packager

app/node_modules/chainsaw/examples/prompt.js

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+var Chainsaw = require('chainsaw');
+var Lazy = require('lazy');
+
+module.exports = Prompt;
+function Prompt (stream) {
+    var waiting = [];
+    var lines = [];
+    var lazy = Lazy(stream).lines.map(String)
+        .forEach(function (line) {
+            if (waiting.length) {
+                var w = waiting.shift();
+                w(line);
+            }
+            else lines.push(line);
+        })
+    ;
+    
+    var vars = {};
+    return Chainsaw(function (saw) {
+        this.getline = function (f) {
+            var g = function (line) {
+                saw.nest(f, line, vars);
+            };
+            
+            if (lines.length) g(lines.shift());
+            else waiting.push(g);
+        };
+        
+        this.do = function (cb) {
+            saw.nest(cb, vars);
+        };
+    });
+}
+
+var util = require('util');
+if (__filename === process.argv[1]) {
+    var stdin = process.openStdin();
+    Prompt(stdin)
+        .do(function () {
+            util.print('x = ');
+        })
+        .getline(function (line, vars) {
+            vars.x = parseInt(line, 10);
+        })
+        .do(function () {
+            util.print('y = ');
+        })
+        .getline(function (line, vars) {
+            vars.y = parseInt(line, 10);
+        })
+        .do(function (vars) {
+            if (vars.x + vars.y < 10) {
+                util.print('z = ');
+                this.getline(function (line) {
+                    vars.z = parseInt(line, 10);
+                })
+            }
+            else {
+                vars.z = 0;
+            }
+        })
+        .do(function (vars) {
+            console.log('x + y + z = ' + (vars.x + vars.y + vars.z));
+            process.exit();
+        })
+    ;
+}