shell scirpt to list git tags along with their description and an annotation indicator ([t] for annotated/signed and [c] for unsigned/annotated)

git-tls.sh

#!/usr/bin/env bash

FMT=$'--pretty=format:{}%x1f%C(bold yellow) %h%C(bold blue) %ae%Creset: %s %C(bold black)%ar%Creset%n'
git tag -l | xargs -rn1 -I{} git log -1 "$FMT" {} | while read X
do commit="$(cut -d $'\x1f' -f1 <<< "$X")"
   description="$(cut -d $'\x1f' -f2 <<< "$X")"

   # use cat-file -t to add add [c] or [t]
   #
   # Wait, but why??
   #
   # If the tag is annotated, cat-file -t gives "tag". If the tag is signed,
   # cat-file -t gives "tag" (because the signature is an annotation). If the
   # tag is neither signed nor annotated, then cat-file -t gives "commit"
   #
   # The question we're really asking is: is this tag signed
   # What we *should* be asking is: does verification of this tag check out?
   # (We almost never check this, I probably don't have your signing key in my
   # web of trust.)
   #
   # So [c] and [t] act as proxies for whether the tag is signed...
   # useful? not really, except that by default git-describe considers
   # annotated tags worth mentioning and non-annotated tags as not worth
   # mentioning. Probably the describe folks used annotations as a proxy for
   # "good" like we do.

   echo "$commit [$(git cat-file -t "$commit" | colrm 2)] $description"
done