Merge branch 'ab/tech-docs-to-help'

Expose a lot of "tech docs" via "git help" interface.

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

Author: gitster

Documentation/Makefile

@@ -24,10 +24,21 @@ MAN1_TXT += gitweb.txt
 
 # man5 / man7 guides (note: new guides should also be added to command-list.txt)
 MAN5_TXT += gitattributes.txt
+MAN5_TXT += gitformat-bundle.txt
+MAN5_TXT += gitformat-chunk.txt
+MAN5_TXT += gitformat-commit-graph.txt
+MAN5_TXT += gitformat-index.txt
+MAN5_TXT += gitformat-pack.txt
+MAN5_TXT += gitformat-signature.txt
 MAN5_TXT += githooks.txt
 MAN5_TXT += gitignore.txt
 MAN5_TXT += gitmailmap.txt
 MAN5_TXT += gitmodules.txt
+MAN5_TXT += gitprotocol-capabilities.txt
+MAN5_TXT += gitprotocol-common.txt
+MAN5_TXT += gitprotocol-http.txt
+MAN5_TXT += gitprotocol-pack.txt
+MAN5_TXT += gitprotocol-v2.txt
 MAN5_TXT += gitrepository-layout.txt
 MAN5_TXT += gitweb.conf.txt
 
@@ -95,26 +106,16 @@ TECH_DOCS += MyFirstObjectWalk
 TECH_DOCS += SubmittingPatches
 TECH_DOCS += ToolsForGit
 TECH_DOCS += technical/bitmap-format
-TECH_DOCS += technical/bundle-format
-TECH_DOCS += technical/cruft-packs
 TECH_DOCS += technical/hash-function-transition
-TECH_DOCS += technical/http-protocol
-TECH_DOCS += technical/index-format
 TECH_DOCS += technical/long-running-process-protocol
 TECH_DOCS += technical/multi-pack-index
-TECH_DOCS += technical/pack-format
 TECH_DOCS += technical/pack-heuristics
-TECH_DOCS += technical/pack-protocol
 TECH_DOCS += technical/parallel-checkout
 TECH_DOCS += technical/partial-clone
-TECH_DOCS += technical/protocol-capabilities
-TECH_DOCS += technical/protocol-common
-TECH_DOCS += technical/protocol-v2
 TECH_DOCS += technical/racy-git
 TECH_DOCS += technical/reftable
 TECH_DOCS += technical/send-pack-pipeline
 TECH_DOCS += technical/shallow
-TECH_DOCS += technical/signature-format
 TECH_DOCS += technical/trivial-merge
 SP_ARTICLES += $(TECH_DOCS)
 SP_ARTICLES += technical/api-index
@@ -290,6 +291,8 @@ cmds_txt = cmds-ancillaryinterrogators.txt \
 	cmds-synchingrepositories.txt \
 	cmds-synchelpers.txt \
 	cmds-guide.txt \
+	cmds-developerinterfaces.txt \
+	cmds-userinterfaces.txt \
 	cmds-purehelpers.txt \
 	cmds-foreignscminterface.txt
 

Documentation/config/lsrefs.txt

@@ -1,7 +1,7 @@
 lsrefs.unborn::
 	May be "advertise" (the default), "allow", or "ignore". If "advertise",
 	the server will respond to the client sending "unborn" (as described in
-	protocol-v2.txt) and will advertise support for this feature during the
+	linkgit:gitprotocol-v2[5]) and will advertise support for this feature during the
 	protocol v2 capability advertisement. "allow" is the same as
 	"advertise" except that the server will not advertise support for this
 	feature; this is useful for load-balanced servers that cannot be

Documentation/config/pack.txt

@@ -166,7 +166,7 @@ permuted into their appropriate location when writing a new bitmap.
 
 pack.writeReverseIndex::
 	When true, git will write a corresponding .rev file (see:
-	link:../technical/pack-format.html[Documentation/technical/pack-format.txt])
+	linkgit:gitformat-pack[5])
 	for each new packfile that it writes in all places except for
 	linkgit:git-fast-import[1] and in the bulk checkin mechanism.
 	Defaults to false.

Documentation/config/protocol.txt

@@ -58,6 +58,6 @@ protocol.version::
 * `1` - the original wire protocol with the addition of a version string
   in the initial response from the server.
 
-* `2` - link:technical/protocol-v2.html[wire protocol version 2].
+* `2` - Wire protocol version 2, see linkgit:gitprotocol-v2[5].
 
 --

Documentation/git-bundle.txt

@@ -56,10 +56,8 @@ using "thin packs", bundles created using exclusions are smaller in
 size. That they're "thin" under the hood is merely noted here as a
 curiosity, and as a reference to other documentation.
 
-See link:technical/bundle-format.html[the `bundle-format`
-documentation] for more details and the discussion of "thin pack" in
-link:technical/pack-format.html[the pack format documentation] for
-further details.
+See linkgit:gitformat-bundle[5] for more details and the discussion of
+"thin pack" in linkgit:gitformat-pack[5] for further details.
 
 OPTIONS
 -------
@@ -77,7 +75,7 @@ verify <file>::
 	commits exist and are fully linked in the current repository.
 	Then, 'git bundle' prints a list of missing commits, if any.
 	Finally, information about additional capabilities, such as "object
-	filter", is printed. See "Capabilities" in link:technical/bundle-format.html
+	filter", is printed. See "Capabilities" in linkgit:gitformat-bundle[5]
 	for more information. The exit code is zero for success, but will
 	be nonzero if the bundle file is invalid.
 
@@ -337,6 +335,11 @@ You can also see what references it offers:
 $ git ls-remote mybundle
 ----------------
 
+FILE FORMAT
+-----------
+
+See linkgit:gitformat-bundle[5].
+
 GIT
 ---
 Part of the linkgit:git[1] suite

Documentation/git-commit-graph.txt

@@ -143,6 +143,11 @@ $ git rev-parse HEAD | git commit-graph write --stdin-commits --append
 ------------------------------------------------
 
 
+FILE FORMAT
+-----------
+
+see linkgit:gitformat-commit-graph[5].
+
 GIT
 ---
 Part of the linkgit:git[1] suite

Documentation/git-help.txt

@@ -9,14 +9,16 @@ SYNOPSIS
 --------
 [verse]
 'git help' [-a|--all] [--[no-]verbose] [--[no-]external-commands] [--[no-]aliases]
-'git help' [[-i|--info] [-m|--man] [-w|--web]] [<command>|<guide>]
+'git help' [[-i|--info] [-m|--man] [-w|--web]] [<command>|<doc>]
 'git help' [-g|--guides]
 'git help' [-c|--config]
+'git help' [--user-interfaces]
+'git help' [--developer-interfaces]
 
 DESCRIPTION
 -----------
 
-With no options and no '<command>' or '<guide>' given, the synopsis of the 'git'
+With no options and no '<command>' or '<doc>' given, the synopsis of the 'git'
 command and a list of the most commonly used Git commands are printed
 on the standard output.
 
@@ -26,8 +28,8 @@ printed on the standard output.
 If the option `--guides` or `-g` is given, a list of the
 Git concept guides is also printed on the standard output.
 
-If a command, or a guide, is given, a manual page for that command or
-guide is brought up. The 'man' program is used by default for this
+If a command or other documentation is given, the relevant manual page
+will be brought up. The 'man' program is used by default for this
 purpose, but this can be overridden by other options or configuration
 variables.
 
@@ -69,6 +71,23 @@ OPTIONS
 --guides::
 	Prints a list of the Git concept guides on the standard output.
 
+--user-interfaces::
+	Prints a list of the repository, command and file interfaces
+	documentation on the standard output.
++
+In-repository file interfaces such as `.git/info/exclude` are
+documented here (see linkgit:gitrepository-layout[5]), as well as
+in-tree configuration such as `.mailmap` (see linkgit:gitmailmap[5]).
++
+This section of the documentation also covers general or widespread
+user-interface conventions (e.g. linkgit:gitcli[7]), and
+pseudo-configuration such as the file-based `.git/hooks/*` interface
+described in linkgit:githooks[5].
+
+--developer-interfaces::
+	Print list of file formats, protocols and other developer
+	interfaces documentation on the standard output.
+
 -i::
 --info::
 	Display manual page for the command in the 'info' format. The

Documentation/git-multi-pack-index.txt

@@ -128,8 +128,8 @@ $ git multi-pack-index verify
 SEE ALSO
 --------
 See link:technical/multi-pack-index.html[The Multi-Pack-Index Design
-Document] and link:technical/pack-format.html[The Multi-Pack-Index
-Format] for more information on the multi-pack-index feature.
+Document] and linkgit:gitformat-pack[5] for more information on the
+multi-pack-index feature and its file format.
 
 
 GIT

Documentation/git-upload-pack.txt

@@ -39,10 +39,9 @@ OPTIONS
 --http-backend-info-refs::
 	Used by linkgit:git-http-backend[1] to serve up
 	`$GIT_URL/info/refs?service=git-upload-pack` requests. See
-	"Smart Clients" in link:technical/http-protocol.html[the HTTP
-	transfer protocols] documentation and "HTTP Transport" in
-	link:technical/protocol-v2.html[the Git Wire Protocol, Version
-	2] documentation. Also understood by
+	"Smart Clients" in linkgit:gitprotocol-http[5] and "HTTP
+	Transport" in in the linkgit:gitprotocol-v2[5]
+	documentation. Also understood by
 	linkgit:git-receive-pack[1].
 
 <directory>::

Documentation/git.txt

@@ -339,6 +339,23 @@ The following documentation pages are guides about Git concepts.
 
 include::cmds-guide.txt[]
 
+Repository, command and file interfaces
+---------------------------------------
+
+This documentation discusses repository and command interfaces which
+users are expected to interact with directly. See `--user-formats` in
+linkgit:git-help[1] for more details on the critera.
+
+include::cmds-userinterfaces.txt[]
+
+File formats, protocols and other developer interfaces
+------------------------------------------------------
+
+This documentation discusses file formats, over-the-wire protocols and
+other git developer interfaces. See `--developer-interfaces` in
+linkgit:git-help[1].
+
+include::cmds-developerinterfaces.txt[]
 
 Configuration Mechanism
 -----------------------