1 files changed, 38 insertions, 0 deletions
diff --git a/js/node_readline.js b/js/node_readline.js
new file mode 100644
index 0000000..bfd1982
--- /dev/null
+++ b/js/node_readline.js
@@ -0,0 +1,38 @@
+// IMPORTANT: choose one
+var RL_LIB = "libreadline";  // NOTE: libreadline is GPL
+//var RL_LIB = "libedit";
+
+var HISTORY_FILE = require('path').join(process.env.HOME, '.mal-history');
+
+var rlwrap = {}; // namespace for this module in web context
+
+var ffi = require('ffi'),
+    fs = require('fs');
+
+var rllib = ffi.Library(RL_LIB, {
+    'readline':    [ 'string', [ 'string' ] ],
+    'add_history': [ 'int',    [ 'string' ] ]});
+
+var rl_history_loaded = false;
+
+exports.readline = rlwrap.readline = function(prompt) {
+    prompt = prompt || "user> ";
+
+    if (!rl_history_loaded) {
+        rl_history_loaded = true;
+        var lines = fs.readFileSync(HISTORY_FILE).toString().split("\n");
+        // Max of 2000 lines
+        lines = lines.slice(Math.max(lines.length - 2000, 0));
+        for (var i=0; i<lines.length; i++) {
+            if (lines[i]) { rllib.add_history(lines[i]); }
+        }
+    }
+
+    var line = rllib.readline(prompt);
+    if (line) {
+        rllib.add_history(line);
+        fs.appendFileSync(HISTORY_FILE, line + "\n");
+    }
+
+    return line;
+}