Get pkgname from pkgbuild

Author: j-waters

README.md

@@ -6,7 +6,7 @@ GitHub Actions to publish AUR package.
 
 ### `pkgname`
 
-**Required** AUR package name.
+**Optional** AUR package name. If not specified the name will be extracted from the PKGBUILD file.
 
 ### `pkgbuild`
 

action.yml

@@ -6,8 +6,8 @@ branding:
   icon: package
 inputs:
   pkgname:
-    description: 'AUR package name'
-    required: true
+    description: 'AUR package name, extracted from PKGBUILD if not specified'
+    required: false
   pkgbuild:
     description: 'Path to PKGBUILD file'
     required: true

build.sh

@@ -23,7 +23,6 @@ assert_non_empty() {
   fi
 }
 
-assert_non_empty inputs.pkgname "$pkgname"
 assert_non_empty inputs.pkgbuild "$pkgbuild"
 assert_non_empty inputs.commit_username "$commit_username"
 assert_non_empty inputs.commit_email "$commit_email"
@@ -53,6 +52,25 @@ git config --global user.name "$commit_username"
 git config --global user.email "$commit_email"
 echo '::endgroup::'
 
+echo '::group::Getting pkgname'
+if [[ -z "$pkgname" ]]; then
+  echo 'Extracting pkgname from PKGBUILD'
+  
+  mkdir -p /tmp/makepkg
+  cp "$pkgbuild" /tmp/makepkg/PKGBUILD
+  info=$(cd /tmp/makepkg; makepkg --printsrcinfo)
+
+  pattern='pkgname = ([a-z0-9@._+-]*)'
+  [[ "$info" =~ $pattern ]]
+
+  pkgname="${BASH_REMATCH[1]}"
+  echo "Got pkgname '$pkgname'"
+else
+  echo "Using pkgname '$pkgname' from argument"
+  assert_non_empty inputs.pkgname "$pkgname"
+fi
+echo '::endgroup::'
+
 echo '::group::Cloning AUR package into /tmp/local-repo'
 git clone -v "https://aur.archlinux.org/${pkgname}.git" /tmp/local-repo
 echo '::endgroup::'