Tool to generate graphs of Go module dependencies

gomodgraph

#!/usr/bin/env bash
# Based on https://github.com/go-modules-by-example/index/blob/master/014_mod_graph/README.md

OPEN=0
TYPE=svg
case "$1" in
-)
  OUT=/dev/stdout
  ;;
'')
  OUT="$(mktemp deps.XXXXXXXXXX.svg)"
  OPEN=1
  ;;
*.*)
  OUT="$1"
  TYPE="${1##*.}"
  ;;
*)
  OUT="$1"
  ;;
esac

go mod graph |
  sed -Ee 's/@[^[:blank:]]+//g' |
  sort | uniq |
  awk '
    BEGIN {
      print "digraph {"
      print "  graph [rankdir=TB, overlap=false];"
    }
    {
      printf "  \"%s\" -> \"%s\"\n", $1, $2
    }
    END {
      print "}"
    }
  ' |
  twopi "-T${TYPE}" -o "$OUT" /dev/stdin

if [ $OPEN = 0 ]; then
  exit 0
fi

# Give the program in question one second to load the file before
# unlinking the file because scattering the earth with tons of SVGs
# isn't polite (even if your /tmp is tmpfs).
trap 'sleep 1; rm -v "$OUT"' EXIT
case "$(uname | tr A-Z a-z)" in
linux) xdg-open "$OUT" ;;
darwin) open "$OUT" ;;
*) cat "$OUT" ;;
esac