go: print-hashes script

- convert to nix-shell
- shellcheck / shfmt fixes

pkgs/development/compilers/go/print-hashes.sh

@@ -1,15 +1,16 @@
-#!/usr/bin/env bash
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash -p curl jq
+# shellcheck shell=bash
 set -euo pipefail
 
 BASEURL=https://go.dev/dl/
 VERSION=${1:-}
 
-if [[ -z $VERSION ]]
-then
-    echo "No version supplied"
-    exit -1
+if [[ -z ${VERSION} ]]; then
+  echo "No version supplied"
+  exit 1
 fi
 
-curl -s "${BASEURL}?mode=json&include=all" | \
-    jq '.[] | select(.version == "go'${VERSION}'")' | \
-    jq -r '.files[] | select(.kind == "archive" and (.os == "linux" or .os == "darwin")) | (.os + "-" + .arch + " = \"" + .sha256 + "\";")'
+curl -s "${BASEURL}?mode=json&include=all" |
+  jq '.[] | select(.version == "go'"${VERSION}"'")' |
+  jq -r '.files[] | select(.kind == "archive" and (.os == "linux" or .os == "darwin")) | (.os + "-" + .arch + " = \"" + .sha256 + "\";")'