3aa4d81f88
Add best-effort support for patches sent using format=flowed (RFC 3676).
Remove leading spaces ("unstuff"), remove soft line breaks (indicated
by space + newline), but leave the signature separator (dash dash space
newline) alone.
Warn in git am when encountering a format=flowed patch, because any
trailing spaces would most probably be lost, as the sending MUA is
encouraged to remove them when preparing the email.
Provide a test patch formatted by Mozilla Thunderbird 60 using its
default configuration. It reuses the contents of the file mailinfo.c
before and after this patch.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
130 lines
3.3 KiB
Plaintext
130 lines
3.3 KiB
Plaintext
From: A <author@example.com>
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Subject: [PATCH] mailinfo: support format=flowed
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Message-ID: <aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa@example.com>
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Date: Sat, 25 Aug 2018 22:04:50 +0200
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User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
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Thunderbird/60.0
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MIME-Version: 1.0
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Content-Type: text/plain; charset=utf-8; format=flowed
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Content-Language: en-US
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Content-Transfer-Encoding: 7bit
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---
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mailinfo.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
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1 file changed, 62 insertions(+), 2 deletions(-)
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diff --git a/mailinfo.c b/mailinfo.c
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index 3281a37d51..b395adbdf2 100644
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--- a/mailinfo.c
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+++ b/mailinfo.c
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@@ -237,11 +237,22 @@ static int slurp_attr(const char *line, const char
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*name, struct strbuf *attr)
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return 1;
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}
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+static int has_attr_value(const char *line, const char *name, const
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char *value)
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+{
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+ struct strbuf sb = STRBUF_INIT;
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+ int rc = slurp_attr(line, name, &sb) && !strcasecmp(sb.buf, value);
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+ strbuf_release(&sb);
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+ return rc;
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+}
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+
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static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
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{
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struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
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strbuf_init(boundary, line->len);
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+ mi->format_flowed = has_attr_value(line->buf, "format=", "flowed");
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+ mi->delsp = has_attr_value(line->buf, "delsp=", "yes");
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+
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if (slurp_attr(line->buf, "boundary=", boundary)) {
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strbuf_insert(boundary, 0, "--", 2);
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if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
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@@ -964,6 +975,52 @@ static int handle_boundary(struct mailinfo *mi,
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struct strbuf *line)
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return 1;
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}
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+static void handle_filter_flowed(struct mailinfo *mi, struct strbuf *line,
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+ struct strbuf *prev)
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+{
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+ size_t len = line->len;
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+ const char *rest;
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+
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+ if (!mi->format_flowed) {
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+ handle_filter(mi, line);
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+ return;
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+ }
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+
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+ if (line->buf[len - 1] == '\n') {
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+ len--;
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+ if (len && line->buf[len - 1] == '\r')
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+ len--;
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+ }
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+
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+ /* Keep signature separator as-is. */
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+ if (skip_prefix(line->buf, "-- ", &rest) && rest - line->buf == len) {
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+ if (prev->len) {
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+ handle_filter(mi, prev);
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+ strbuf_reset(prev);
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+ }
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+ handle_filter(mi, line);
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+ return;
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+ }
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+
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+ /* Unstuff space-stuffed line. */
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+ if (len && line->buf[0] == ' ') {
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+ strbuf_remove(line, 0, 1);
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+ len--;
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+ }
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+
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+ /* Save flowed line for later, but without the soft line break. */
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+ if (len && line->buf[len - 1] == ' ') {
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+ strbuf_add(prev, line->buf, len - !!mi->delsp);
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+ return;
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+ }
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+
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+ /* Prepend any previous partial lines */
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+ strbuf_insert(line, 0, prev->buf, prev->len);
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+ strbuf_reset(prev);
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+
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+ handle_filter(mi, line);
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+}
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+
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static void handle_body(struct mailinfo *mi, struct strbuf *line)
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{
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struct strbuf prev = STRBUF_INIT;
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@@ -1012,7 +1069,7 @@ static void handle_body(struct mailinfo *mi,
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struct strbuf *line)
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strbuf_addbuf(&prev, sb);
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break;
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}
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- handle_filter(mi, sb);
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+ handle_filter_flowed(mi, sb, &prev);
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}
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/*
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* The partial chunk is saved in "prev" and will be
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@@ -1022,13 +1079,16 @@ static void handle_body(struct mailinfo *mi,
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struct strbuf *line)
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break;
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}
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default:
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- handle_filter(mi, line);
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+ handle_filter_flowed(mi, line, &prev);
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}
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if (mi->input_error)
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break;
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} while (!strbuf_getwholeline(line, mi->input, '\n'));
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+ if (prev.len)
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+ handle_filter(mi, &prev);
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+
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flush_inbody_header_accum(mi);
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handle_body_out:
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--
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2.18.0
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