WIP _units

[christopher@xxxxxxxxx]

Hello,

i'm trying to update _units to allow completion for e.g. `units area_<TAB>`
which currently breaks with the underscore. I couldn't make out what i have
to add to compadd to make this work.
Any suggestions?

Subject: [PATCH] _units

* include new files which can be updated via units_cur from
  /var/lib/units.
* allow completion for units with an underscore in their name.
---
 Completion/Unix/Command/_units | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/Completion/Unix/Command/_units b/Completion/Unix/Command/_units
index 6d86f4dc3..980661514 100644
--- a/Completion/Unix/Command/_units
+++ b/Completion/Unix/Command/_units
@@ -38,14 +38,15 @@ compset -S '[^[:alnum:]]*'
 local datfile
 local -a testfiles
 testfiles=(
-  /usr/share/units.dat		# GNU on Fedora
-  /usr/share/units/units.dat    # on gentoo
-  /usr/share/units/definitions.units # on Debian, units 2.00 and newer
-  /usr/local/share/units.dat    # GNU DIY install
-  /usr/share/lib/unittab	# Solaris
-  /usr/share/misc/units.lib     # OpenBSD [as of 2020]; also FreeBSD 9.1
-  /usr/share/misc/definitions.units     # FreeBSD 12.1
-  /usr/share/misc/units.dat     # on Debian, units 1.88 and older
+  /usr/share/units.dat                # GNU on Fedora
+  /usr/share/units/units.dat          # on gentoo
+  /usr/share/units/definitions.units  # on Debian, units 2.00 and newer
+  /var/lib/units/*.units              # on Debian, updates via units_cur
+  /usr/local/share/units.dat          # GNU DIY install
+  /usr/share/lib/unittab              # Solaris
+  /usr/share/misc/units.lib           # OpenBSD [as of 2020]; also FreeBSD 9.1
+  /usr/share/misc/definitions.units   # FreeBSD 12.1
+  /usr/share/misc/units.dat           # on Debian, units 1.88 and older
 )
 
 datfile=${opt_args[-f]:-${opt_args[--file]}}
@@ -67,7 +68,7 @@ all=($(awk '$1 !~ /^[\/#]/ { print $1 }' $datfile))
 # prefixes end in a -
 pfxs=(${${all:#^[[:alnum:]]##-}%%-})
 # units may include regular or piecewise linear functions
-units=(${${all:#^[[:alnum:]]##([\(\]]*|)}%%\(*})
+units=(${${all:#^[0-9A-z_]##([\(\]]*|)}%%\(*})
 
 if (( ${#units} )); then
   _alternative 'unitprefixes:unit prefix:compadd -S "" -a pfxs' \
-- 
2.53.0