Better version management

README.md

@@ -139,11 +139,20 @@ the textual mode and see if the output is valid SVG.
 
 ## Development
 
+Development happens mostly on the `develop` branch, which is released on MELPA at every commit. The `master` branch is used to generate tags which are then released to [MELPA
+stable](https://stable.melpa.org).
+
 In order to contribute to `plantuml-mode` make sure to:
 
 - agree with the [GPLv3+ licencing terms](#License) as they are mandated by Emacs
 - install [`cask`](https://github.com/cask/cask)
 - always test your code and run the full test suite with `cask exec ert-runner` (or just by `make`)
+- ensure you always target `develop` in your pull requests
+
+For collaborators who have merge access to the repo:
+- make sure [`set-version.sh`](./blob/develop/bin/set-version.sh) is run as part of your [`pre-commit` git hooks](https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks)
+- always merge PRs on the command line
+- when releasing a new stable version, add the proper entry in the changelog within `plantuml-mode.el` to ensure the right version is set for `plantuml-mode-version`
 
 # Credits
 

bin/set-version.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# Retrieves the version from the changelog in plantuml-mode.el
+function grab_version(){
+    grep ';; version' plantuml-mode.el | \
+        head -n1 |                       \
+        cut -f3 -d' ' |                  \
+        tr -d ','
+}
+
+# Updates the version in-place
+function update_version(){
+    NEW_VERSION="${1}"
+    sed -i -E "s/plantuml-mode-version \"[1-9\.]+\"/plantuml-mode-version \"${1}\"/" plantuml-mode.el
+}
+
+case "$(git rev-parse --abbrev-ref HEAD)" in
+    'master')
+        VERSION="$(grab_version)"
+        update_version "${VERSION}"
+        git add plantuml-mode.el
+    ;;
+
+    'develop')
+        VERSION="$(date '+%Y%m%d.%H%M')" # MELPA style
+        update_version "${VERSION}"
+        git add plantuml-mode.el
+    ;;
+
+    *)
+        ## do nothing
+    ;;
+esac

plantuml-mode.el

@@ -92,7 +92,7 @@
 
 (defvar plantuml-mode-hook nil "Standard hook for plantuml-mode.")
 
-(defconst plantuml-mode-version "1.3.1" "The plantuml-mode version string.")
+(defconst plantuml-mode-version "20190821.1053" "The plantuml-mode version string.")
 
 (defvar plantuml-mode-debug-enabled nil)