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/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.h"
 
#include <pwd.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <curl/curl.h>
 
#define BLOCKING (1ul << 14)
 
/*
 * FIXME! Share the code with "write-tree.c"
 */
static void init_buffer(char **bufp, unsigned int *sizep)
{
	char *buf = xmalloc(BLOCKING);
	*sizep = 0;
	*bufp = buf;
}
 
static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
{
	char one_line[2048];
	va_list args;
	int len;
	unsigned long alloc, size, newsize;
	char *buf;
 
	va_start(args, fmt);
	len = vsnprintf(one_line, sizeof(one_line), fmt, args);
	va_end(args);
	size = *sizep;
	newsize = size + len;
	alloc = (size + 32767) & ~32767;
	buf = *bufp;
	if (newsize > alloc) {
		alloc = (newsize + 32767) & ~32767;
		buf = xrealloc(buf, alloc);
		*bufp = buf;
	}
	*sizep = newsize;
	memcpy(buf + size, one_line, len);
}
 
static void remove_special(char *p)
{
	char c;
	char *dst = p, *src = p;
 
	for (;;) {
		c = *src;
		src++;
		switch(c) {
		case '\n': case '<': case '>':
			continue;
		}
		*dst++ = c;
		if (!c)
			break;
	}
 
	/*
	 * Go back, and remove crud from the end: some people
	 * have commas etc in their gecos field
	 */
	dst--;
	while (--dst >= p) {
		unsigned char c = *dst;
		switch (c) {
		case ',': case ';': case '.':
			*dst = 0;
			continue;
		}
		break;
	}
}
 
/* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
   (i.e. English) day/month names, and it doesn't work correctly with %z. */
static void parse_date(char *date, time_t *now, char *result, int maxlen)
{
	char *p;
	time_t then;
 
	if ((then = curl_getdate(date, now)) == 0)
		return;
 
	/* find the timezone at the end */
	p = date + strlen(date);
	while (p > date && isdigit(*--p))
		;
	if ((*p == '+' || *p == '-') && strlen(p) == 5)
		snprintf(result, maxlen, "%lu %5.5s", then, p);
}
 
static void check_valid(unsigned char *sha1, const char *expect)
{
	void *buf;
	char type[20];
	unsigned long size;
 
	buf = read_sha1_file(sha1, type, &size);
	if (!buf || strcmp(type, expect))
		die("%s is not a valid '%s' object", sha1_to_hex(sha1), expect);
	free(buf);
}
 
/*
 * Having more than two parents is not strange at all, and this is
 * how multi-way merges are represented.
 */
#define MAXPARENT (16)
 
static char *commit_tree_usage = "commit-tree <sha1> [-p <sha1>]* < changelog";
 
int main(int argc, char **argv)
{
	int i, len;
	int parents = 0;
	unsigned char tree_sha1[20];
	unsigned char parent_sha1[MAXPARENT][20];
	unsigned char commit_sha1[20];
	char *gecos, *realgecos, *commitgecos;
	char *email, *commitemail, realemail[1000];
	char date[20], realdate[20];
	char *audate;
	char comment[1000];
	struct passwd *pw;
	time_t now;
	struct tm *tm;
	char *buffer;
	unsigned int size;
 
	if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
		usage(commit_tree_usage);
 
	check_valid(tree_sha1, "tree");
	for (i = 2; i < argc; i += 2) {
		char *a, *b;
		a = argv[i]; b = argv[i+1];
		if (!b || strcmp(a, "-p") || get_sha1_hex(b, parent_sha1[parents]))
			usage(commit_tree_usage);
		check_valid(parent_sha1[parents], "commit");
		parents++;
	}
	if (!parents)
		fprintf(stderr, "Committing initial tree %s\n", argv[1]);
	pw = getpwuid(getuid());
	if (!pw)
		die("You don't exist. Go away!");
	realgecos = pw->pw_gecos;
	len = strlen(pw->pw_name);
	memcpy(realemail, pw->pw_name, len);
	realemail[len] = '@';
	gethostname(realemail+len+1, sizeof(realemail)-len-1);
	if (!strchr(realemail+len+1, '.')) {
		strcat(realemail, ".");
		getdomainname(realemail+strlen(realemail), sizeof(realemail)-strlen(realemail)-1);
	}
	time(&now);
	tm = localtime(&now);
 
	strftime(realdate, sizeof(realdate), "%s %z", tm);
	strcpy(date, realdate);
 
	commitgecos = getenv("COMMIT_AUTHOR_NAME") ? : realgecos;
	commitemail = getenv("COMMIT_AUTHOR_EMAIL") ? : realemail;
	gecos = getenv("AUTHOR_NAME") ? : realgecos;
	email = getenv("AUTHOR_EMAIL") ? : realemail;
	audate = getenv("AUTHOR_DATE");
	if (audate)
		parse_date(audate, &now, date, sizeof(date));
 
	remove_special(gecos); remove_special(realgecos); remove_special(commitgecos);
	remove_special(email); remove_special(realemail); remove_special(commitemail);
 
	init_buffer(&buffer, &size);
	add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
 
	/*
	 * NOTE! This ordering means that the same exact tree merged with a
	 * different order of parents will be a _different_ changeset even
	 * if everything else stays the same.
	 */
	for (i = 0; i < parents; i++)
		add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
 
	/* Person/date information */
	add_buffer(&buffer, &size, "author %s <%s> %s\n", gecos, email, date);
	add_buffer(&buffer, &size, "committer %s <%s> %s\n\n", commitgecos, commitemail, realdate);
 
	/* And add the comment */
	while (fgets(comment, sizeof(comment), stdin) != NULL)
		add_buffer(&buffer, &size, "%s", comment);
 
	write_sha1_file(buffer, size, "commit", commit_sha1);
	printf("%s\n", sha1_to_hex(commit_sha1));
	return 0;
}