I have an (excerpted) macro that looks like this:
$ cat x
#! /bin/bash
m4 -P <<'eof!'
m4_define(LINKS, `hrf(flquotes-m4_eval($1 + 1).html, m4_eval($1 + 1))')
LINKS(2025)
eof!
$
It works fine
$ ./x
hrf(flquotes-2026.html, 2026)
$
except in the full macro I call hrf() all over the place and I'd like to
replace that detailed structure with a call to a macro (and I'd like to avoid
repeating the call to m4_eval()). Done easily enough:
$ cat ./x
#! /bin/bash
m4 -P <<'eof!'
m4_define(LNK, `hrf(flquotes-$1.html, $1)')
m4_define(LINKS, `LNK(m4_eval($1 + 1))')
LINKS(2025)
eof!
$ ./x
hrf(flquotes-2026.html, 2026)
$
But LNK() is scoped to LINKS() and I'd like the code to reflect that. Seems
easy too:
$ cat x
#! /bin/bash
m4 -P <<'eof!'
m4_define(LINKS,
`m4_define(LNK, `hrf(flquotes-$1.html, $1)')
LNK(m4_eval($1 + 1))
m4_undefine(`LNK')
')
LINKS(2025)
eof!
$ ./x
hrf(flquotes-2025.html, 2025)
$
except it doesn't work. It seems $1 in LNK() is being bound at definition
time, and I can't figure out a quoting structure to delay the binding to call
time. Is that sort of thing possible, and if so, how do I do it?
$ m4 --version
m4 (GNU M4) 1.4.19
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by René Seindal.
$
