Fix error when git log returns an empty string

And add a bunch of debug instructions

.eslintrc.json

@@ -0,0 +1,9 @@
+{
+    "env": {
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "rules": {
+        "no-console": 0
+    }
+}

README.md

@@ -26,7 +26,7 @@ This are for instance the release notes generated from `joyent/node` running
 
     git-release-notes v0.9.8..v0.9.9 html > changelog.html
 
-<a href="https://github.com/ariatemplates/git-release-notes/raw/master/templates/node.png" target="_blank"><img src="https://github.com/ariatemplates/git-release-notes/raw/master/templates/node_thumb.png" alt="Node's release notes"></a>
+[<img src="https://github.com/ariatemplates/git-release-notes/raw/master/templates/node_thumb.png" alt="Node's release notes">](https://github.com/ariatemplates/git-release-notes/raw/master/templates/node.png)
 
 #### Custom template
 
@@ -68,7 +68,9 @@ For instance, [Aria Templates](https://github.com/ariatemplates/ariatemplates) h
 
 In this case using
 
-    git-release-notes -t "^([a-z]+) #(\d+) (.*)$" -m type -m issue -m title v1.3.6..HEAD html
+```
+git-release-notes -t "^([a-z]+) #(\d+) (.*)$" -m type -m issue -m title v1.3.6..HEAD html
+```
 
 generates the additional fields on the commit object
 
@@ -79,4 +81,13 @@ generates the additional fields on the commit object
 
 Another project using similar conventions is [AngularJs](https://github.com/angular/angular.js), [commit message conventions](https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit#).
 
-    git-release-notes -t "^(\w*)(?:\(([\w\$\.]*)\))?\: (.*)$" -m type -m scope -m title v1.1.2..v1.1.3 markdown
+```
+git-release-notes -t "^(\w*)(?:\(([\w\$\.]*)\))?\: (.*)$" -m type -m scope -m title v1.1.2..v1.1.3 markdown
+```
+
+
+### Debug
+
+If the output is not what you expect run
+
+`DEBUG=release-notes:* git-release-notes ...`

index.js

@@ -39,9 +39,12 @@ var git = require("./lib/git");
 var fs = require("fs");
 var ejs = require("ejs");
 var path = require("path");
+var debug = require("debug")("release-notes:cli");
 
 var template = argv._[1];
+debug("Trying to locate template '%s'", template);
 if (!fs.existsSync(template)) {
+	debug("Template file '%s' doesn't exist, maybe it's template name", template);
 	// Template name?
 	if (template.match(/[a-z]+(\.ejs)?/)) {
 		template = path.resolve(__dirname, "./templates/" + path.basename(template, ".ejs") + ".ejs");
@@ -51,31 +54,41 @@ if (!fs.existsSync(template)) {
 		process.exit(1);
 	}
 }
+debug("Trying to read template '%s'", template);
 fs.readFile(template, function (err, templateContent) {
 	if (err) {
 		require("optimist").showHelp();
 		console.error("\nUnable to locate template file " + argv._[1]);
 		process.exit(5);
 	} else {
 		getOptions(function (options) {
+			debug("Running git log in '%s' on branch '%s' with range '%s'", options.p, options.b, argv._[0]);
 			git.log({
 				branch : options.b,
 				range : argv._[0],
 				title : new RegExp(options.t),
 				meaning : Array.isArray(options.m) ? options.m : [options.m],
 				cwd : options.p
 			}, function (commits) {
-				var output = ejs.render(templateContent.toString(), {
-					commits : commits
-				});
-				process.stdout.write(output + "\n");
+				debug("Got %d commits", commits.length);
+				if (commits.length) {
+					debug("Rendering template");
+					var output = ejs.render(templateContent.toString(), {
+						commits : commits
+					});
+					process.stdout.write(output + "\n");
+				} else {
+					console.error('No commits in the specified range');
+					process.exit(6);
+				}
 			});
 		});
 	}
 });
 
 function getOptions (callback) {
 	if (argv.f) {
+		debug("Trying to read configuration file '%s'", argv.f);
 		fs.readFile(argv.f, function (err, data) {
 			if (err) {
 				console.error("Unable to read configuration file\n" + err.message);
@@ -100,4 +113,4 @@ function getOptions (callback) {
 	} else {
 		callback(argv);
 	}
-}
+}

lib/git.js

@@ -1,6 +1,10 @@
+var debug = require("debug")("release-notes:git");
+var parser = require("debug")("release-notes:parser");
+
 exports.log = function (options, callback) {
 	var spawn = require("child_process").spawn;
 	var gitArgs = ["log", "--no-color", "--no-merges", "--branches=" + options.branch, "--format=" + formatOptions, options.range];
+	debug("Spawning git with args %o", gitArgs);
 	var gitLog = spawn("git", gitArgs, {
 		cwd : options.cwd,
 		stdio : ["ignore", "pipe", process.stderr]
@@ -12,10 +16,17 @@ exports.log = function (options, callback) {
 	});
 
 	gitLog.on("exit", function (code) {
+		debug("Git command exited with code '%d'", code);
 		if (code === 0) {
-			// Build the list of commits from git log
-			var commits = processCommits(allCommits.replace(/\r\n?|[\n\u2028\u2029]/g, "\n").replace(/^\uFEFF/, ''), options);
-			callback(commits);
+			allCommits = normalizeNewlines(allCommits).trim();
+
+			if (allCommits) {
+				// Build the list of commits from git log
+				var commits = processCommits(allCommits, options);
+				callback(commits);
+			} else {
+				callback([]);
+			}
 		}
 	});
 };
@@ -32,8 +43,11 @@ function processCommits (commitMessages, options) {
 	var stream = commitMessages.split("\n");
 	var commits = [];
 	var workingCommit;
+	parser("Iterating on %d lines", stream.length);
 	stream.forEach(function (rawLine) {
+		parser("Raw line\n\t%s", rawLine);
 		var line = parseLine(rawLine);
+		parser("Parsed line %o", line);
 		if (line.type === "new") {
 			workingCommit = {
 				messageLines : []
@@ -43,6 +57,7 @@ function processCommits (commitMessages, options) {
 			workingCommit.messageLines.push(line.message);
 		} else if (line.type === "title") {
 			var title = parseTitle(line.message, options);
+			parser("Parsed title %o", title);
 			for (var prop in title) {
 				workingCommit[prop] = title[prop];
 			}
@@ -82,6 +97,7 @@ function parseLine (line) {
 function parseTitle (title, options) {
 	var expression = options.title;
 	var names = options.meaning;
+	parser("Parsing title '%s' with regular expression '%s' and meanings %o", title, expression, names);
 
 	var match = title.match(expression);
 	if (!match) {
@@ -97,4 +113,8 @@ function parseTitle (title, options) {
 		}
 		return builtObject;
 	}
-}
+}
+
+function normalizeNewlines(message) {
+	return message.replace(/\r\n?|[\n\u2028\u2029]/g, "\n").replace(/^\uFEFF/, '');
+}

package.json

@@ -9,8 +9,13 @@
     "compare",
     "version"
   ],
+  "scripts": {
+    "lint": "eslint index.js lib",
+    "posttest": "npm run lint"
+  },
   "version": "0.0.3",
   "dependencies": {
+    "debug": "^2.6.0",
     "ejs": "^2.5.5",
     "optimist": "^0.6.1"
   },
@@ -25,5 +30,8 @@
     "url": "https://github.com/ariatemplates/git-release-notes"
   },
   "homepage": "https://github.com/ariatemplates/git-release-notes",
-  "preferGlobal": true
+  "preferGlobal": true,
+  "devDependencies": {
+    "eslint": "^3.14.0"
+  }
 }