Re: fr/vimdiff-layout (was: What's cooking in git.git (Mar 2022, #05; Wed, 23))

[Fernando Ramos <greenfoo@u92.eu>]

> It looks like it's emitting a new warning from the "Makefile" in
> check-docs:
> 	
> 	$ (make clean && make check-docs) >/dev/null 2>&1; make check-docs
> 	make -C Documentation lint-docs
> 	make[1]: Entering directory '/home/avar/g/git/Documentation'
> 	make[1]: Nothing to be done for 'lint-docs'.
> 	make[1]: Leaving directory '/home/avar/g/git/Documentation'
> 	removed but documented: git-difftool--vimdiff
> 	removed but documented: git-mergetool--vimdiff
> 	removed but documented: git-version

Looking at how the Makefile works it looks like this error is triggered
because...

  1. I have created these two new files:
     - Documentation/git-difftool--vimdiff.txt
     - Documentation/git-mergetool--vimdiff.txt

  2. None of them are real programs (such as "git-clone") or scripts (such as
     "git-mergetool--lib.sh")

All the other "Documentation/*.txt" files are associated to "something" that
can be executed, but not these two (they are only meant to be accessed from "git
help" / "man").

Options I can think of:

  A) Ignore the warning message

  B) Remove these two files and add all this documentation to an already
     existing one (maybe "Documentation/git-mergetool--lib.txt")

  C) Create a new variable in the Makefile to contain a list of "documentation
     aliases" that do not correspond to a "real" command, so that they can be
     filtered out when testing for documentation problems.

In other to implement (C) we could do something like this:

> diff --git a/Makefile b/Makefile
> index 70f0a004e7..db8a1c8025 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -597,6 +597,7 @@ TEST_BUILTINS_OBJS =
>  TEST_OBJS =
>  TEST_PROGRAMS_NEED_X =
>  THIRD_PARTY_SOURCES =
> +DOC_ALIASES =
> 
>  # Having this variable in your environment would break pipelines because
>  # you cause "cd" to echo its destination to stdout.  It can also take
> @@ -1228,6 +1229,11 @@ THIRD_PARTY_SOURCES += compat/regex/%
>  THIRD_PARTY_SOURCES += sha1collisiondetection/%
>  THIRD_PARTY_SOURCES += sha1dc/%
> 
> +# DOC ALIASES is a list of topics you can call "git help" on but they are no
> +# real commands or scripts you can execute
> +DOC_ALIASES += git-difftool--vimdiff
> +DOC_ALIASES += git-mergetool--vimdiff
> +
>  # xdiff and reftable libs may in turn depend on what is in libgit.a
>  GITLIBS = common-main.o $(LIB_FILE) $(XDIFF_LIB) $(REFTABLE_LIB) $(LIB_FILE)
>  EXTLIBS =
> @@ -3355,7 +3361,7 @@ check-docs::
>                     -e 's/\.txt//'; \
>         ) | while read how cmd; \
>         do \
> -               case " $(patsubst %$X,%,$(ALL_COMMANDS) $(BUILT_INS) $(EXCLUDED_PROGRAMS)) " in \
> +               case " $(patsubst %$X,%,$(ALL_COMMANDS) $(BUILT_INS) $(EXCLUDED_PROGRAMS) $(DOC_ALIASES)) " in \
>                 *" $$cmd "*)    ;; \
>                 *) echo "removed but $$how: $$cmd" ;; \
>                 esac; \

Let me know what you think. Thanks!