aux/workflow/manpages.sh: Refactor how manpages and translations are made

I didn't like the previous version of aux/workflow/manpages.sh mainly for 2 reasons:
1. its CLI was terrible, ugly and fragile;
2. it mixed handling manpages and handling *translations*.

The first step was to split the translations part to a different file:
aux/workflow/l10n.sh.  Now it has the base logic for running po4a, and
can apply it to manpages.  It is useful for updating translated files
in other scenarios, such as catgets() message catalogs, markdown files,
etc.

After I used the venerable getopts to handle the command line
arguments, and give aux/workflow/manpages.sh a saner interface.

I disliked the fact that aux/workflow/manpages.sh still is being used
for the "install" and "uninstall" targets.  Before this file, the
canonical workflow of "make && make install/uninstall" was 100%
embedded within the Makefile itself.  But now the Makefile calls to an
external script for that.  This isn't a real cost, other than how
obvious the behaviour is for someone looking at the Makefile for the
first time.

I still chose to do it anyway, because there was already too many
things in the Makefile itself, and it was getting worse with time.  I
made sure to never cross the line of relying on an external tool for
the canonical "make && make install/uninstall", and even for
"make check".  Those all work without requiring any extra tool outside
what POSIX defines, such as "sed", "awk", etc.  Despite the cost of
adding this detour from the liner Makefile flow, I found it to be worth
it to call to the external script, as this script can now also be
shared across projects, and the customized Makefile be made simpler.

In other to remove the "-- $(do_subst)" horrendous hack, I chose to use
an inference rule for ".in" files, and remove the "$(do_subst)"
variable altogether.  Now all the files that need to go through sed
should end in ".in", and the Makefile will take care of producing it.
The upside is that this model is much better integrater into make
itself.

Addresses #task-9ee2bbc8-295f-52b7-4104-483869bad017.

1 files changed, 0 insertions, 190 deletions

diff --git a/doc/git-permalink.en.1 b/doc/git-permalink.en.1
deleted file mode 100644
index 63d8f0e..0000000
--- a/doc/git-permalink.en.1
+++ /dev/null
@@ -1,190 +0,0 @@
-.TH GIT-PERMALINK 1 @DATE@ "git-permalink @VERSION@" "git-permalink user manual"
-
-
-.SH NAME
-
-git-permalink - Git extension to generate web permalinks of files in a repository.
-
-
-.SH SYNOPSIS
-
-\fBgit-permalink\fR [\fIOPTIONS\fR] \fIFILE\fR [\fILINENO\fR]
-
-
-.SH DESCRIPTION
-
-\fBgit-permalink\fR will use Git itself to get a) the commit at \fIHEAD\fR and b) the \fIremote.origin.url\fR via \fBgit-config\fR(1), and optionally c) an URL template override.
-It then uses those values to build a permalink URL, with the commit included on it to ensure it is \fIpermanent\fR, and optionally the line number of the selected file.
-
-\fBgit-permalink\fR then uses \fBxdg-open\fR(1) to open the URL.
-
-.SH OPTIONS
-
-.TP
-\fB-p\fR
-Only print the web URL link to STDOUT, don't try to open it with \fBxdg-open\fR(1) or do anything else.
-By default this is turned off.
-
-.TP
-\fB--help\fR, \fB-h\fR
-Show show help text.
-
-.TP
-\fB--version\fR, \fB-V\fR
-Show version number.
-
-
-.SH CONFIGURATION
-
-.SS SUPPORTED REMOTES
-
-The current supported remotes are:
-
-.RS
-.IP \(bu
-git.euandreh.xyz (where git-permalink itself is hosted =p)
-.IP \(bu
-sourcehut
-.IP \(bu
-git.kernel.org
-.IP \(bu
-savannah
-.IP \(bu
-notabug
-.IP \(bu
-codeberg
-.IP \(bu
-bitbucket
-.IP \(bu
-pagure
-.IP \(bu
-gitlab
-.IP \(bu
-github
-.RE
-
-Patches to add support for more source code forges are welcome!
-
-See
-.UR https://euandreh.xyz/git-permalink/TODOs.html#task-cebc5298-17ad-5c60-dfa5-a25b66433a3a
-#task-cebc5298-17ad-5c60-dfa5-a25b66433a3a
-.UE
-for discussion and more information.
-
-.SS OVERRIDES
-
-If you want to configure the permalink URL template for a project with an unsupported origin you can do so via \fBgit-config\fR(1).
-
-There are two configuration options available:
-
-.TP
-\fBgit-permalink.template-file-commit\fR
-An URL template where the name of the \fIfile\fR comes first, and the \fIcommit\fR comes second.
-cgit uses this style of URL, with something like in:
-
-.nf
-	https://git.euandreh.xyz/fallible/tree/%s?id=%s
-.fi
-
-On this example, the name of the \fIfile\fR comes first and \fIcommit\fR comes at the very end after "id=".
-
-.TP
-\fBgit-permalink.template-commit-file\fR
-An URL template where the \fIcommit\fR comes first, and the name of the \fIfile\fR comes second.
-sourcehut uses this style of URL, with something like:
-
-.nf
-	https://git.sr.ht/~sircmpwn/scdoc/tree/%s/item/%s
-.fi
-
-On this example, the \fIcommit\fR comes first on the URL path, and the \fIfile\fR name comes at the end.
-
-.P
-If none of those values are found by \fBgit-config\fR(1) and \fBgit-permalink\fR can't guess the URL, it exits with an error.
-
-
-.SH EXAMPLES
-
-Open \fIsrc/fold.c\fR of a project with its origin pointing to \fIsourcehut\fR:
-
-.nf
-	$ git permalink src/fold.c 125
-	Opening https://git.sr.ht/~sircmpwn/ctools/tree/fbf17d92f5ed1c38983f73df912f051ad0f9ef2d/item/src/fold.c#L125
-.fi
-
-Generate link for lines 59 through 94 of \fInongnu/packages/clojure.scm\fR on a project hosted on \fIgitlab\fR, but only print it \fIwithout\fR opening with \fBxdg-open\fR(1):
-
-.nf
-	$ git permalink -p nongnu/packages/clojure.scm 59-94
-	https://gitlab.com/nonguix/nonguix/-/blob/c9d7f30bcbd3a6e3076e56a972c33963c73c4d58/nongnu/packages/clojure.scm#L59-94
-.fi
-
-.P
-Configure an URL override, and open the file \fIsrc/app_add.c\fR without selecting an specific line:
-
-.nf
-	$ git config git-permalink.template-file-commit 'https://git.alpinelinux.org/apk-tools/tree/%s?id=%s'
-	$ git permalink src/app_add.c
-	Opening https://git.alpinelinux.org/apk-tools/tree/src/app_add.c?id=aeeb119fd8652c044cd5ceebce572b5c716914e3
-.fi
-
-.P
-Open file called \fI--help\fR:
-
-.nf
-	$ git permalink -- --help
-	Opening https://git.euandreh.xyz/non-existent-repository/tree/--help?id=470a9fa9329495cfcbef8cc5e32e3a38d3c3103e
-.fi
-
-.SH EXIT STATUS
-
-.TP
-.B 0
-Successful execution.
-
-.TP
-.B 1
-Unsupported remote.
-See the supported list in SUPPORTED REMOTES, and how to add custom ones in OVERRIDES.
-
-.TP
-.B 2
-Invalid arguments.
-
-
-.SH SEE ALSO
-
-\fBgit-config\fR(1)
-\fBxdg-open\fR(1)
-
-
-.SH AUTHORS
-
-.MT eu@euandre.org
-EuAndreh
-.ME
-and contributors.
-
-
-.SH BUGS
-
-.IP \(bu
-Report bugs to the
-.MT ~euandreh/public\-inbox@lists.sr.ht
-mailing list
-.ME .
-Use the subject "\f(CR[git\-permalink] BUG or TASK:
-<description>\fR".
-.IP \(bu
-Browse bugs
-.UR https://euandreh.xyz/git\-permalink/TODOs.html
-online
-.UE .
-.IP \(bu
-.UR https://euandreh.xyz/git\-permalink/
-Homepage
-.UE .
-.IP \(bu
-.UR https://lists.sr.ht/~euandreh/public\-inbox?search=%5Bgit\-permalink%5D
-Comments and discussions
-.UE .