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builtin-am: auto-detect mbox patches

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Since 15ced75 (git-am foreign patch support: autodetect some patch
formats, 2009-05-27), git-am.sh is able to autodetect mbox, stgit and
mercurial patches through heuristics.

Re-implement support for autodetecting mbox/maildir files in
builtin/am.c.

RFC 2822 requires that lines are terminated by "\r\n". To support this,
implement strbuf_getline_crlf(), which will remove both '\n' and "\r\n"
from the end of the line.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Paul Tan 2015-08-04 21:51:27 +08:00 committed by Junio C Hamano
parent 11c2177f2c
commit c29807b27d
1 changed files with 109 additions and 0 deletions
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109
builtin/am.c
View File

@ -10,6 +10,21 @@
#include "dir.h"
#include "run-command.h"
/**
* Like strbuf_getline(), but treats both '\n' and "\r\n" as line terminators.
*/
static int strbuf_getline_crlf(struct strbuf *sb, FILE *fp)
{
if (strbuf_getwholeline(sb, fp, '\n'))
return EOF;
if (sb->buf[sb->len - 1] == '\n') {
strbuf_setlen(sb, sb->len - 1);
if (sb->len > 0 && sb->buf[sb->len - 1] == '\r')
strbuf_setlen(sb, sb->len - 1);
}
return 0;
}
enum patch_format {
PATCH_FORMAT_UNKNOWN = 0,
PATCH_FORMAT_MBOX
@ -127,6 +142,92 @@ static void am_destroy(const struct am_state *state)
strbuf_release(&sb);
}
/**
* Determines if the file looks like a piece of RFC2822 mail by grabbing all
* non-indented lines and checking if they look like they begin with valid
* header field names.
*
* Returns 1 if the file looks like a piece of mail, 0 otherwise.
*/
static int is_mail(FILE *fp)
{
const char *header_regex = "^[!-9;-~]+:";
struct strbuf sb = STRBUF_INIT;
regex_t regex;
int ret = 1;
if (fseek(fp, 0L, SEEK_SET))
die_errno(_("fseek failed"));
if (regcomp(&regex, header_regex, REG_NOSUB | REG_EXTENDED))
die("invalid pattern: %s", header_regex);
while (!strbuf_getline_crlf(&sb, fp)) {
if (!sb.len)
break; /* End of header */
/* Ignore indented folded lines */
if (*sb.buf == '\t' || *sb.buf == ' ')
continue;
/* It's a header if it matches header_regex */
if (regexec(&regex, sb.buf, 0, NULL, 0)) {
ret = 0;
goto done;
}
}
done:
regfree(&regex);
strbuf_release(&sb);
return ret;
}
/**
* Attempts to detect the patch_format of the patches contained in `paths`,
* returning the PATCH_FORMAT_* enum value. Returns PATCH_FORMAT_UNKNOWN if
* detection fails.
*/
static int detect_patch_format(const char **paths)
{
enum patch_format ret = PATCH_FORMAT_UNKNOWN;
struct strbuf l1 = STRBUF_INIT;
FILE *fp;
/*
* We default to mbox format if input is from stdin and for directories
*/
if (!*paths || !strcmp(*paths, "-") || is_directory(*paths))
return PATCH_FORMAT_MBOX;
/*
* Otherwise, check the first few lines of the first patch, starting
* from the first non-blank line, to try to detect its format.
*/
fp = xfopen(*paths, "r");
while (!strbuf_getline_crlf(&l1, fp)) {
if (l1.len)
break;
}
if (starts_with(l1.buf, "From ") || starts_with(l1.buf, "From: ")) {
ret = PATCH_FORMAT_MBOX;
goto done;
}
if (l1.len && is_mail(fp)) {
ret = PATCH_FORMAT_MBOX;
goto done;
}
done:
fclose(fp);
strbuf_release(&l1);
return ret;
}
/**
* Splits out individual email patches from `paths`, where each path is either
* a mbox file or a Maildir. Returns 0 on success, -1 on failure.
@ -185,6 +286,14 @@ static int split_mail(struct am_state *state, enum patch_format patch_format,
static void am_setup(struct am_state *state, enum patch_format patch_format,
const char **paths)
{
if (!patch_format)
patch_format = detect_patch_format(paths);
if (!patch_format) {
fprintf_ln(stderr, _("Patch format detection failed."));
exit(128);
}
if (mkdir(state->dir, 0777) < 0 && errno != EEXIST)
die_errno(_("failed to create directory '%s'"), state->dir);