add comments

auto-changelog.sh

@@ -1,14 +1,22 @@
 #! /bin/bash
+# update tags
 git fetch --tags
-URL="https://github.com/MetaMask/metamask-extension/pull/"
+# get origin
+ORIGIN=$(git config --get remote.origin.url)
+URL=$(echo $ORIGIN | sed -E 's/(.*).git{1}(.*)/\1/')
+# get git logs from last tag until HEAD, pretty by 'subject::body' filteres by grep for PR made with Github squash merge or Github regular merge
 LOG=$(git log $(git describe --tags $(git rev-list --tags --max-count=1))..HEAD --pretty="%s::%b" --reverse --grep="Merge pull request #" --grep="(#");
 while read -r line; do
+    # get git log subject
     SUBJECT="$(echo $line | sed -E 's/(.*):{2}(.*)/\1/')"
+    # get git log PR id, PR made with Github squash merge or Github regular merge
     PR=$(echo $SUBJECT | sed 's/^.*(#\([^&]*\)).*/\1/' | sed 's/^.*#\([^&]*\) from.*/\1/')
+    # if PR made with Github squah merge, subject is the body
     if [ -z "$(echo $line | sed -E 's/(.*):{2}(.*)/\2/')" ]; then
-        MESSAGE=$(echo $SUBJECT | sed "s/(#$PR)//g"); else
-        MESSAGE=$(echo $line | sed -E  's/(.*):{2}(.*)/\2/') 
+        BODY=$(echo $SUBJECT | sed "s/(#$PR)//g"); else
+        BODY=$(echo $line | sed -E 's/(.*):{2}(.*)/\2/') 
     fi
-    sed -i "/## Current Develop Branch/a - [#$PR]($URL$PR): $MESSAGE" CHANGELOG.md;
+    # add entry to CHANGELOG
+    sed -i "/## Current Develop Branch/a - [#$PR]($URL/pull/$PR): $BODY" CHANGELOG.md;
 done <<< "$LOG"
 echo "CHANGELOG updated"