ADD Variables for the command interpreters

CHANGES_NEXT_RELEASE

@@ -0,0 +1 @@
+- Add variables for the intepreter (#10).

lib/command-node.js

@@ -38,10 +38,20 @@ var readline = require('readline'),
         'stressCommit': {
             parameters: ['delay', 'times', 'threads', 'initTime'],
             description: '\tExecutes the recorded batch as many times as requested, with delay (ms) ' +
-                                'between commands. \n' +
-                         '\tThe "threads" parameter indicates how many agents will repeat that same sequence. ' +
-                                'The "initTime" (ms)\n' +
-                         '\tparameter indicates the mean of the random initial waiting times for each agent.',
+            'between commands. \n' +
+            '\tThe "threads" parameter indicates how many agents will repeat that same sequence. ' +
+            'The "initTime" (ms)\n' +
+            '\tparameter indicates the mean of the random initial waiting times for each agent.',
+            handler: function() {}
+        },
+        'set': {
+            parameters: ['name', 'value'],
+            description: '\tSets a new variable or update the contents of an existing one.',
+            handler: function() {}
+        },
+        'vars': {
+            parameters: [],
+            description: '\tList all the variables currently set.',
             handler: function() {}
         },
         'exit': {
@@ -50,6 +60,7 @@ var readline = require('readline'),
             handler: function() {}
         }
     },
+    variables = {},
     rl;
 
 /**
@@ -196,6 +207,33 @@ function doExit() {
         toExit = true;
     }
 }
+
+function executeSet(commands) {
+    variables[commands[1]] = commands[2];
+}
+
+function executeVars() {
+    writer.log('Variable list:\n');
+
+    for (var i in variables) {
+        if (variables.hasOwnProperty(i)) {
+            writer.log('- %s=%s\n', i, variables[i]);
+        }
+    }
+}
+
+function applyVariables(command) {
+    for (var i in command) {
+        for (var j in variables) {
+            if (variables.hasOwnProperty(j)) {
+                command[i] = command[i].replace('@' + j, variables[j]);
+            }
+        }
+    }
+
+    return command;
+}
+
 /**
  * Executes the given command (the list of words parsed from the command line input) in the context of the commands
  * describe by the object Commands.
@@ -208,14 +246,18 @@ function executeCommander(command, commands) {
         showHelp(commands);
     } else if (command[0] === 'exit') {
         doExit();
+    } else if (command[0] === 'set') {
+        executeSet(command);
+    } else if (command[0] === 'vars') {
+        executeVars();
     } else if (command[0] === 'stressInit') {
         stressInit();
     } else if (command[0] === 'stressCommit') {
-        stressCommit(command, commands);
+        stressCommit(applyVariables(command), commands);
     } else if (stressTest) {
-        stressAdd(command);
+        stressAdd(applyVariables(command));
     } else if (commands[command[0]]) {
-        execute(command, commands);
+        execute(applyVariables(command), commands);
     } else if (command[0] === '') {
         writer.log('\n');
     } else {
@@ -278,6 +320,7 @@ function initialize(commands, promptString) {
             prompt();
         }
     });
+
     if (process.argv.length === 3) {
         var lines = fs.readFileSync(process.argv[2], 'utf8').split('\n');
 

test/unit/command-node_test.js

@@ -57,9 +57,11 @@ describe('Command-line tool', function() {
     var writer = new StringWriter();
 
     beforeEach(function() {
-        commandNode.initialize(commands, 'Test>', process.stdin, process.stdout);
+        commandNode.initialize(commands, 'Test>');
         commandNode.setWriter(writer);
-        commands.create.handler = function() {};
+        commands.create.handler = function(command) {
+            commandNode.getWriter().log('Creating %s with %s', command[0], command[1]);
+        };
     });
 
     afterEach(function() {
@@ -161,4 +163,24 @@ describe('Command-line tool', function() {
             }, 800);
         });
     });
+    describe('When two variables are set and the variable list is listed', function() {
+        it('should show both variables with their values', function(done) {
+            process.stdin.push('set testVar1 18\n');
+            process.stdin.push('set testVar2 6324\n');
+            writer.reset();
+            process.stdin.push('vars\n');
+            writer.get().should.match(/testVar1=18[.\s\S]*testVar2=6324/);
+            done();
+        });
+    });
+    describe('When a command is executed with a variable name "@testVar1"', function() {
+        it('should replace the variable names with their values', function(done) {
+            process.stdin.push('set testVar1 18\n');
+            process.stdin.push('set testVar2 6324\n');
+            writer.reset();
+            process.stdin.push('create @testVar1 @testVar2\n');
+            writer.get().should.match(/Creating.*18.*6324/);
+            done();
+        });
+    });
 });