/* ui-diff.c: show diff between two blobs
 *
 * Copyright (C) 2006 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"
#include "ui-ssdiff.h"

unsigned char old_rev_sha1[20];
unsigned char new_rev_sha1[20];

static int files, slots;
static int total_adds, total_rems, max_changes;
static int lines_added, lines_removed;

static struct fileinfo {
	char status;
	unsigned char old_sha1[20];
	unsigned char new_sha1[20];
	unsigned short old_mode;
	unsigned short new_mode;
	char *old_path;
	char *new_path;
	unsigned int added;
	unsigned int removed;
	unsigned long old_size;
	unsigned long new_size;
	int binary:1;
} *items;

static int use_ssdiff = 0;
static struct diff_filepair *current_filepair;

struct diff_filespec *cgit_get_current_old_file(void)
{
	return current_filepair->one;
}

struct diff_filespec *cgit_get_current_new_file(void)
{
	return current_filepair->two;
}

static void print_fileinfo(struct fileinfo *info)
{
	char *class;

	switch (info->status) {
	case DIFF_STATUS_ADDED:
		class = "add";
		break;
	case DIFF_STATUS_COPIED:
		class = "cpy";
		break;
	case DIFF_STATUS_DELETED:
		class = "del";
		break;
	case DIFF_STATUS_MODIFIED:
		class = "upd";
		break;
	case DIFF_STATUS_RENAMED:
		class = "mov";
		break;
	case DIFF_STATUS_TYPE_CHANGED:
		class = "typ";
		break;
	case DIFF_STATUS_UNKNOWN:
		class = "unk";
		break;
	case DIFF_STATUS_UNMERGED:
		class = "stg";
		break;
	default:
		die("bug: unhandled diff status %c", info->status);
	}

	html("<tr>");
	htmlf("<td class='mode'>");
	if (is_null_sha1(info->new_sha1)) {
		cgit_print_filemode(info->old_mode);
	} else {
		cgit_print_filemode(info->new_mode);
	}

	if (info->old_mode != info->new_mode &&
	    !is_null_sha1(info->old_sha1) &&
	    !is_null_sha1(info->new_sha1)) {
		html("<span class='modechange'>[");
		cgit_print_filemode(info->old_mode);
		html("]</span>");
	}
	htmlf("</td><td class='%s'>", class);
	cgit_diff_link(info->new_path, NULL, NULL, ctx.qry.head, ctx.qry.sha1,
		       ctx.qry.sha2, info->new_path, 0);
	if (info->status == DIFF_STATUS_COPIED || info->status == DIFF_STATUS_RENAMED) {
		htmlf(" (%s from ",
		      info->status == DIFF_STATUS_COPIED ? "copied" : "renamed");
		html_txt(info->old_path);
		html(")");
	}
	html("</td><td class='right'>");
	if (info->binary) {
		htmlf("bin</td><td class='graph'>%ld -> %ld bytes",
		      info->old_size, info->new_size);
		return;
	}
	htmlf("%d", info->added + info->removed);
	html("</td><td class='graph'>");
	htmlf("<table summary='file diffstat' width='%d%%'><tr>", (max_changes > 100 ? 100 : max_changes));
	htmlf("<td class='add' style='width: %.1f%%;'/>",
	      info->added * 100.0 / max_changes);
	htmlf("<td class='rem' style='width: %.1f%%;'/>",
	      info->removed * 100.0 / max_changes);
	htmlf("<td class='none' style='width: %.1f%%;'/>",
	      (max_changes - info->removed - info->added) * 100.0 / max_changes);
	html("</tr></tabl<style>pre { line-height: 125%; }
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.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span><span class="cp">#ifndef UI_REPOLIST_H</span>
<span class="cp">#define UI_REPOLIST_H</span>

<span class="k">extern</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">cgit_print_repolist</span><span class="p">();</span>
<span class="k">extern</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">cgit_print_site_readme</span><span class="p">();</span>

<span class="cp">#endif </span><span class="cm">/* UI_REPOLIST_H */</span>
</pre></div>
</code></pre></td></tr></table>
</div> <!-- class=content -->
<div class='footer'>generated by <a href='https://git.zx2c4.com/cgit/about/'>cgit v1.2.3-54-g00ecf</a> (<a href='https://git-scm.com/'>git 2.39.0</a>) at 2025-01-18 04:54:33 +0000</div>
</div> <!-- id=cgit -->
</body>
</html>
ml_intoption(1, "ssdiff", curr);
	html("</select></td></tr>");
	html("<tr><td/><td class='ctrl'>");
	html("<noscript><input type='submit' value='reload'/></noscript>");
	html("</td></tr></table>");
	html("</form>");
	html("</div>");
}

void cgit_print_diff(const char *new_rev, const char *old_rev,
		     const char *prefix, int show_ctrls)
{
	enum object_type type;
	unsigned long size;
	struct commit *commit, *commit2;

	if (!new_rev)
		new_rev = ctx.qry.head;
	get_sha1(new_rev, new_rev_sha1);
	type = sha1_object_info(new_rev_sha1, &size);
	if (type == OBJ_BAD) {
		cgit_print_error(fmt("Bad object name: %s", new_rev));
		return;
	}
	commit = lookup_commit_reference(new_rev_sha1);
	if (!commit || parse_commit(commit)) {
		cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(new_rev_sha1)));
		return;
	}

	if (old_rev)
		get_sha1(old_rev, old_rev_sha1);
	else if (commit->parents && commit->parents->item)
		hashcpy(old_rev_sha1, commit->parents->item->object.sha1);
	else
		hashclr(old_rev_sha1);

	if (!is_null_sha1(old_rev_sha1)) {
		type = sha1_object_info(old_rev_sha1, &size);
		if (type == OBJ_BAD) {
			cgit_print_error(fmt("Bad object name: %s", sha1_to_hex(old_rev_sha1)));
			return;
		}
		commit2 = lookup_commit_reference(old_rev_sha1);
		if (!commit2 || parse_commit(commit2)) {
			cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(old_rev_sha1)));
			return;
		}
	}

	use_ssdiff = ctx.qry.has_ssdiff ? ctx.qry.ssdiff : ctx.cfg.ssdiff;

	if (show_ctrls)
		cgit_print_diff_ctrls();

	cgit_print_diffstat(old_rev_sha1, new_rev_sha1, prefix);

	if (use_ssdiff) {
		html("<table summary='ssdiff' class='ssdiff'>");
	} else {
		html("<table summary='diff' class='diff'>");
		html("<tr><td>");
	}
	cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb, prefix,
		       ctx.qry.ignorews);
	if (!use_ssdiff)
		html("</td></tr>");
	html("</table>");
}