Re: [nmh-workers] Handling empty components

[Ken Hornstein]

>... Though, if you would like me to test this (and see if I can
>come up with format code that is not ridiculously complex/long)
>to see if it solves my particular issue (which it seems like it
>should), I'm happy to pull down and build from sources!

If you want to build from HEAD, that's an option (we don't run that
through testing like we do for a release, though).  But you could always
pull down the sources from 1.7.1 and apply the patch; it really is one
line (see below).  I think wrapping every component in a %(trimr) function
would do it.

--Ken

commit 9530e8f7f96f79ebe9afaeeecf0f2a2b373bb429
Author: Ken Hornstein <address@hidden>
Date:   Fri Mar 22 11:59:04 2019 -0400

    Add support for %(trimr) format function
    
    Add support for a %(trimr) format function, which behaves exactly
    like %(trim) but also returns a string.  Turns out this is literally
    a one-line change that does not require a new format instruction.

diff --git a/man/mh-format.man b/man/mh-format.man
index 104b8212..8b43eda6 100644
--- a/man/mh-format.man
+++ b/man/mh-format.man
@@ -285,6 +285,7 @@ decode      expr    string  decode \fIstr\fR as RFC 2047 
(MIME-encoded)
                        component
 unquote        expr    string  remove RFC 2822 quotes from \fIstr\fR
 trim   expr            trim trailing whitespace from \fIstr\fR
+trimr  expr    string  Like %(trim), also returns string
 kilo   expr    string  express in SI units: 15.9K, 2.3M, etc.
                        %(kilo) scales by factors of 1000,
 kibi   expr    string  express in IEC units: 15.5Ki, 2.2Mi.
diff --git a/sbr/fmt_compile.c b/sbr/fmt_compile.c
index e8a80279..3ada1d41 100644
--- a/sbr/fmt_compile.c
+++ b/sbr/fmt_compile.c
@@ -160,6 +160,7 @@ static struct ftable functable[] = {
      { "decodecomp", TF_COMP,  FT_LS_DECODECOMP, 0,            TFL_PUTS },
      { "decode",     TF_EXPR,  FT_LS_DECODE,   0,              TFL_PUTS },
      { "trim",       TF_EXPR,  FT_LS_TRIM,     0,              0 },
+     { "trimr",      TF_EXPR,  FT_LS_TRIM,     0,              TFL_PUTS },
      { "kilo",       TF_EXPR,  FT_LS_KILO,     0,              TFL_PUTS },
      { "kibi",       TF_EXPR,  FT_LS_KIBI,     0,              TFL_PUTS },
      { "compval",    TF_COMP,  FT_LV_COMP,     0,              TFL_PUTN },