Update changelog 2

README.md

@@ -208,7 +208,9 @@ To generate a changelog we decided to use [github-changelog-generator](https://g
 
 To install tool you need Ruby's `gem` package manager.
 
-    $ gem install github_changelog_generator
+    $ gem --user install github_changelog_generator
+
+And put `$HOME/.gem/ruby/*/bin/` into your PATH.
 
 Generating changelog file first time:
 
@@ -218,7 +220,12 @@ Appending next releases could be done adding `--base` flag:
 
     $ github_changelog_generator -u CosmWasm -p cw-plus --base CHANGELOG.md
 
-If you hit GitHub's 50 requests/hour limit, please follow [this](https://github.com/github-changelog-generator/github-changelog-generator#github-token) guide to create a token key which you can pass using `--token` flag.
+If you hit GitHub's 50 requests/hour limit, please follow [this](https://github.com/github-changelog-generator/github-changelog-generator#github-token)
+guide to create a token key which you can pass using `--token` flag.
+
+There's also a convenience `scripts/update_changelog.sh`, which can take a
+--since-tag parameter (to avoid processing the entire history). It can also
+auto-detect the latest version tag for you, with --latest-tag.
 
 ## Licenses
 

scripts/update_changelog.sh

@@ -1,3 +1,40 @@
 #!/bin/bash
 
-github_changelog_generator -u CosmWasm -p cw-plus --base CHANGELOG.md
+
+ORIGINAL_OPTS=$*
+OPTS=$(getopt -l "help,since-tag:,latest-tag,token:" -o "hlt" -- "$@") || exit 1
+
+eval set -- "$OPTS"
+while true
+do
+case $1 in
+  -h|--help)
+    echo -e "Usage: $0 [-h|--help] [--since-tag <tag>] [-l|--latest-tag] [-t|--token <token>]
+-h, --help          Display help
+--since-tag <tag>   Process changes since tag <tag>
+-l, --latest-tag    Process changes since latest tag
+--token <token>     Pass changelog github token <token>"
+    exit 0
+    ;;
+--since-tag)
+    shift
+    TAG="$1"
+    ;;
+-l|--latest-tag)
+    TAG=$(git tag --sort=creatordate | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+' | tail -1)
+    ORIGINAL_OPTS=$(echo "$ORIGINAL_OPTS" | sed "s/\\B$1\\b/--since-tag $TAG/")
+    ;;
+--)
+    shift
+    break
+    ;;
+esac
+shift
+done
+
+cp CHANGELOG.md /tmp/CHANGELOG.md.$$
+sed -i -n "/^## \\[$TAG\\]/,\$p" CHANGELOG.md
+
+github_changelog_generator -u CosmWasm -p cw-plus --base CHANGELOG.md $ORIGINAL_OPTS || cp /tmp/CHANGELOG.md.$$ CHANGELOG.md
+
+rm -f /tmp/CHANGELOG.md.$$