utils: new script, extract-changelog.md for releases

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

.github/workflows/release.yml

@@ -104,11 +104,7 @@ jobs:
 
       - name: Extract ChangeLog entry ...
         run: |
-          awk '/^-----*$/{if (x == 1) exit; x=1;next}x' doc/ChangeLog.md \
-              |head -n -1 > release.md
-          echo "" >> release.md
-          echo "> [!TIP]" >> release.md
-          echo "> **Try Infix in GNS3!** Download the appliance from the [GNS3 Marketplace](https://gns3.com/marketplace/appliances/infix) to test Infix in a virtual network environment without hardware." >> release.md
+          cat doc/ChangeLog.md | ./utils/extract-changelog.sh > release.md
           cat release.md
 
       - uses: ncipollo/release-action@v1

utils/extract-changelog.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+#
+# Extract the latest release entry from ChangeLog.md and unwrap lines
+# for GitHub's web view (lets the browser handle line wrapping).
+#
+# Usage: cat doc/ChangeLog.md | extract-changelog.sh > release.md
+#
+# Output goes to stdout.
+#
+
+set -e -o pipefail
+
+# Extract section between first two --- lines, skip trailing blank lines
+head -n -1 < <(awk '/^-----*$/{if (x == 1) exit; x=1;next}x') |
+
+# Unwrap lines for GitHub's web view (browser does wrapping)
+# Preserves: blank lines, list items, headings, blockquotes, indented blocks
+# Joins: soft-wrapped paragraph/list continuations
+awk '
+{
+    if (/^$/) {
+        if (buf) print buf
+        buf = ""
+        print
+        blank = 1
+        next
+    }
+    if (/^  / && buf) {
+        # Indented continuation - strip indent and join
+        sub(/^  /, " ")
+        buf = buf $0
+    } else if (/^[-*>#\[|]/ || /^[0-9]+\./ || blank || !buf || brk) {
+        # New block: special char, after blank, first line, or after md break
+        if (buf) print buf
+        buf = $0
+    } else {
+        # Paragraph continuation - join with space
+        buf = buf " " $0
+    }
+    blank = 0
+    brk = /  $/
+}
+END { if (buf) print buf }
+'
+
+# Append tip for GNS3
+cat <<EOF
+
+> [!TIP]
+> **Try Infix in GNS3!** Download the appliance from the [GNS3 Marketplace](https://gns3.com/marketplace/appliances/infix) to test Infix in a virtual network environment without hardware.
+EOF