Merge pull request #57 from koenrh/filter-preview-output

Reduce preview PR comment size

Dockerfile

@@ -10,7 +10,5 @@ LABEL "com.github.actions.color"="yellow"
 
 RUN apk add --no-cache bash
 
-COPY README.md /
-
-COPY entrypoint.sh /entrypoint.sh
+COPY README.md entrypoint.sh bin/filter-preview-output.sh /
 ENTRYPOINT ["/entrypoint.sh"]

README.md

@@ -105,7 +105,7 @@ GitHub Action.
   with:
     msg: |
       ```
-      ${{ steps.dnscontrol_preview.outputs.output }}
+      ${{ steps.dnscontrol_preview.outputs.preview_comment }}
       ```
     check_for_duplicate_msg: true
 ```

bin/filter-preview-output.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# source: https://git.io/J86QD
+grep -v -e '^\.\.\.0 corrections$' |\
+  grep -v -e '^0 corrections' |\
+  grep -v -e '\.\.\. (skipping)' |\
+  grep -v -e '^----- DNS Provider: ' |\
+  grep -v -e '^----- Registrar: ' |\
+  grep -v -e '^----- Getting nameservers from:'

entrypoint.sh

@@ -2,6 +2,17 @@
 
 set -o pipefail
 
+escape() {
+  local input="$1"
+
+  # https://github.community/t/set-output-truncates-multiline-strings/16852/3
+  input="${input//'%'/'%25'}"
+  input="${input//$'\n'/'%0A'}"
+  input="${input//$'\r'/'%0D'}"
+
+  echo "$input"
+}
+
 # Resolve to full paths
 CONFIG_ABS_PATH="$(readlink -f "${INPUT_CONFIG_FILE}")"
 CREDS_ABS_PATH="$(readlink -f "${INPUT_CREDS_FILE}")"
@@ -25,10 +36,13 @@ EXIT_CODE="$?"
 
 echo "$OUTPUT"
 
-# https://github.community/t/set-output-truncates-multiline-strings/16852/3
-OUTPUT="${OUTPUT//'%'/'%25'}"
-OUTPUT="${OUTPUT//$'\n'/'%0A'}"
-OUTPUT="${OUTPUT//$'\r'/'%0D'}"
+# Filter output to reduce 'preview' PR comment length
+FILTERED_OUTPUT="$(echo "$OUTPUT" | /filter-preview-output.sh)"
+
+OUTPUT="$(escape "$OUTPUT")"
+FILTERED_OUTPUT="$(escape "$FILTERED_OUTPUT")"
 
 echo "::set-output name=output::$OUTPUT"
+echo "::set-output name=preview_comment::$FILTERED_OUTPUT"
+
 exit $EXIT_CODE