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path: root/filters/syntax-highlighting.sh
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#!/bin/sh
# This script can be used to implement syntax highlighting in the cgit
# tree-view by refering to this file with the source-filter or repo.source-
# filter options in cgitrc.
#
# This script requires a shell supporting the ${var##pattern} syntax.
# It is supported by at least dash and bash, however busybox environments
# might have to use an external call to sed instead.
#
# Note: the highlight command (http://www.andre-simon.de/) uses css for syntax
# highlighting, so you'll probably want something like the following included
# in your css file (generated by highlight 2.4.8 and adapted for cgit):
#
# table.blob .num  { color:#2928ff; }
# table.blob .esc  { color:#ff00ff; }
# table.blob .str  { color:#ff0000; }
# table.blob .dstr { color:#818100; }
# table.blob .slc  { color:#838183; font-style:italic; }
# table.blob .com  { color:#838183; font-style:italic; }
# table.blob .dir  { color:#008200; }
# table.blob .sym  { color:#000000; }
# table.blob .kwa  { color:#000000; font-weight:bold; }
# table.blob .kwb  { color:#830000; }
# table.blob .kwc  { color:#000000; font-weight:bold; }
# table.blob .kwd  { color:#010181; }
#
# The following environment variables can be used to retrieve the configuration
# of the repository for which this script is called:
# CGIT_REPO_URL        ( = repo.url       setting )
# CGIT_REPO_NAME       ( = repo.name      setting )
# CGIT_REPO_PATH       ( = repo.path      setting )
# CGIT_REPO_OWNER      ( = repo.owner     setting )
# CGIT_REPO_DEFBRANCH  ( = repo.defbranch setting )
# CGIT_REPO_SECTION    ( = section        setting )
# CGIT_REPO_CLONE_URL  ( = repo.clone-url setting )
#

# store filename and extension in local vars
BASENAME="$1"
EXTENSION="${BASENAME##*.}"

# map Makefile and Makefile.* to .mk
[ "${BASENAME%%.*}" == "Makefile" ] && EXTENSION=mk

# highlight versions 2 and 3 have different commandline options. Specifically,
# the -X option that is used for version 2 is replaced by the -O xhtml option
# for version 3.
#
# Version 2 can be found (for example) on EPEL 5, while version 3 can be
# found (for example) on EPEL 6.
#
# This is for version 2
exec highlight --force -f -I -X -S $EXTENSION 2>/dev/null

# This is for version 3
#
# On CentOS 6.2 (using highlight from EPEL), when highlight doesn't know about
# an EXTENSION, it outputs a lua error and _no_ text, even when the --force
# option is used.
#
# Also see the bug reports at:
# http://sourceforge.net/tracker/?func=detail&aid=3490017&group_id=215618&atid=1034391
# https://bugzilla.redhat.com/show_bug.cgi?id=795567
#
# This workaround can be removed when the bug is fixed upstream and the new
# version is packaged in most distributions.
#
# The workaround is to set the extension to 'txt' (plain text) when highlight
# exits with an error (doesn't know the format).
#
#echo "test" | highlight -f -I -O xhtml -S $EXTENSION &>/dev/null
#[ ${?} -ne 0 ] && EXTENSION="txt"
#exec highlight --force -f -I -O xhtml -S $EXTENSION 2>/dev/null
'>418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521
/* 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_index_info   = 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;
char *cgit_robots       = "index, nofollow";
char *cgit_clone_prefix = 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_summary_tags          =  0;
int cgit_summary_branches      =  0;
int cgit_renamelimit           = -1;

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_grep   = 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", "refs", "patch", 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 = "[no description]";
	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, "index-info"))
		cgit_index_info = 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, '/');
		if (!cgit_virtual_root && (!strcmp(value, "/")))
			cgit_virtual_root = "";
	} 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, "summary-branches"))
		cgit_summary_branches = atoi(value);
	else if (!strcmp(name, "summary-tags"))
		cgit_summary_tags = atoi(value);
	else if (!strcmp(name, "agefile"))
		cgit_agefile = xstrdup(value);
	else if (!strcmp(name, "renamelimit"))
		cgit_renamelimit = atoi(value);
	else if (!strcmp(name, "robots"))
		cgit_robots = xstrdup(value);
	else if (!strcmp(name, "clone-prefix"))
		cgit_clone_prefix = 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.clone-url"))
		cgit_repo->clone_url = xstrdup(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, "qt")) {
		cgit_query_grep = xstrdup(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->msg);
	free(info->msg_encoding);
	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;
}

char *strlpart(char *txt, int maxlen)
{
	char *result;

	if (!txt)
		return txt;

	if (strlen(txt) <= maxlen)
		return txt;
	result = xmalloc(maxlen + 1);
	memcpy(result, txt, maxlen - 3);
	result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
	result[maxlen] = '\0';
	return result;
}

char *strrpart(char *txt, int maxlen)
{
	char *result;

	if (!txt)
		return txt;

	if (strlen(txt) <= maxlen)
		return txt;
	result = xmalloc(maxlen + 1);
	memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
	result[0] = result[1] = result[2] = '.';
	return result;
}

void cgit_add_ref(struct reflist *list, struct refinfo *ref)
{
	size_t size;

	if (list->count >= list->alloc) {
		list->alloc += (list->alloc ? list->alloc : 4);
		size = list->alloc * sizeof(struct refinfo *);
		list->refs = xrealloc(list->refs, size);
	}
	list->refs[list->count++] = ref;
}

struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
{
	struct refinfo *ref;

	ref = xmalloc(sizeof (struct refinfo));
	ref->refname = xstrdup(refname);
	ref->object = parse_object(sha1);
	switch (ref->object->type) {
	case OBJ_TAG:
		ref->tag = cgit_parse_tag((struct tag *)ref->object);
		break;
	case OBJ_COMMIT:
		ref->commit = cgit_parse_commit((struct commit *)ref->object);
		break;
	}
	return ref;
}

int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
		  void *cb_data)
{
	struct reflist *list = (struct reflist *)cb_data;
	struct refinfo *info = cgit_mk_refinfo(refname, sha1);

	if (info)
		cgit_add_ref(list, info);
	return 0;
}

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, const char *prefix)
{
	struct diff_options opt;
	int ret;
	int prefixlen;

	diff_setup(&opt);
	opt.output_format = DIFF_FORMAT_CALLBACK;
	opt.detect_rename = 1;
	opt.rename_limit = cgit_renamelimit;
	DIFF_OPT_SET(&opt, RECURSIVE);
	opt.format_callback = cgit_diff_tree_cb;
	opt.format_callback_data = fn;
	if (prefix) {
		opt.nr_paths = 1;
		opt.paths = &prefix;
		prefixlen = strlen(prefix);
		opt.pathlens = &prefixlen;
	}
	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, NULL);
}