From aedf90a0a5d66274e47c07e4bd407d3937e2fba1 Mon Sep 17 00:00:00 2001
From: Koen Rouwhorst <info@koenrouwhorst.nl>
Date: Tue, 13 Jul 2021 18:21:01 +0200
Subject: [PATCH] Reduce preview PR comment size

---
 Dockerfile                   | 4 +---
 README.md                    | 2 +-
 bin/filter-preview-output.sh | 9 +++++++++
 entrypoint.sh                | 5 +++++
 4 files changed, 16 insertions(+), 4 deletions(-)
 create mode 100755 bin/filter-preview-output.sh

diff --git a/Dockerfile b/Dockerfile
index da56af8..49ab65a 100644
--- a/Dockerfile
+++ b/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"]
diff --git a/README.md b/README.md
index 9359fa3..4163290 100644
--- a/README.md
+++ b/README.md
@@ -105,7 +105,7 @@ GitHub Action.
   with:
     msg: |
       ```
-      ${{ steps.dnscontrol_preview.outputs.output }}
+      ${{ steps.dnscontrol_preview.outputs.preview_comment }}
       ```
     check_for_duplicate_msg: true
 ```
diff --git a/bin/filter-preview-output.sh b/bin/filter-preview-output.sh
new file mode 100755
index 0000000..d7aa360
--- /dev/null
+++ b/bin/filter-preview-output.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# source: https://git.io/J86QD
+grep -v -e '^\.\.\.0 corrections$' |\
+  grep -v -e '^0 corrections' |\
+  grep -v -e '\.\.\. (skipping)' |\
+  grep -v -e '^----- DNS Provider: ' |\
+  grep -v -e '^----- Registrar: ' |\
+  grep -v -e '^----- Getting nameservers from:'
diff --git a/entrypoint.sh b/entrypoint.sh
index f79062d..730c272 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -30,5 +30,10 @@ 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)"
+
 echo "::set-output name=output::$OUTPUT"
+echo "::set-output name=preview_comment::$FILTERED_OUTPUT"
+
 exit $EXIT_CODE