So here is an attempt to libify "git mailinfo" so that the built-in
version of "git am" does not have to run it via run_command()
interface.  "git am", when fed an N-patch series, runs one
"mailsplit", N "mailinfo" and N "apply" all via run_command()
interface (plus 2 more "apply" and 1 "merge-recursive" per a patch
that does not apply cleanly, when run with the "-3" option), and
among the various programs spawned from "git am", "mailinfo" is the
most straight-forward, stupid and light-weight program, so it is a
no-brainer to pick it as the candidate for libification.

This goes on top of c5920b21 (mailinfo: ignore in-body header that
we do not care about, 2015-10-08) that was posted earlier as a
weatherbaloon patch.

Junio C Hamano (26):
  mailinfo: remove a no-op call convert_to_utf8(it, "")
  mailinfo: fix for off-by-one error in boundary stack
  mailinfo: fold decode_header_bq() into decode_header()
  mailinfo: move handle_boundary() lower
  mailinfo: get rid of function-local static states
  mailinfo: always pass "line" as an argument
  mailinfo: move global "line" into mailinfo() function
  mailinfo: introduce "struct mailinfo" to hold globals
  mailinfo: move keep_subject & keep_non_patch_bracket to struct mailinfo
  mailinfo: move global "FILE *fin, *fout" to struct mailinfo
  mailinfo: move filter/header stage to struct mailinfo
  mailinfo: move patch_lines to struct mailinfo
  mailinfo: move add_message_id and message_id to struct mailinfo
  mailinfo: move use_scissors and use_inbody_headers to struct mailinfo
  mailinfo: move metainfo_charset to struct mailinfo
  mailinfo: move transfer_encoding to struct mailinfo
  mailinfo: move charset to struct mailinfo
  mailinfo: handle_commit_msg() shouldn't be called after finding patchbreak
  mailinfo: move cmitmsg and patchfile to struct mailinfo
  mailinfo: move [ps]_hdr_data to struct mailinfo
  mailinfo: keep the parsed log message in a strbuf
  mailinfo: move content/content_top to struct mailinfo
  mailinfo: handle errors found in decode_header() better
  mailinfo: handle charset conversion errors in the caller
  mailinfo: remove calls to exit() and die() deep in the callchain
  mailinfo: libify the whole thing

 Makefile           |    1 +
 builtin/mailinfo.c | 1083 +---------------------------------------------------
 mailinfo.c         | 1058 ++++++++++++++++++++++++++++++++++++++++++++++++++
 mailinfo.h         |   41 ++
 4 files changed, 1120 insertions(+), 1063 deletions(-)
 create mode 100644 mailinfo.c
 create mode 100644 mailinfo.h

-- 
2.6.1-320-g86a1181