[PATCH 2/2] Improve check-whitespace output

["Chris. Webster via GitGitGadget" <gitgitgadget@gmail.com>]

From: "Chris. Webster" <chris@webstech.net>

A message in the step log will refer to the Summary output.

The job summary output now has links to the commits and files.

Signed-off-by: Chris. Webster <chris@webstech.net>
---
 .github/workflows/check-whitespace.yml | 34 +++++++++++++++++++-------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/.github/workflows/check-whitespace.yml b/.github/workflows/check-whitespace.yml
index 3a99073bc33..da557fd5914 100644
--- a/.github/workflows/check-whitespace.yml
+++ b/.github/workflows/check-whitespace.yml
@@ -20,46 +20,62 @@ jobs:
     - name: git log --check
       id: check_out
       run: |
+        baseSha=${{github.event.pull_request.base.sha}}
         problems=()
         commit=
         commitText=
-        lastcommit=
+        commitTextmd=
+        goodparent=
         while read dash sha etc
         do
           case "${dash}" in
           "---")
             if test -z "${commit}"
             then
-              lastcommit=${sha}
+              goodparent=${sha}
             fi
             commit="${sha}"
             commitText="${sha} ${etc}"
+            commitTextmd="[${sha}](https://github.com/${{ github.repository }}/commit/${sha}) ${etc}"
             ;;
           "")
             ;;
           *)
             if test -n "${commit}"
             then
-              problems+=("" "--- ${commitText}")
+              problems+=("1) --- ${commitTextmd}")
               echo ""
               echo "--- ${commitText}"
               commit=
             fi
-            problems+=("${dash} ${sha} ${etc}")
-            echo "${problems[-1]}"
+            case "${dash}" in
+            *:[1-9]*:) # contains file and line number information
+              dashend=${dash#*:}
+              problems+=("[${dash}](https://github.com/${{ github.repository }}/blob/${{github.event.pull_request.head.ref}}/${dash%%:*}#L${dashend%:}) ${sha} ${etc}")
+              ;;
+            *)
+              problems+=("\`${dash} ${sha} ${etc}\`")
+              ;;
+            esac
+            echo "${dash} ${sha} ${etc}"
             ;;
           esac
-        done <<< $(git log --check --pretty=format:"---% h% s" ${{github.event.pull_request.base.sha}}..)
+        done <<< $(git log --check --pretty=format:"---% h% s" ${baseSha}..)
 
         if test ${#problems[*]} -gt 0
         then
           if test -z "${commit}"
           then
-            lastcommit=${{github.event.pull_request.base.sha}}
+            goodparent=${baseSha: 0:7}
           fi
-          echo "A whitespace issue was found in one or more of the commits." >$GITHUB_STEP_SUMMARY
+          echo "🛑 Please review the Summary output for further information."
+          echo "### :x: A whitespace issue was found in one or more of the commits." >$GITHUB_STEP_SUMMARY
           echo "" >>$GITHUB_STEP_SUMMARY
-          echo "Run \`git rebase --whitespace=fix ${lastcommit}\` and \`git push --force\` to correct the problem." >>$GITHUB_STEP_SUMMARY
+          echo "Run these commands to correct the problem:" >>$GITHUB_STEP_SUMMARY
+          echo "1. \`git rebase --whitespace=fix ${goodparent}\`" >>$GITHUB_STEP_SUMMARY
+          echo "1. \`git push --force\`" >>$GITHUB_STEP_SUMMARY
+          echo " " >>$GITHUB_STEP_SUMMARY
+          echo "Errors:" >>$GITHUB_STEP_SUMMARY
           for i in "${problems[@]}"
           do
             echo "${i}" >>$GITHUB_STEP_SUMMARY
-- 
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