[groff] 33/127: [mm]: Make "mmroff" honor `GROFF_BIN_PATH`.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit b81ebb2457e0fa96eab14faa583e368bc00016ec
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Tue Jul 4 11:40:01 2023 -0500

    [mm]: Make "mmroff" honor `GROFF_BIN_PATH`.
    
    * contrib/mm/mmroff.pl: Honor `GROFF_BIN_PATH` environment variable.
    * contrib/mm/mmroff.1.man (Environment): Add section documenting this.
---
 contrib/mm/ChangeLog    |  5 +++++
 contrib/mm/mmroff.1.man | 26 ++++++++++++++++++++++++++
 contrib/mm/mmroff.pl    | 24 +++++++++++++++++++++---
 3 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/contrib/mm/ChangeLog b/contrib/mm/ChangeLog
index db91d6063..5d9cc6cb6 100644
--- a/contrib/mm/ChangeLog
+++ b/contrib/mm/ChangeLog
@@ -1,3 +1,8 @@
+2023-07-04  G. Branden Robinson <g.branden.robinson@gmail.com>
+
+       * mmroff.pl: Honor `GROFF_BIN_PATH` environment variable.
+       * mmroff.1.man (Environment): Add section documenting this.
+
 2023-07-04  G. Branden Robinson <g.branden.robinson@gmail.com>
 
        * mmroff.pl: Trivially refactor.  Rename scalars.
diff --git a/contrib/mm/mmroff.1.man b/contrib/mm/mmroff.1.man
index 7920c709d..526edef63 100644
--- a/contrib/mm/mmroff.1.man
+++ b/contrib/mm/mmroff.1.man
@@ -134,6 +134,32 @@ Create or update the cross-reference file and exit.
 .
 .
 .\" ====================================================================
+.SH Environment
+.\" ====================================================================
+.
+Normally,
+the path separator in environment variables ending with
+.I PATH
+is the colon;
+this may vary depending on the operating system.
+.
+For example,
+Windows uses a semicolon instead.
+.
+.
+.TP
+.I GROFF_BIN_PATH
+is a colon-separated list of directories in which to search for the
+.I groff
+executable before searching in
+.IR PATH .
+.
+If unset,
+.I @BINDIR@
+is used.
+.
+.
+.\" ====================================================================
 .SH Authors
 .\" ====================================================================
 .
diff --git a/contrib/mm/mmroff.pl b/contrib/mm/mmroff.pl
index 3cdf8fd87..bcd86ab83 100644
--- a/contrib/mm/mmroff.pl
+++ b/contrib/mm/mmroff.pl
@@ -1,5 +1,5 @@
 #!@PERL@
-# Copyright (C) 1989-2020 Free Software Foundation, Inc.
+# Copyright (C) 1989-2023 Free Software Foundation, Inc.
 #
 # This file is part of groff.
 #
@@ -19,6 +19,8 @@
 use strict;
 use warnings;
 
+use Config;
+
 (my $progname = $0) =~s @.*/@@;
 
 # runs groff in safe mode, that seems to be the default
@@ -47,10 +49,26 @@ if (grep(/^-x$/, @ARGV)) {
        @ARGV = grep(!/^-x$/, @ARGV);
 }
 
+# Locate groff executable.
+my $path = $ENV{'GROFF_BIN_PATH'};
+my $groff;
+
+if ($path) {
+       for my $dir (split($Config{path_sep}, $path)) {
+               my $candidate = "$dir/groff";
+               if (-x $candidate) {
+                       $groff = $candidate;
+                       last;
+               }
+       }
+}
+
+$groff = "groff" if (!$groff);
+
 # mmroff should always have -mm, but not twice
 @ARGV = grep(!/^-mm$/, @ARGV);
-my $first_pass = "groff -rRef=1 -z -mm @ARGV";
-my $second_pass = "groff -mm @ARGV";
+my $first_pass = "$groff -rRef=1 -z -mm @ARGV";
+my $second_pass = "$groff -mm @ARGV";
 
 my (%cur, $rfilename, $max_height, $imacro, $max_width, @out, @indi);
 open(MACRO, "$first_pass 2>&1 |") || die "run $first_pass:$!";