skip doc PRs in changelog helper

scripts/prepare_changelog.sh

@@ -1,14 +1,33 @@
 #!/bin/zsh
 
-
 LAST_RELEASE=$1
+DO_PR_CHECK=1
+
+set -o pipefail
+
+is_doc_pr(){
+    if ! (($+commands[jq])); then
+        DO_PR_CHECK=0
+        echo "jq not found"
+        return 1
+    fi
+    PR_NUM=$1
+    out=$(curl -fsS "https://api.github.com/repos/hashicorp/packer/issues/${PR_NUM}" | jq '[.labels[].name == "docs"] | any')
+    exy="$?"
+    if [ $exy -ne 0 ]; then
+        echo "bad response from github"
+        exit $exy
+    fi
+    grep -q true <<< $out
+    return $?
+}
 
 if [ -z $LAST_RELEASE ]; then
     echo "you need to give the previous release version. prepare_changelog.sh v<version>"
     exit 1
 fi
 
-
+get_prs(){
     # git log --merges v0.10.2...c3861d167533fb797b0fae0c380806625712e5f7 |
     git log --merges HEAD...${LAST_RELEASE} |
     grep -o "Merge pull request #\(\d\+\)" | awk -F\# '{print $2}' | while read line
@@ -17,11 +36,29 @@ do
         if [ $? -ne 0 ]; then
             echo $line
         fi
-done | while read line
+    done | while read PR_NUM
     do
-    echo "https://github.com/hashicorp/packer/pull/${line}"
-    #TODO get tags. ignore docs
+        if (($DO_PR_CHECK)) && is_doc_pr $PR_NUM; then
+            continue
+        fi
+        echo "https://github.com/hashicorp/packer/pull/${PR_NUM}"
+    done
+}
+
+#is_doc_pr 52061111
+# is_doc_pr 5206 # non-doc pr
+#is_doc_pr 5434 # doc pr
+#echo $?
+#exit
+
+# prpid=$!
+# trap 'kill -9 ${prpid}; exit' INT TERM
+
+get_prs | while read line; do
     echo $line
+    if [[ "$line" =~ "bad" ]]; then
+        exit 1
+    fi
     vared -ch ok
 done