1/* ui-blame.c: functions for blame output
  2 *
  3 * Copyright (C) 2006-2017 cgit Development Team <cgit@lists.zx2c4.com>
  4 *
  5 * Licensed under GNU General Public License v2
  6 *   (see COPYING for full license text)
  7 */
  8
  9#include "cgit.h"
 10#include "ui-blame.h"
 11#include "html.h"
 12#include "ui-shared.h"
 13#include "argv-array.h"
 14#include "blame.h"
 15
 16
 17static char *emit_suspect_detail(struct blame_origin *suspect)
 18{
 19	struct commitinfo *info;
 20	struct strbuf detail = STRBUF_INIT;
 21
 22	info = cgit_parse_commit(suspect->commit);
 23
 24	strbuf_addf(&detail, "author  %s", info->author);
 25	if (!ctx.cfg.noplainemail)
 26		strbuf_addf(&detail, " %s", info->author_email);
 27	strbuf_addf(&detail, "  %s\n",
 28		    show_date(info->author_date, info->author_tz,
 29				    cgit_date_mode(DATE_ISO8601)));
 30
 31	strbuf_addf(&detail, "committer  %s", info->committer);
 32	if (!ctx.cfg.noplainemail)
 33		strbuf_addf(&detail, " %s", info->committer_email);
 34	strbuf_addf(&detail, "  %s\n\n",
 35		    show_date(info->committer_date, info->committer_tz,
 36				    cgit_date_mode(DATE_ISO8601)));
 37
 38	strbuf_addstr(&detail, info->subject);
 39
 40	cgit_free_commitinfo(info);
 41	return strbuf_detach(&detail, NULL);
 42}
 43
 44static void emit_blame_entry(struct blame_scoreboard *sb,
 45			     struct blame_entry *ent)
 46{
 47	struct blame_origin *suspect = ent->suspect;
 48	struct object_id *oid = &suspect->commit->object.oid;
 49	const char *numberfmt = "<a id='n%1$d' href='#n%1$d'>%1$d</a>\n";
 50	const char *cp, *cpend;
 51
 52	char *detail = emit_suspect_detail(suspect);
 53
 54	html("<tr><td class='sha1 lines'>");
 55	cgit_commit_link(find_unique_abbrev(oid->hash, DEFAULT_ABBREV), detail,
 56			 NULL, ctx.qry.head, oid_to_hex(oid), suspect->path);
 57	html("</td>\n");
 58
 59	free(detail);
 60
 61	if (ctx.cfg.enable_tree_linenumbers) {
 62		unsigned long lineno = ent->lno;
 63		html("<td class='linenumbers'><pre>");
 64		while (lineno < ent->lno + ent->num_lines)
 65			htmlf(numberfmt, ++lineno);
 66		html("</pre></td>\n");
 67	}
 68
 69	cp = blame_nth_line(sb, ent->lno);
 70	cpend = blame_nth_line(sb, ent->lno + ent->num_lines);
 71
 72	html("<td class='lines'><pre><code>");
 73	html_ntxt(cp, cpend - cp);
 74	html("</code></pre></td></tr>\n");
 75}
 76
 77struct walk_tree_context {
 78	char *curr_rev;
 79	int match_baselen;
 80	int state;
 81};
 82
 83static void print_object(const unsigned char *sha1, const char *path,
 84			 const char *basename, const char *rev)
 85{
 86	enum object_type type;
 87	unsigned long size;
 88	struct argv_array rev_argv = ARGV_ARRAY_INIT;
 89	struct rev_info revs;
 90	struct blame_scoreboard sb;
 91	struct blame_origin *o;
 92	struct blame_entry *ent = NULL;
 93
 94	type = sha1_object_info(sha1, &size);
 95	if (type == OBJ_BAD) {
 96		cgit_print_error_page(404, "Not found", "Bad object name: %s",
 97				      sha1_to_hex(sha1));
 98		return;
 99	}
100
101	argv_array_push(&rev_argv, "blame");
102	argv_array_push(&rev_argv, rev);
103	init_revisions(&revs, NULL);
104	revs.diffopt.flags.allow_textconv = 1;
105	setup_revisions(rev_argv.argc, rev_argv.argv, &revs, NULL);
106	init_scoreboard(&sb);
107	sb.revs = &revs;
108	setup_scoreboard(&sb, path, &o);
109	o->suspects = blame_entry_prepend(NULL, 0, sb.num_lines, o);
110	prio_queue_put(&sb.commits, o->commit);
111	blame_origin_decref(o);
112	sb.ent = NULL;
113	sb.path = path;
114	assign_blame(&sb, 0);
115	blame_sort_final(&sb);
116	blame_coalesce(&sb);
117
118	cgit_set_title_from_path(path);
119
120	cgit_print_layout_start();
121	htmlf("blob: %s (", sha1_to_hex(sha1));
122	cgit_plain_link("plain", NULL, NULL, ctx.qry.head, rev, path);
123	html(") (");
124	cgit_tree_link("tree", NULL, NULL, ctx.qry.head, rev, path);
125	html(")\n");
126
127	if (ctx.cfg.max_blob_size && size / 1024 > ctx.cfg.max_blob_size) {
128		htmlf("<div class='error'>blob size (%ldKB)"
129		      " exceeds display size limit (%dKB).</div>",
130		      size / 1024, ctx.cfg.max_blob_size);
131		return;
132	}
133
134	html("<table class='blame blob'>");
135	for (ent = sb.ent; ent; ) {
136		struct blame_entry *e = ent->next;
137		emit_blame_entry(&sb, ent);
138		free(ent);
139		ent = e;
140	}
141	html("</table>\n");
142	free((void *)sb.final_buf);
143
144	cgit_print_layout_end();
145}
146
147static int walk_tree(const unsigned char *sha1, struct strbuf *base,
148		     const char *pathname, unsigned mode, int stage,
149		     void *cbdata)
150{
151	struct walk_tree_context *walk_tree_ctx = cbdata;
152
153	if (base->len == walk_tree_ctx->match_baselen) {
154		if (S_ISREG(mode)) {
155			struct strbuf buffer = STRBUF_INIT;
156			strbuf_addbuf(&buffer, base);
157			strbuf_addstr(&buffer, pathname);
158			print_object(sha1, buffer.buf, pathname,
159				     walk_tree_ctx->curr_rev);
160			strbuf_release(&buffer);
161			walk_tree_ctx->state = 1;
162		} else if (S_ISDIR(mode)) {
163			walk_tree_ctx->state = 2;
164		}
165	} else if (base->len < INT_MAX
166			&& (int)base->len > walk_tree_ctx->match_baselen) {
167		walk_tree_ctx->state = 2;
168	} else if (S_ISDIR(mode)) {
169		return READ_TREE_RECURSIVE;
170	}
171	return 0;
172}
173
174static int basedir_len(const char *path)
175{
176	char *p = strrchr(path, '/');
177	if (p)
178		return p - path + 1;
179	return 0;
180}
181
182void cgit_print_blame(void)
183{
184	const char *rev = ctx.qry.sha1;
185	struct object_id oid;
186	struct commit *commit;
187	struct pathspec_item path_items = {
188		.match = ctx.qry.path,
189		.len = ctx.qry.path ? strlen(ctx.qry.path) : 0
190	};
191	struct pathspec paths = {
192		.nr = 1,
193		.items = &path_items
194	};
195	struct walk_tree_context walk_tree_ctx = {
196		.state = 0
197	};
198
199	if (!rev)
200		rev = ctx.qry.head;
201
202	if (get_oid(rev, &oid)) {
203		cgit_print_error_page(404, "Not found",
204			"Invalid revision name: %s", rev);
205		return;
206	}
207	commit = lookup_commit_reference(&oid);
208	if (!commit || parse_commit(commit)) {
209		cgit_print_error_page(404, "Not found",
210			"Invalid commit reference: %s", rev);
211		return;
212	}
213
214	walk_tree_ctx.curr_rev = xstrdup(rev);
215	walk_tree_ctx.match_baselen = (path_items.match) ?
216				       basedir_len(path_items.match) : -1;
217
218	read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree,
219		&walk_tree_ctx);
220	if (!walk_tree_ctx.state)
221		cgit_print_error_page(404, "Not found", "Not found");
222	else if (walk_tree_ctx.state == 2)
223		cgit_print_error_page(404, "No blame for folders",
224			"Blame is not available for folders.");
225
226	free(walk_tree_ctx.curr_rev);
227}