[PATCH v7 00/10] docs: create & use "(user|developer) interfaces" categories

See the v5 for a general overview: https://lore.kernel.org/git/cover-v5-0.9-00000000000-20220721T160721Z-avarab@gmail.com/

This v7:

 * Gets rid of the BUG() addition in an earlier commit when handle the
   command-list.txt data.

 * We still need to change that drop_prefix() function to handle our
   new categories.

   That's now done in a couple of commits. One to
   change it to a "switch" statement without any functional changes,
   another to strip either "git" or "git-" prefixes, not both.

 * There was an indentation error in a command-list.txt addition, fix
   it.

Ævar Arnfjörð Bjarmason (10):
  help.c: refactor drop_prefix() to use a "switch" statement"
  help.c: remove common category behavior from drop_prefix() behavior
  git help doc: use "<doc>" instead of "<guide>"
  git docs: add a category for user-facing file, repo and command UX
  git docs: add a category for file formats, protocols and interfaces
  docs: move commit-graph format docs to man section 5
  docs: move protocol-related docs to man section 5
  docs: move pack format docs to man section 5
  docs: move http-protocol docs to man section 5
  docs: move multi-pack-index docs to man section 5

 Documentation/Makefile                        | 26 +++++-----
 Documentation/config/lsrefs.txt               |  2 +-
 Documentation/config/pack.txt                 |  2 +-
 Documentation/config/protocol.txt             |  2 +-
 Documentation/git-bundle.txt                  | 13 +++--
 Documentation/git-commit-graph.txt            |  5 ++
 Documentation/git-help.txt                    | 27 ++++++++--
 Documentation/git-multi-pack-index.txt        |  6 +--
 Documentation/git-upload-pack.txt             |  7 ++-
 Documentation/git.txt                         | 17 +++++++
 ...bundle-format.txt => gitformat-bundle.txt} | 44 ++++++++++++++---
 .../chunk-format.txt => gitformat-chunk.txt}  | 29 ++++++++---
 ...-format.txt => gitformat-commit-graph.txt} | 49 +++++++++++++------
 .../index-format.txt => gitformat-index.txt}  | 22 ++++++++-
 ...dex.txt => gitformat-multi-pack-index.txt} | 20 +++++++-
 ...uft-packs.txt => gitformat-pack-cruft.txt} | 22 ++++++++-
 .../pack-format.txt => gitformat-pack.txt}    | 39 +++++++++++++--
 ...ure-format.txt => gitformat-signature.txt} | 21 ++++++--
 ...ities.txt => gitprotocol-capabilities.txt} | 28 ++++++++---
 ...ocol-common.txt => gitprotocol-common.txt} | 23 ++++++++-
 ...http-protocol.txt => gitprotocol-http.txt} | 35 ++++++++++---
 ...pack-protocol.txt => gitprotocol-pack.txt} | 28 ++++++++---
 .../protocol-v2.txt => gitprotocol-v2.txt}    | 27 +++++++---
 .../howto/recover-corrupted-object-harder.txt |  2 +-
 Documentation/lint-man-section-order.perl     |  3 ++
 Documentation/technical/api-simple-ipc.txt    |  2 +-
 .../technical/hash-function-transition.txt    |  2 +-
 .../long-running-process-protocol.txt         |  2 +-
 Documentation/technical/packfile-uri.txt      |  2 +-
 Documentation/technical/partial-clone.txt     |  2 +-
 Documentation/user-manual.txt                 |  2 +-
 Makefile                                      |  1 +
 builtin/help.c                                | 20 +++++++-
 cache.h                                       |  3 +-
 command-list.txt                              | 38 +++++++++++---
 help.c                                        | 41 ++++++++++++++--
 help.h                                        |  2 +
 pack-revindex.h                               |  2 +-
 refspec.h                                     |  2 +-
 t/t0012-help.sh                               | 14 +++++-
 t/t5551-http-fetch-smart.sh                   |  4 +-
 41 files changed, 512 insertions(+), 126 deletions(-)
 rename Documentation/{technical/bundle-format.txt => gitformat-bundle.txt} (79%)
 rename Documentation/{technical/chunk-format.txt => gitformat-chunk.txt} (89%)
 rename Documentation/{technical/commit-graph-format.txt => gitformat-commit-graph.txt} (87%)
 rename Documentation/{technical/index-format.txt => gitformat-index.txt} (98%)
 rename Documentation/{technical/multi-pack-index.txt => gitformat-multi-pack-index.txt} (94%)
 rename Documentation/{technical/cruft-packs.txt => gitformat-pack-cruft.txt} (96%)
 rename Documentation/{technical/pack-format.txt => gitformat-pack.txt} (95%)
 rename Documentation/{technical/signature-format.txt => gitformat-signature.txt} (96%)
 rename Documentation/{technical/protocol-capabilities.txt => gitprotocol-capabilities.txt} (96%)
 rename Documentation/{technical/protocol-common.txt => gitprotocol-common.txt} (89%)
 rename Documentation/{technical/http-protocol.txt => gitprotocol-http.txt} (97%)
 rename Documentation/{technical/pack-protocol.txt => gitprotocol-pack.txt} (98%)
 rename Documentation/{technical/protocol-v2.txt => gitprotocol-v2.txt} (97%)

Range-diff against v6:
 1:  f3588319057 !  1:  2665148f45b help.c: BUG() out if "help --guides" can't remove "git" prefixes
    @@ Metadata
     Author: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
     
      ## Commit message ##
    -    help.c: BUG() out if "help --guides" can't remove "git" prefixes
    +    help.c: refactor drop_prefix() to use a "switch" statement"
     
    -    Adjust code added in 929d9192828 (git docs: split "User-facing file
    -    formats" off from "Guides", 2021-06-04) to be more strict about the
    -    prefix trimming of the "guides" category.
    +    Refactor the drop_prefix() function in in help.c to make it easier to
    +    strip prefixes from categories that aren't "CAT_guide". There are no
    +    functional changes here, by doing this we make a subsequent functional
    +    change's diff smaller.
     
    -    There are no guides in the command-list.txt that don't start with
    -    "git", and we're unlikely to ever add any, if we do we can remove this
    -    BUG() invocation, but in the meantime this makes the intent more
    -    clear.
    +    As before we first try to strip "git-" unconditionally, if that works
    +    we'll return the stripped string. Then we'll strip "git" if the
    +    command is in "CAT_guide".
    +
    +    This means that we'd in principle strip "git-gitfoo" down to "foo" if
    +    it's in CAT_guide. That doesn't make much sense, and we don't have
    +    such an entry in command-list.txt, but let's preserve that behavior
    +    for now.
     
         While we're at it remove a stray newline that had been added after the
         "return name;" statement.
    @@ help.c: static struct category_description main_categories[] = {
      static const char *drop_prefix(const char *name, uint32_t category)
      {
      	const char *new_name;
    -+	const char *prefix;
    ++	const char *prefix = NULL;
      
      	if (skip_prefix(name, "git-", &new_name))
      		return new_name;
    @@ help.c: static struct category_description main_categories[] = {
     +	switch (category) {
     +	case CAT_guide:
     +		prefix = "git";
    -+		if (!skip_prefix(name, prefix, &new_name))
    -+			BUG("'%s' in category #%d should have '%s' prefix",
    -+			    name, category, prefix);
    - 		return new_name;
    ++		break;
     +	}
    - 	return name;
    --
    ++	if (prefix && skip_prefix(name, prefix, &new_name))
    + 		return new_name;
    +-	return name;
    + 
    ++	return name;
      }
      
      static void extract_cmds(struct cmdname_help **p_cmds, uint32_t mask)
 -:  ----------- >  2:  56429194634 help.c: remove common category behavior from drop_prefix() behavior
 2:  80322d44ea5 =  3:  2d6c00a51fa git help doc: use "<doc>" instead of "<guide>"
 3:  0d22eb645bd !  4:  8e9384a92f2 git docs: add a category for user-facing file, repo and command UX
    @@ help.c: static struct category_description main_categories[] = {
      };
      
     @@ help.c: static const char *drop_prefix(const char *name, uint32_t category)
    - 		return new_name;
    + 
      	switch (category) {
      	case CAT_guide:
     +	case CAT_userinterfaces:
      		prefix = "git";
    - 		if (!skip_prefix(name, prefix, &new_name))
    - 			BUG("'%s' in category #%d should have '%s' prefix",
    + 		break;
    + 	default:
     @@ help.c: void list_guides_help(void)
      	putchar('\n');
      }
 4:  c25f8ec9bf5 !  5:  4367c1e7f50 git docs: add a category for file formats, protocols and interfaces
    @@ help.c: static const char *drop_prefix(const char *name, uint32_t category)
      	case CAT_userinterfaces:
     +	case CAT_developerinterfaces:
      		prefix = "git";
    - 		if (!skip_prefix(name, prefix, &new_name))
    - 			BUG("'%s' in category #%d should have '%s' prefix",
    + 		break;
    + 	default:
     @@ help.c: void list_user_interfaces_help(void)
      	putchar('\n');
      }
 5:  466dbd2a993 =  6:  5adabbb3a26 docs: move commit-graph format docs to man section 5
 6:  9a551b2d53a =  7:  cfd1b0afb53 docs: move protocol-related docs to man section 5
 7:  92be18b95d9 =  8:  3505fa86039 docs: move pack format docs to man section 5
 8:  a8a883ebf85 !  9:  c4a7fe9d439 docs: move http-protocol docs to man section 5
    @@ command-list.txt: gitmodules                              userinterfaces
      gitnamespaces                           guide
      gitprotocol-capabilities                developerinterfaces
      gitprotocol-common                      developerinterfaces
    -+gitprotocol-http                       developerinterfaces
    ++gitprotocol-http                        developerinterfaces
      gitprotocol-pack                        developerinterfaces
      gitprotocol-v2                          developerinterfaces
      gitremote-helpers                       guide
 9:  ecfda8c6770 = 10:  8baf1db4d30 docs: move multi-pack-index docs to man section 5