
+++ b/diff.h
@@ -88,9 +88,6 @@ extern int diff_setup_done(struct diff_options *);
 
 #define DIFF_PICKAXE_ALL       1
 
-#define DIFF_DEFAULT_INDEX_ABBREV      7 /* hex digits */
-#define DIFF_DEFAULT_ABBREV    7 /* hex digits */
-
 extern void diffcore_std(struct diff_options *);
 
 extern void diffcore_std_no_resolve(struct diff_options *);

diff --git a/sha1_name.c b/sha1_name.c
index e18a96d772f4186cfaffe6053a3f1664a9fdad3f..ba0747c84dd1298093101e8726f2ee21d7ed23e6 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -155,7 +155,7 @@ static int get_short_sha1(const char *name, int len, unsigned char *sha1,
        char canonical[40];
        unsigned char res[20];
 
-       if (len < 4)
+       if (len < MINIMUM_ABBREV)
                return -1;
        memset(res, 0, 20);
        memset(canonical, 'x', 40);