allow blob extract blobs by head/path combination

 If blob is invoked with no id=, it tries to look up h= and search for path= in
 there. Once found, proceed as normal, otherwise, fail as normal.

Signed-off-by: Michael Krelin <hacker@klever.net>

3 files changed, 35 insertions, 6 deletions

diff --git a/cmd.c b/cmd.c
index 4edca6b..fe0ea8f 100644
--- a/cmd.c
+++ b/cmd.c
@@ -1,132 +1,132 @@
 /* cmd.c: the cgit command dispatcher
  *
  * Copyright (C) 2008 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 #include "cmd.h"
 #include "cache.h"
 #include "ui-shared.h"
 #include "ui-blob.h"
 #include "ui-commit.h"
 #include "ui-diff.h"
 #include "ui-log.h"
 #include "ui-patch.h"
 #include "ui-refs.h"
 #include "ui-repolist.h"
 #include "ui-snapshot.h"
 #include "ui-summary.h"
 #include "ui-tag.h"
 #include "ui-tree.h"
 
 static void about_fn(struct cgit_context *ctx)
 {
 	if (ctx->repo)
 		cgit_print_repo_readme();
 	else
 		cgit_print_site_readme();
 }
 
 static void blob_fn(struct cgit_context *ctx)
 {
-	cgit_print_blob(ctx->qry.sha1, ctx->qry.path);
+	cgit_print_blob(ctx->qry.sha1, ctx->qry.path, ctx->qry.head);
 }
 
 static void commit_fn(struct cgit_context *ctx)
 {
 	cgit_print_commit(ctx->qry.sha1);
 }
 
 static void diff_fn(struct cgit_context *ctx)
 {
 	cgit_print_diff(ctx->qry.sha1, ctx->qry.sha2, ctx->qry.path);
 }
 
 static void log_fn(struct cgit_context *ctx)
 {
 	cgit_print_log(ctx->qry.sha1, ctx->qry.ofs, ctx->cfg.max_commit_count,
 		       ctx->qry.grep, ctx->qry.search, ctx->qry.path, 1);
 }
 
 static void ls_cache_fn(struct cgit_context *ctx)
 {
 	ctx->page.mimetype = "text/plain";
 	ctx->page.filename = "ls-cache.txt";
 	cgit_print_http_headers(ctx);
 	cache_ls(ctx->cfg.cache_root);
 }
 
 static void repolist_fn(struct cgit_context *ctx)
 {
 	cgit_print_repolist();
 }
 
 static void patch_fn(struct cgit_context *ctx)
 {
 	cgit_print_patch(ctx->qry.sha1);
 }
 
 static void refs_fn(struct cgit_context *ctx)
 {
 	cgit_print_refs();
 }
 
 static void snapshot_fn(struct cgit_context *ctx)
 {
 	cgit_print_snapshot(ctx->qry.head, ctx->qry.sha1,
 			    cgit_repobasename(ctx->repo->url), ctx->qry.path,
 			    ctx->repo->snapshots);
 }
 
 static void summary_fn(struct cgit_context *ctx)
 {
 	cgit_print_summary();
 }
 
 static void tag_fn(struct cgit_context *ctx)
 {
 	cgit_print_tag(ctx->qry.sha1);
 }
 
 static void tree_fn(struct cgit_context *ctx)
 {
 	cgit_print_tree(ctx->qry.sha1, ctx->qry.path);
 }
 
 #define def_cmd(name, want_repo, want_layout) \
 	{#name, name##_fn, want_repo, want_layout}
 
 struct cgit_cmd *cgit_get_cmd(struct cgit_context *ctx)
 {
 	static struct cgit_cmd cmds[] = {
 		def_cmd(about, 0, 1),
 		def_cmd(blob, 1, 0),
 		def_cmd(commit, 1, 1),
 		def_cmd(diff, 1, 1),
 		def_cmd(log, 1, 1),
 		def_cmd(ls_cache, 0, 0),
 		def_cmd(patch, 1, 0),
 		def_cmd(refs, 1, 1),
 		def_cmd(repolist, 0, 0),
 		def_cmd(snapshot, 1, 0),
 		def_cmd(summary, 1, 1),
 		def_cmd(tag, 1, 1),
 		def_cmd(tree, 1, 1),
 	};
 	int i;
 
 	if (ctx->qry.page == NULL) {
 		if (ctx->repo)
 			ctx->qry.page = "summary";
 		else
 			ctx->qry.page = "repolist";
 	}
 
 	for(i = 0; i < sizeof(cmds)/sizeof(*cmds); i++)
 		if (!strcmp(ctx->qry.page, cmds[i].name))
 			return &cmds[i];
 	return NULL;
 }
diff --git a/ui-blob.c b/ui-blob.c
index ab44659..dd1bbce 100644
--- a/ui-blob.c
+++ b/ui-blob.c
@@ -1,43 +1,72 @@
 /* ui-blob.c: show blob content
  *
  * Copyright (C) 2008 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 #include "html.h"
 #include "ui-shared.h"
 
-void cgit_print_blob(const char *hex, char *path)
+static char *match_path;
+static unsigned char *matched_sha1;
+
+static int walk_tree(const unsigned char *sha1, const char *base,int baselen, const char *pathname, unsigned mode, int stage) {
+	if(strncmp(base,match_path,baselen)
+		|| strcmp(match_path+baselen,pathname) )
+		return READ_TREE_RECURSIVE;
+	memmove(matched_sha1,sha1,20);
+	return 0;
+}
+
+void cgit_print_blob(const char *hex, char *path, const char *head)
 {
 
 	unsigned char sha1[20];
 	enum object_type type;
 	unsigned char *buf;
 	unsigned long size;
+	struct commit *commit;
+	const char *paths[] = {path, NULL};
 
-	if (get_sha1_hex(hex, sha1)){
-		cgit_print_error(fmt("Bad hex value: %s", hex));
-	        return;
+	if (hex) {
+		if (get_sha1_hex(hex, sha1)){
+			cgit_print_error(fmt("Bad hex value: %s", hex));
+			return;
+		}
+	} else {
+		if (get_sha1(head,sha1)) {
+			cgit_print_error(fmt("Bad ref: %s", head));
+			return;
+		}
 	}
 
 	type = sha1_object_info(sha1, &size);
+
+	if((!hex) && type == OBJ_COMMIT && path) {
+		commit = lookup_commit_reference(sha1);
+		match_path = path;
+		matched_sha1 = sha1;
+		read_tree_recursive(commit->tree, NULL, 0, 0, paths, walk_tree);
+		type = sha1_object_info(sha1,&size);
+	}
+
 	if (type == OBJ_BAD) {
 		cgit_print_error(fmt("Bad object name: %s", hex));
 		return;
 	}
 
 	buf = read_sha1_file(sha1, &type, &size);
 	if (!buf) {
 		cgit_print_error(fmt("Error reading object %s", hex));
 		return;
 	}
 
 	buf[size] = '\0';
 	ctx.page.mimetype = NULL;
 	ctx.page.filename = path;
 	cgit_print_http_headers(&ctx);
 	write(htmlfd, buf, size);
 }
diff --git a/ui-blob.h b/ui-blob.h
index 5a920a8..dad275a 100644
--- a/ui-blob.h
+++ b/ui-blob.h
@@ -1,6 +1,6 @@
 #ifndef UI_BLOB_H
 #define UI_BLOB_H
 
-extern void cgit_print_blob(const char *hex, char *path);
+extern void cgit_print_blob(const char *hex, char *path, const char *head);
 
 #endif /* UI_BLOB_H */