ci: test both push and pull_request events

I think we have a bug with pull_request events so...

action.yml

@@ -67,18 +67,56 @@ outputs:
 runs:
   using: 'composite'
   steps:
-    - name: Run
+    - name: Find PR (if it exists)
       id: pr-number
-      env:
-        BASE_BRANCH: ${{ inputs.base-branch }}
-        COMMENT: ${{ inputs.comment-on-pr }}
-        DO_COMPARISON: ${{ inputs.do-comparison }}
-        GENERATE_ARTIFACT: ${{ inputs.generate-artifact }}
-        JOB_NAME: ${{ inputs.job-name }}
+      if: inputs.comment-on-pr == 'true'
       run: |
-        "$GITHUB_ACTION_PATH/scripts/run.sh"
+        . "$GITHUB_ACTION_PATH/scripts/utils.sh"
+
+        # If we were triggered by a PR then this is easy
+        if [ "$GITHUB_EVENT_NAME" = "pull_request" ]; then
+                # shellcheck disable=SC2016
+                # expanded by the runner
+                pr_number='${{ github.event.number }}'
+                log "Triggered by a pull request with index: $pr_number"
+                log "Expected PR URL: $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/pulls/$pr_number"
+                log "Writing output to: $GITHUB_OUTPUT"
+                echo "pr-number=$pr_number" >> "$GIHUB_OUTPUT"
+                exit 0
+        fi
+
+        log 'Determine head_ref'
+        # For push & tag events it'll bet GITHUB_REF_NAME, for pull_request events it'll be GITHUB_HEAD_REF
+        head_ref=${GITHUB_REF_NAME:-$GITHUB_HEAD_REF}
+
+        log "Get PR number for $head_ref"
+        prs=$(curl -X 'GET' \
+                "$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/pulls?state=open&sort=recentupdate" \
+                -H "Authorization: token $GITHUB_TOKEN" \
+                -H 'Accept: application/json')
+
+        log "Open PRs: $(echo "$prs" | jq --compact output 'map(.number)')"
+
+        pr_number=$(echo "$prs" |
+                jq --arg head_ref "$head_ref" '.[] | select(.head.ref == $head_ref) | .number')
+
+        # This seems to create the file???
+        log "GITHUB_OUTPUT=$GITHUB_OUTPUT"
+        log "$(ls -l "$GITHUB_OUTPUT")"
+
+        # Protect against running before a PR is made or if it is triggered on the main branch
+        if [ -z "$pr_number" ]; then
+                warn "No PR created for this commit"
+                echo "pr-number=" >> "$GIHUB_OUTPUT"
+                exit 0
+        fi
+
+        log "Retrieved index: $pr_number"
+        log "Expected PR URL: $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/pulls/$pr_number"
+
+        echo "pr-number=$pr_number" >> "$GITHUB_OUTPUT"
     - name: Find previous comment (if present)
-      # We want to generate a comment and we we able to find the PR number
+      # We want to generate a comment, and we we able to fin the PR number
       if: inputs.comment-on-pr == 'true' && steps.pr-number.outputs.pr-number != ''
       id: find-comment
       uses: https://github.com/peter-evans/find-comment@3eae4d37986fb5a8592848f6a574fdf654e61f9e # v3
@@ -86,21 +124,35 @@ runs:
         issue-number: ${{ steps.pr-number.outputs.pr-number }}
         direction: first
         body-includes: "<!-- AUTOGENERATED by nix-flake-outputs-size action -->"
-    - name: Create report and comment on PR
-      # We want to generate a comment and we we able to find the PR number
-      if: inputs.comment-on-pr == 'true' && steps.pr-number.outputs.pr-number != ''
+    - name: Create report
+      if: inputs.comment-on-pr == 'true' || inputs.generate-artifact == 'true'
       env:
         PR_ID: ${{ steps.pr-number.outputs.pr-number }}
+        COMMENT: ${{ inputs.comment-on-pr }}
         COMMENT_ID: ${{ steps.find-comment.outputs.comment-id }}
+        ARTIFACT_NAME: ${{ inputs.artifact-name }}
         DO_COMPARISON: ${{ inputs.do-comparison }}
         BASE_BRANCH: ${{ inputs.base-branch }}
+        JOB_NAME: ${{ inputs.job-name }}
       run: |
         . "$GITHUB_ACTION_PATH/scripts/utils.sh"
 
+        # Input validation
+        if [ "$DO_COMPARISON" = 'true' ] && [ -z "$JOB_NAME" ]; then
+          error 'job-name should be set if you want to generate a comparison report'
+          exit 1
+        fi
+
+        # Create Size Report
+        "$GITHUB_ACTION_PATH/scripts/create-report.sh" report.json
+
+        # Nothing else to do
+        if [ "$COMMENT" != 'true' ]; then exit 0; fi
+
         # Try to do a comparison report
         if [ "$DO_COMPARISON" = 'true' ]; then
           if "$GITHUB_ACTION_PATH/scripts/retrieve-old-report.sh" && [ -f old-report.json ]; then
-            log "Reporting on sizes and comparing to sizes in $BASE_BRANCH"
+            log "Reporting on sizes and comparing to sizes in $HEAD_BRANCH"
 
             "$GITHUB_ACTION_PATH/scripts/comment_on_pr.sh" report.json old-report.json
             exit 0

scripts/run.sh

@@ -1,61 +0,0 @@
-#!/bin/sh
-
-. "$GITHUB_ACTION_PATH/scripts/utils.sh"
-
-# Input validation
-if [ "$COMMENT" != "true" ] && [ "$GENERATE_ARTIFACT" != "true" ]; then
-  panic 'Neither comment-on-pr nor generate-artifact is set
-    note: this looks like an error; if it isn'"'"'t disable this action with "step.if"'
-fi
-
-if [ "$DO_COMPARISON" = 'true' ] && [ -z "$JOB_NAME" ]; then
-  panic 'Requested a comparison report but job-name wasn'"'"'t set'
-fi
-
-# Create Size Report (will be uploaded by the upload-artifact action)
-"$GITHUB_ACTION_PATH/scripts/create-report.sh" report.json
-
-# Nothing else to do
-if [ "$COMMENT" != "true" ]; then exit 0; fi
-
-# Find the PR for this commit so we can post a comment on it
-pr_number=
-case "$GITHUB_EVENT_NAME" in
-"pull_request")
-  pr_number=$(jq .number "$GITHUB_EVENT_PATH")
-  log "Triggered by a pull request with index: $pr_number"
-  ;;
-"push")
-  log "Triggered by a push to $GITHUB_REF_NAME autodetecting PR number"
-
-  log "Get PR number for $GITHUB_REF_NAME"
-  prs=$(curl -X 'GET' \
-    "$GITHUB_API_URL/repos/$GITHUB_REPOSITORY/pulls?state=open&sort=recentupdate" \
-    -H "Authorization: token $GITHUB_TOKEN" \
-    -H 'Accept: application/json')
-
-  log "Found these open PRs: $(echo "$prs" | jq '[.[] | .number]')"
-
-  pr_number=$(echo "$prs" |
-    jq --arg ref "$GITHUB_REF_NAME" '.[] | select(.head.ref == $ref) | .number')
-
-  # Protect against running before a PR is made or if it is triggered on the main branch
-  if [ -z "$pr_number" ]; then
-    warn "No PR created for this commit"
-    exit 0
-  fi
-
-  log "The PR we found for $GITHUB_REF_NAME is $pr_number"
-  ;;
-*)
-  panic "Unexpected event $GITHUB_EVENT_NAME for commenting on a PR, expected push or pull_request"
-  ;;
-esac
-
-log "Expected PR URL: $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/pulls/$pr_number"
-
-# This seems to create the file???
-log "GITHUB_OUTPUT=$GITHUB_OUTPUT"
-log "$(ls -l "$GITHUB_OUTPUT")"
-
-echo "pr-number=$pr_number" >>"$GITHUB_OUTPUT"

scripts/utils.sh

@@ -12,11 +12,6 @@ error() {
   log "\e[0;31m[WARN]:" "$@" "\e[0m"
 }
 
-panic() {
-  error "$@"
-  exit 1
-}
-
 group() {
   echo "::group::$1"
 }