<
/* 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"

char *diff_buffer;
int diff_buffer_size;


/*
 * print a single line returned from xdiff
 */
static void print_line(char *line, int len)
{
	char *class = "ctx";
	char c = line[len-1];

	if (line[0] == '+')
		class = "add";
	else if (line[0] == '-')
		class = "del";
	else if (line[0] == '@')
		class = "hunk";

	htmlf("<div class='%s'>", class);
	line[len-1] = '\0';
	html_txt(line);
	html("</div>");
	line[len-1]pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
/* shared.c: global vars + some callback functions
 *
 * Copyright (C) 2006 Lars Hjemli
 *
 * Licensed under GNU General Public License v2
 *   (see COPYING for full license text)
 */

#include "cgit.h"

struct repolist cgit_repolist;
struct repoinfo *cgit_repo;
int cgit_cmd;

const char *cgit_version = CGIT_VERSION;

char *cgit_root_title   = "Git repository browser";
char *cgit_css          = "/cgit.css";
char *cgit_logo         = "/git-logo.png";
char *cgit_index_header = NULL;
char *cgit_logo_link    = "http://www.kernel.org/pub/software/scm/git/docs/";
char *cgit_module_link  = "./?repo=%s&page=commit&id=%s";
char *cgit_agefile      = "info/web/last-modified";
char *cgit_virtual_root = NULL;
char *cgit_script_name  = CGIT_SCRIPT_NAME;
char *cgit_cache_root   = CGIT_CACHE_ROOT;
char *cgit_repo_group   = NULL;

int cgit_nocache               =  0;
int cgit_snapshots             =  0;
int cgit_enable_index_links    =  0;
int cgit_enable_log_filecount  =  0;
int cgit_enable_log_linecount  =  0;
int cgit_max_lock_attempts     =  5;
int cgit_cache_root_ttl        =  5;
int cgit_cache_repo_ttl        =  5;
int cgit_cache_dynamic_ttl     =  5;
int cgit_cache_static_ttl      = -1;
int cgit_cache_max_create_time =  5;
int cgit_summary_log           =  0;

int cgit_max_msg_len = 60;
int cgit_max_repodesc_len = 60;
int cgit_max_commit_count = 50;

int cgit_query_has_symref = 0;
int cgit_query_has_sha1   = 0;

char *cgit_querystring  = NULL;
char *cgit_query_repo   = NULL;
char *cgit_query_page   = NULL;
char *cgit_query_head   = NULL;
char *cgit_query_search = NULL;
char *cgit_query_sha1   = NULL;
char *cgit_query_sha2   = NULL;
char *cgit_query_path   = NULL;
char *cgit_query_name   = NULL;
int   cgit_query_ofs    = 0;

int htmlfd = 0;


int cgit_get_cmd_index(const char *cmd)
{
	static char *cmds[] = {"log", "commit", "diff", "tree", "blob",
			       "snapshot", "tag", NULL};
	int i;

	for(i = 0; cmds[i]; i++)
		if (!strcmp(cmd, cmds[i]))
			return i + 1;
	return 0;
}

int chk_zero(int result, char *msg)
{
	if (result != 0)
		die("%s: %s", msg, strerror(errno));
	return result;
}

int chk_positive(int result, char *msg)
{
	if (result <= 0)
		die("%s: %s", msg, strerror(errno));
	return result;
}

int chk_non_negative(int result, char *msg)
{
    	if (result < 0)
	    	die("%s: %s",msg, strerror(errno));
	return result;
}

struct repoinfo *add_repo(const char *url)
{
	struct repoinfo *ret;

	if (++cgit_repolist.count > cgit_repolist.length) {
		if (cgit_repolist.length == 0)
			cgit_repolist.length = 8;
		else
			cgit_repolist.length *= 2;
		cgit_repolist.repos = xrealloc(cgit_repolist.repos,
					       cgit_repolist.length *
					       sizeof(struct repoinfo));
	}

	ret = &cgit_repolist.repos[cgit_repolist.count-1];
	ret->url = trim_end(url, '/');
	ret->name = ret->url;
	ret->path = NULL;
	ret->desc = NULL;
	ret->owner = NULL;
	ret->group = cgit_repo_group;
	ret->defbranch = "master";
	ret->snapshots = cgit_snapshots;
	ret->enable_log_filecount = cgit_enable_log_filecount;
	ret->enable_log_linecount = cgit_enable_log_linecount;
	ret->module_link = cgit_module_link;
	ret->readme = NULL;
	return ret;
}

struct repoinfo *cgit_get_repoinfo(const char *url)
{
	int i;
	struct repoinfo *repo;

	for (i=0; i<cgit_repolist.count; i++) {
		repo = &cgit_repolist.repos[i];
		if (!strcmp(repo->url, url))
			return repo;
	}
	return NULL;
}

void cgit_global_config_cb(const char *name, const char *value)
{
	if (!strcmp(name, "root-title"))
		cgit_root_title = xstrdup(value);
	else if (!strcmp(name, "css"))
		cgit_css = xstrdup(value);
	else if (!strcmp(name, "logo"))
		cgit_logo = xstrdup(value);
	else if (!strcmp(name, "index-header"))
		cgit_index_header = xstrdup(value);
	else if (!strcmp(name, "logo-link"))
		cgit_logo_link = xstrdup(value);
	else if (!strcmp(name, "module-link"))
		cgit_module_link = xstrdup(value);
	else if (!strcmp(name, "virtual-root"))
		cgit_virtual_root = trim_end(value, '/');
	else if (!strcmp(name, "nocache"))
		cgit_nocache = atoi(value);
	else if (!strcmp(name, "snapshots"))
		cgit_snapshots = cgit_parse_snapshots_mask(value);
	else if (!strcmp(name, "enable-index-links"))
		cgit_enable_index_links = atoi(value);
	else if (!strcmp(name, "enable-log-filecount"))
		cgit_enable_log_filecount = atoi(value);
	else if (!strcmp(name, "enable-log-linecount"))
		cgit_enable_log_linecount = atoi(value);
	else if (!strcmp(name, "cache-root"))
		cgit_cache_root = xstrdup(value);
	else if (!strcmp(name, "cache-root-ttl"))
		cgit_cache_root_ttl = atoi(value);
	else if (!strcmp(name, "cache-repo-ttl"))
		cgit_cache_repo_ttl = atoi(value);
	else if (!strcmp(name, "cache-static-ttl"))
		cgit_cache_static_ttl = atoi(value);
	else if (!strcmp(name, "cache-dynamic-ttl"))
		cgit_cache_dynamic_ttl = atoi(value);
	else if (!strcmp(name, "max-message-length"))
		cgit_max_msg_len = atoi(value);
	else if (!strcmp(name, "max-repodesc-length"))
		cgit_max_repodesc_len = atoi(value);
	else if (!strcmp(name, "max-commit-count"))
		cgit_max_commit_count = atoi(value);
	else if (!strcmp(name, "summary-log"))
		cgit_summary_log = atoi(value);
	else if (!strcmp(name, "agefile"))
		cgit_agefile = xstrdup(value);
	else if (!strcmp(name, "repo.group"))
		cgit_repo_group = xstrdup(value);
	else if (!strcmp(name, "repo.url"))
		cgit_repo = add_repo(value);
	else if (!strcmp(name, "repo.name"))
		cgit_repo->name = xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.path"))
		cgit_repo->path = trim_end(value, '/');
	else if (cgit_repo && !strcmp(name, "repo.desc"))
		cgit_repo->desc = xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.owner"))
		cgit_repo->owner = xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.defbranch"))
		cgit_repo->defbranch = xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.snapshots"))
		cgit_repo->snapshots = cgit_snapshots & cgit_parse_snapshots_mask(value); /* XXX: &? */
	else if (cgit_repo && !strcmp(name, "repo.enable-log-filecount"))
		cgit_repo->enable_log_filecount = cgit_enable_log_filecount * atoi(value);
	else if (cgit_repo && !strcmp(name, "repo.enable-log-linecount"))
		cgit_repo->enable_log_linecount = cgit_enable_log_linecount * atoi(value);
	else if (cgit_repo && !strcmp(name, "repo.module-link"))
		cgit_repo->module_link= xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.readme") && value != NULL) {
		if (*value == '/')
			cgit_repo->readme = xstrdup(value);
		else
			cgit_repo->readme = xstrdup(fmt("%s/%s", cgit_repo->path, value));
	} else if (!strcmp(name, "include"))
		cgit_read_config(value, cgit_global_config_cb);
}

void cgit_querystring_cb(const char *name, const char *value)
{
	if (!strcmp(name,"r")) {
		cgit_query_repo = xstrdup(value);
		cgit_repo = cgit_get_repoinfo(value);
	} else if (!strcmp(name, "p")) {
		cgit_query_page = xstrdup(value);
		cgit_cmd = cgit_get_cmd_index(value);
	} else if (!strcmp(name, "url")) {
		cgit_parse_url(value);
	} else if (!strcmp(name, "q")) {
		cgit_query_search = xstrdup(value);
	} else if (!strcmp(name, "h")) {
		cgit_query_head = xstrdup(value);
		cgit_query_has_symref = 1;
	} else if (!strcmp(name, "id")) {
		cgit_query_sha1 = xstrdup(value);
		cgit_query_has_sha1 = 1;
	} else if (!strcmp(name, "id2")) {
		cgit_query_sha2 = xstrdup(value);
		cgit_query_has_sha1 = 1;
	} else if (!strcmp(name, "ofs")) {
		cgit_query_ofs = atoi(value);
	} else if (!strcmp(name, "path")) {
		cgit_query_path = trim_end(value, '/');
	} else if (!strcmp(name, "name")) {
		cgit_query_name = xstrdup(value);
	}
}

void *cgit_free_commitinfo(struct commitinfo *info)
{
	free(info->author);
	free(info->author_email);
	free(info->committer);
	free(info->committer_email);
	free(info->subject);
	free(info);
	return NULL;
}

int hextoint(char c)
{
	if (c >= 'a' && c <= 'f')
		return 10 + c - 'a';
	else if (c >= 'A' && c <= 'F')
		return 10 + c - 'A';
	else if (c >= '0' && c <= '9')
		return c - '0';
	else
		return -1;
}

char *trim_end(const char *str, char c)
{
	int len;
	char *s, *t;

	if (str == NULL)
		return NULL;
	t = (char *)str;
	len = strlen(t);
	while(len > 0 && t[len - 1] == c)
		len--;

	if (len == 0)
		return NULL;

	c = t[len];
	t[len] = '\0';
	s = xstrdup(t);
	t[len] = c;
	return s;
}

void cgit_diff_tree_cb(struct diff_queue_struct *q,
		       struct diff_options *options, void *data)
{
	int i;

	for (i = 0; i < q->nr; i++) {
		if (q->queue[i]->status == 'U')
			continue;
		((filepair_fn)data)(q->queue[i]);
	}
}

static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
{
	enum object_type type;

	if (is_null_sha1(sha1)) {
		file->ptr = (char *)"";
		file->size = 0;
	} else {
		file->ptr = read_sha1_file(sha1, &type, 
		                           (unsigned long *)&file->size);
	}
	return 1;
}

/*
 * Receive diff-buffers from xdiff and concatenate them as
 * needed across multiple callbacks.
 *
 * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 * ripped from git and modified to use globals instead of
 * a special callback-struct.
 */
char *diffbuf = NULL;
int buflen = 0;

int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
{
	int i;

	for (i = 0; i < nbuf; i++) {
		if (mb[i].ptr[mb[i].size-1] != '\n') {
			/* Incomplete line */
			diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
			memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
			buflen += mb[i].size;
			continue;
		}

		/* we have a complete line */
		if (!diffbuf) {
			((linediff_fn)priv)(mb[i].ptr, mb[i].size);
			continue;
		}
		diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
		memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
		((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
		free(diffbuf);
		diffbuf = NULL;
		buflen = 0;
	}
	if (diffbuf) {
		((linediff_fn)priv)(diffbuf, buflen);
		free(diffbuf);
		diffbuf = NULL;
		buflen = 0;
	}
	return 0;
}

int cgit_diff_files(const unsigned char *old_sha1,
		     const unsigned char *new_sha1,
		     linediff_fn fn)
{
	mmfile_t file1, file2;
	xpparam_t diff_params;
	xdemitconf_t emit_params;
	xdemitcb_t emit_cb;

	if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
		return 1;

	diff_params.flags = XDF_NEED_MINIMAL;
	emit_params.ctxlen = 3;
	emit_params.flags = XDL_EMIT_FUNCNAMES;
	emit_params.find_func = NULL;
	emit_cb.outf = filediff_cb;
	emit_cb.priv = fn;
	xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
	return 0;
}

void cgit_diff_tree(const unsigned char *old_sha1,
		    const unsigned char *new_sha1,
		    filepair_fn fn)
{
	struct diff_options opt;
	int ret;

	diff_setup(&opt);
	opt.output_format = DIFF_FORMAT_CALLBACK;
	opt.detect_rename = 1;
	opt.recursive = 1;
	opt.format_callback = cgit_diff_tree_cb;
	opt.format_callback_data = fn;
	diff_setup_done(&opt);

	if (old_sha1 && !is_null_sha1(old_sha1))
		ret = diff_tree_sha1(old_sha1, new_sha1, "", &opt);
	else
		ret = diff_root_tree_sha1(new_sha1, "", &opt);
	diffcore_std(&opt);
	diff_flush(&opt);
}

void cgit_diff_commit(struct commit *commit, filepair_fn fn)
{
	unsigned char *old_sha1 = NULL;

	if (commit->parents)
		old_sha1 = commit->parents->item->object.sha1;
	cgit_diff_tree(old_sha1, commit->object.sha1, fn);
}