docs: fix bump-release

- Restore "Unreleased" section in CHANGELOG.
- Try to inform the user what the mandatory argument represents.

Author: commonquail

bump-release

@@ -10,19 +10,23 @@ bump()
     sed -i '/^version /c version = "'"$v"'"' Cargo.toml
     sed -i "/^:version: /c :version: $v" doc/*.adoc
     cargo build
-    git add --patch
 }
 
 main()
 {
-    local v="$1"
+    local v="${1:?specify version}"
 
     sed -i 's/Unreleased/'"$v - $(date --iso-8601=date)"'/' CHANGELOG.md
     bump "$v"
+    git add --patch
     git commit --message "commitmsgfmt $v"
     git tag --annotate "v$v" --message "commitmsgfmt $v"
 
     bump "$v-GIT"
+    local f=$(mktemp)
+    awk '/^## / && !done { print "## Unreleased\n" ; done=1 } 1' CHANGELOG.md > $f
+    mv $f CHANGELOG.md
+    git add --patch
     git commit --message "Start next cycle"
 }