return version even if not using git sources

Downloading the source tarball from GitHub lacks .git structure and the version will be blank.  This fixes it by using the directory name which contains the version.

scripts/version

@@ -2,12 +2,17 @@
 set -eu
 
 cd "$(dirname "$0")/../"
-test -d .git || exit 1
 
-if git describe --tags --match 'jq-*' >/dev/null 2>&1; then
- git describe --tags --match 'jq-*' --dirty | sed 's/^jq-//'
+if test -d .git; then
+ if git describe --tags --match 'jq-*' >/dev/null 2>&1; then
+ git describe --tags --match 'jq-*' --dirty | sed 's/^jq-//'
+ else
+ branch=$(git rev-parse --abbrev-ref HEAD)
+ commit=$(git describe --always --dirty)
+ echo "${branch}-${commit}"
+ fi
+elif [[ "$(basename $(pwd))" =~ ^jq-jq-([0-9]+\.[0-9]+(\.[0-9]+)?)$ ]]; then
+ echo ${BASH_REMATCH[1]}
 else
- branch=$(git rev-parse --abbrev-ref HEAD)
- commit=$(git describe --always --dirty)
- echo "${branch}-${commit}"
+ exit 1
 fi