textconv: support for cat_file

Make the textconv_object function public, and add --textconv option to cat-file
to perform conversion on blob objects. Using --textconv implies that we are
working on a blob.
As files drivers need to be initialized, a new config is required in addition
to git_default_config. Therefore git_cat_file_config() is introduced

Signed-off-by: Clément Poulain <clement.poulain@ensimag.imag.fr>
Signed-off-by: Diane Gasselin <diane.gasselin@ensimag.imag.fr>
Signed-off-by: Axel Bonnet <axel.bonnet@ensimag.imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin.h b/builtin.h
index 5c887ef..5a1dba0 100644 (file)
--- a/builtin.h
+++ b/builtin.h
@@ -36,6 +36,8 @@ void finish_copy_notes_for_rewrite(struct notes_rewrite_cfg *c);
 
 extern int check_pager_config(const char *cmd);
 
+extern int textconv_object(const char *path, const unsigned char *sha1, char **buf, unsigned long *buf_size);
+
 extern int cmd_add(int argc, const char **argv, const char *prefix);
 extern int cmd_annotate(int argc, const char **argv, const char *prefix);
 extern int cmd_apply(int argc, const char **argv, const char *prefix);

diff --git a/builtin/blame.c b/builtin/blame.c
index 7bbe761..2e63648 100644 (file)
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -91,10 +91,10 @@ struct origin {
  * if the textconv driver exists.
  * Return 1 if the conversion succeeds, 0 otherwise.
  */
-static int textconv_object(const char *path,
-                          const unsigned char *sha1,
-                          char **buf,
-                          unsigned long *buf_size)
+int textconv_object(const char *path,
+                   const unsigned char *sha1,
+                   char **buf,
+                   unsigned long *buf_size)
 {
        struct diff_filespec *df;
        struct userdiff_driver *textconv;

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index a933eaa..cada5d2 100644 (file)
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -9,6 +9,8 @@
 #include "tree.h"
 #include "builtin.h"
 #include "parse-options.h"
+#include "diff.h"
+#include "userdiff.h"
 
 #define BATCH 1
 #define BATCH_CHECK 2
@@ -84,10 +86,11 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 {
        unsigned char sha1[20];
        enum object_type type;
-       void *buf;
+       char *buf;
        unsigned long size;
+       struct object_context obj_context;
 
-       if (get_sha1(obj_name, sha1))
+       if (get_sha1_with_context(obj_name, sha1, &obj_context))
                die("Not a valid object name %s", obj_name);
 
        buf = NULL;
@@ -132,6 +135,17 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 
                /* otherwise just spit out the data */
                break;
+
+       case 'c':
+               if (!obj_context.path[0])
+                       die("git cat-file --textconv %s: <object> must be <sha1:path>",
+                           obj_name);
+
+               if (!textconv_object(obj_context.path, sha1, &buf, &size))
+                       die("git cat-file --textconv: unable to run textconv on %s",
+                           obj_name);
+               break;
+
        case 0:
                buf = read_object_with_reference(sha1, exp_type, &size, NULL);
                break;
@@ -201,11 +215,25 @@ static int batch_objects(int print_contents)
 }
 
 static const char * const cat_file_usage[] = {
-       "git cat-file (-t|-s|-e|-p|<type>) <object>",
+       "git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>",
        "git cat-file (--batch|--batch-check) < <list_of_objects>",
        NULL
 };
 
+static int git_cat_file_config(const char *var, const char *value, void *cb)
+{
+       switch (userdiff_config(var, value)) {
+       case 0:
+               break;
+       case -1:
+               return -1;
+       default:
+               return 0;
+       }
+
+       return git_default_config(var, value, cb);
+}
+
 int cmd_cat_file(int argc, const char **argv, const char *prefix)
 {
        int opt = 0, batch = 0;
@@ -218,6 +246,8 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
                OPT_SET_INT('e', NULL, &opt,
                            "exit with zero when there's no error", 'e'),
                OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'),
+               OPT_SET_INT(0, "textconv", &opt,
+                           "for blob objects, run textconv on object's content", 'c'),
                OPT_SET_INT(0, "batch", &batch,
                            "show info and content of objects fed from the standard input",
                            BATCH),
@@ -227,7 +257,7 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
                OPT_END()
        };
 
-       git_config(git_default_config, NULL);
+       git_config(git_cat_file_config, NULL);
 
        if (argc != 3 && argc != 2)
                usage_with_options(cat_file_usage, options);