[PATCH v8 00/10] grep: simplify & delete "init" & "config" code

A v8 re-roll of this series. For context and v7 see: https://lore.kernel.org/git/cover-v7-00.10-00000000000-20211228T004707Z-avarab@gmail.com

The v7 has not been picked up yet. The ab/grep-patterntype in Junio's tree is the v6. This v8 is rebased on "master" for a merge conflict with the now-merged lh/use-gnu-color-in-grep.

Ævar Arnfjörð Bjarmason (10):
  grep.h: remove unused "regex_t regexp" from grep_opt
  log tests: check if grep_config() is called by "log"-like cmds
  grep tests: add missing "grep.patternType" config tests
  built-ins: trust the "prefix" from run_builtin()
  grep.c: don't pass along NULL callback value
  grep API: call grep_config() after grep_init()
  grep.h: make "grep_opt.pattern_type_option" use its enum
  grep.c: do "if (bool && memchr())" not "if (memchr() && bool)"
  grep: simplify config parsing and option parsing
  grep.[ch]: remove GREP_PATTERN_TYPE_UNSPECIFIED

 builtin/grep.c    |  27 +++++-----
 builtin/log.c     |  13 ++++-
 builtin/ls-tree.c |   2 +-
 git.c             |   1 +
 grep.c            | 126 +++++++++-------------------------------------
 grep.h            |  34 +++++++++----
 revision.c        |   4 +-
 t/t4202-log.sh    |  24 +++++++++
 t/t7810-grep.sh   |  68 +++++++++++++++++++++++++
 9 files changed, 168 insertions(+), 131 deletions(-)

Range-diff against v7:
 1:  b62e6b6162a =  1:  010a2066656 grep.h: remove unused "regex_t regexp" from grep_opt
 2:  0edcdb50afd =  2:  e4981fa3417 log tests: check if grep_config() is called by "log"-like cmds
 3:  e1b4b5b77e0 =  3:  59092169e55 grep tests: add missing "grep.patternType" config tests
 4:  6d91a765fd7 =  4:  331c9019a0e built-ins: trust the "prefix" from run_builtin()
 5:  844b4727ca3 =  5:  25dd327b653 grep.c: don't pass along NULL callback value
 6:  d9cf9bf5e37 !  6:  3c559ad006a grep API: call grep_config() after grep_init()
    @@ grep.c: static void std_output(struct grep_opt *opt, const void *buf, size_t siz
     -	.pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED,
     -	.colors = {
     -		[GREP_COLOR_CONTEXT] = "",
    --		[GREP_COLOR_FILENAME] = "",
    +-		[GREP_COLOR_FILENAME] = GIT_COLOR_MAGENTA,
     -		[GREP_COLOR_FUNCTION] = "",
    --		[GREP_COLOR_LINENO] = "",
    --		[GREP_COLOR_COLUMNNO] = "",
    +-		[GREP_COLOR_LINENO] = GIT_COLOR_GREEN,
    +-		[GREP_COLOR_COLUMNNO] = GIT_COLOR_GREEN,
     -		[GREP_COLOR_MATCH_CONTEXT] = GIT_COLOR_BOLD_RED,
     -		[GREP_COLOR_MATCH_SELECTED] = GIT_COLOR_BOLD_RED,
     -		[GREP_COLOR_SELECTED] = "",
    @@ grep.h: struct grep_opt {
     +	.pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED, \
     +	.colors = { \
     +		[GREP_COLOR_CONTEXT] = "", \
    -+		[GREP_COLOR_FILENAME] = "", \
    ++		[GREP_COLOR_FILENAME] = GIT_COLOR_MAGENTA, \
     +		[GREP_COLOR_FUNCTION] = "", \
    -+		[GREP_COLOR_LINENO] = "", \
    -+		[GREP_COLOR_COLUMNNO] = "", \
    ++		[GREP_COLOR_LINENO] = GIT_COLOR_GREEN, \
    ++		[GREP_COLOR_COLUMNNO] = GIT_COLOR_GREEN, \
     +		[GREP_COLOR_MATCH_CONTEXT] = GIT_COLOR_BOLD_RED, \
     +		[GREP_COLOR_MATCH_SELECTED] = GIT_COLOR_BOLD_RED, \
     +		[GREP_COLOR_SELECTED] = "", \
 7:  57ecc5c0d65 =  7:  daf873899c1 grep.h: make "grep_opt.pattern_type_option" use its enum
 8:  7dbeafde26b =  8:  62650a78ea9 grep.c: do "if (bool && memchr())" not "if (memchr() && bool)"
 9:  c6ca39b4554 !  9:  c211bb0c69d grep: simplify config parsing and option parsing
    @@ grep.h: struct grep_opt {
      	int word_regexp;
     -	int fixed;
      	int all_match;
    - #define GREP_BINARY_DEFAULT	0
    - #define GREP_BINARY_NOMATCH	1
    + 	int no_body_match;
    + 	int body_hit;
     @@ grep.h: struct grep_opt {
      	int allow_textconv;
      	int extended;
10:  b764c09d2b7 ! 10:  b52a0c11fa9 grep.[ch]: remove GREP_PATTERN_TYPE_UNSPECIFIED
    @@ grep.h: struct grep_opt {
     -	.pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED, \
      	.colors = { \
      		[GREP_COLOR_CONTEXT] = "", \
    - 		[GREP_COLOR_FILENAME] = "", \
    + 		[GREP_COLOR_FILENAME] = GIT_COLOR_MAGENTA, \