Add Indent / Outdent Functionality to Google Spreadsheets

0-README.md

This tutorial demonstrates how to add an "Indent Text" menu item to a Google spreadsheet so you can indent/outdent text.

• When the "Indent Text" menu item is selected, any cells within a single column selection will be indented by 5 spaces.

• You can increase or decrease the number of spaces the text is indented by changing the line below so that the "5" is changed to a larger or smaller number (depending on your preference):

newValues.push(['=CONCAT(REPT( CHAR( 160 ), 5),"' + values[i][0] + '")']);

• This code works on multiple cells so you can select an entire column and indent in bulk.

1-config.md

1. Open your spreadsheet and select menu item "Tools" --> "Script Editor"

2. Once the script editor opens, copy and paste the code into the "Code.gs" file, beneath the code that's already included.

3. Go to menu "File" --> "Save"

4. Return to your spreadsheet and reload the browser. You may get a pop-up asking you to grant access to your new script - approve it. Once granted access, you should now see a new menu item called "Indent Text" to the right of the "Help" menu. Yay!

2-indent-outdent-functions.js

var ss = SpreadsheetApp.getActiveSpreadsheet();

function moveText(direction) {
  var values = ss.getActiveRange().getValues();
  var cols = ss.getActiveRange().getNumColumns();
  var rows = ss.getActiveRange().getNumRows();

  var newValues = new Array();

  for (x = 1; x <= rows; x++) {
    for (y = 1; y <= cols; y++) {
      var cell = ss.getActiveRange().getCell(x, y);
      var value = cell.getValue();
      var formula = (direction == ">>>") ? '=CONCAT(REPT( CHAR( 160 ), 5),"' + value + '")'
      : '=IF(TRIM(LEFT("' + value + '", 5))=CONCAT(REPT( CHAR( 160 ), 5),""), MID("' + value + '", 6, LEN("' + value + '")), TRIM("' + value + '"))';
      
      if (value != '') {
        cell.setFormula([formula]);
        cell.setValue(cell.getValue());
      } else {
        cell.setValue(['']);
      }
    }
  }
};

function indentText() {
  moveText(">>>");
};

function flushLeft() {
  moveText("<<<");

};

function onOpen() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet();

  var entries = [{
    name : ">>>",
    functionName : "indentText"
  },{
    name : "<<<",
    functionName : "flushLeft"

  }];
  sheet.addMenu("Indent Text", entries);
};

This works really nice. Thanks to all.
Is there a way to get it to modify the format but not the content of the cell? (similar to the " @" custom formating)