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Add customizable indentation and unindent #24

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merged 1 commit into from
Dec 19, 2016
Merged

Add customizable indentation and unindent #24

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38 changes: 28 additions & 10 deletions src/codeflask.js
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
function CodeFlask() {

function CodeFlask(indent) {
this.indent = indent || " ";
}

CodeFlask.prototype.run = function(selector, opts) {
Expand Down Expand Up @@ -93,7 +93,9 @@ CodeFlask.prototype.handleInput = function(textarea, highlightCode, highlightPre
input,
selStartPos,
inputVal,
roundedScroll;
roundedScroll,
currentLineStart,
indentLength;

textarea.addEventListener('input', function(e) {
input = this;
Expand All @@ -107,13 +109,29 @@ CodeFlask.prototype.handleInput = function(textarea, highlightCode, highlightPre
input = this,
selStartPos = input.selectionStart,
inputVal = input.value;

// If TAB pressed, insert four spaces
if(e.keyCode === 9){
input.value = inputVal.substring(0, selStartPos) + " " + inputVal.substring(selStartPos, input.value.length);
input.selectionStart = selStartPos + 4;
input.selectionEnd = selStartPos + 4;
e.preventDefault();
currentLineStart = selStartPos - input.value.substr(0, selStartPos).split("\n").pop().length;

// If tab pressed, indent
if (e.keyCode === 9) {
e.preventDefault();

// Allow shift-tab
if (e.shiftKey) {
indentLength = self.indent.length;

// If the current line begins with the indent, unindent
if (inputVal.substring(currentLineStart, currentLineStart + indentLength) == self.indent) {
input.value = inputVal.substring(0, currentLineStart) +
inputVal.substring(currentLineStart + indentLength, input.value.length);
input.selectionStart = selStartPos - self.indent.length;
input.selectionEnd = selStartPos - self.indent.length;
}
} else {
input.value = inputVal.substring(0, selStartPos) + self.indent +
inputVal.substring(selStartPos, input.value.length);
input.selectionStart = selStartPos + self.indent.length;
input.selectionEnd = selStartPos + self.indent.length;
}

highlightCode.innerHTML = input.value.replace(/&/g, "&")
.replace(/</g, "&lt;")
Expand Down