42931: completion for several utilities especially for checksums across a variety of systems

Completion/Unix/Command/_md5sum

@@ -1,15 +1,48 @@
-#compdef md5sum gmd5sum
+#compdef md5sum gmd5sum b2sum gb2sum sha1sum gsha1sum sha224sum gsha224sum sha256sum gsha256sum sha384sum gsha384sum sha512sum gsha512sum
 
-_arguments -S \
-  '(-b --binary)'{-b,--binary}'[read in binary mode]' \
-  '(-c --check)'{-c,--check}'[read MD5 sums from the FILEs and check them]' \
-  '--tag[create a BSD-style checksum]' \
-  '(-t --text)'{-t,--text}'[read in text mode]' \
-  "--ignore-missing[don't fail or report status for missing files]" \
-  '(-q --quiet)'{-q,--quiet}"[don't print OK for each successfully verified file]" \
-  '--status[no output, status code shows success]' \
-  '--strict[exit non-zero for improperly formatted checksum lines]' \
-  '(-w --warn)'{-w,--warn}'[warn about improperly formatted checksum lines]' \
-  '(-)--help[display help and exit]' \
-  '(-)--version[output version information and exit]' \
-  '*:files:_files'
+# This function covers the various digest utilities (which are all essentially
+# the same program) from GNU Coreutils. It does NOT cover GNU `cksum` and `sum`,
+# nor the various BSD digest utilities like `md5` and `sha1` — see `_cksum` for
+# all of those. See `_shasum` for the `shasum` Perl script.
+#
+# @todo Support BusyBox?
+
+local type
+local -a args
+
+case $service in
+  *md5*) type=MD5 ;;
+  *b2*)  type=BLAKE2 ;;
+  *sha*) type=SHA${service//[^0-9]/} ;;
+esac
+
+# General options
+args+=(
+  '(: -)--help[display help information]'
+  '(: -)--version[display version information]'
+)
+# Summing options
+args+=(
+  + sum
+  '(chk)--tag[create BSD-style checksums]'
+  '(chk -b -t --binary --text)'{-b,--binary}'[read in binary mode]'
+  '(chk -b -t --binary --text)'{-t,--text}'[read in text mode]'
+)
+# This is the only option that differs amongst all of these tools
+[[ $service == *b2* ]] && args+=(
+  '(chk -l --length)'{-l+,--length=}'[specify digest length]:digest length (bits, multiples of 8)'
+)
+# Verification options
+args+=(
+  + chk
+  '(sum -c --check)'{-c,--check}"[verify $type checksums from input files]"
+  "(sum)--ignore-missing[don't fail or report status for missing files]"
+  "(sum)--quiet[don't print OK for each verified file]"
+  '(sum -w --warn)--status[suppress all output]'
+  '(sum)--strict[exit non-zero for improperly formatted checksum lines]'
+  '(sum -w --status --warn)'{-w,--warn}'[warn about each improperly formatted checksum line]'
+)
+# Operands
+args+=( '*: :_files' )
+
+_arguments -s -S : $args