From b58698b257fb6552e053cd245d63a140d3f7a478 Mon Sep 17 00:00:00 2001
From: Joel Martin <github@martintribe.org>
Date: Sun, 27 Apr 2014 16:55:31 -0500
Subject: JS: add localStorage history load/save. Slurp using sync XHR.

---
 js/core.js        | 13 ++++++++++++-
 js/jq_readline.js | 18 ++++++++++++++++++
 mal.html          |  3 +++
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/js/core.js b/js/core.js
index b5a52e0..3ab2117 100644
--- a/js/core.js
+++ b/js/core.js
@@ -39,7 +39,18 @@ function println() {
 }
 
 function slurp(f) {
-    return require('fs').readFileSync(f, 'utf-8');
+    if (typeof require !== 'undefined') {
+        return require('fs').readFileSync(f, 'utf-8');
+    } else {
+        var req = new XMLHttpRequest();
+        req.open("GET", f, false);
+        req.send();
+        if (req.status == 200) {
+            return req.responseText;
+        } else {
+            throw new Error("Failed to slurp file: " + f);
+        }
+    }
 }
 
 
diff --git a/js/jq_readline.js b/js/jq_readline.js
index e9f624f..51bb571 100644
--- a/js/jq_readline.js
+++ b/js/jq_readline.js
@@ -1,3 +1,21 @@
+var max_history_length = 1000;
+
+function jq_load_history(jq) {
+    if (localStorage['mal_history']) {
+        var lines = JSON.parse(localStorage['mal_history']);
+        if (lines.length > max_history_length) {
+            lines = lines.slice(lines.length-max_history_length);
+        }
+        jq.SetHistory(lines);
+    }
+}
+
+function jq_save_history(jq) {
+    var lines = jq.GetHistory();
+    localStorage['mal_history'] = JSON.stringify(lines);
+}
+
+
 var readline = {
     'readline': function(prompt_str) {
             return prompt(prompt_str);
diff --git a/mal.html b/mal.html
index 3bc5b21..89d9c41 100644
--- a/mal.html
+++ b/mal.html
@@ -208,6 +208,8 @@ this software.
 
       rep("(println (str \"Mal [\" *host-language* \"]\"))");
 
+      jq_load_history(jqconsole);
+
       // Abort prompt on Ctrl+C.
       jqconsole.RegisterShortcut('C', function() {
         jqconsole.AbortPrompt();
@@ -240,6 +242,7 @@ this software.
               jqconsole.Write(exc + '\n', 'jqconsole-error');
             }
           }
+          jq_save_history(jqconsole);
         }
         jqconsole.Prompt(true, handler);
         /*
-- 
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