C# script for use in Tabular Editor 3/2.13+ to format all DAX expressions in a Tabular model (including Power BI Desktop).

Format All DAX v1.cs

/*

Formatting of calculated tables and calculated columns is unsupported in Power BI Desktop as at 25 Aug 2021
and will be ignored if unsupported features are not enabled in Tabular Editor

*/

// Begin Options

var useShortFormat = true;
var insertSpaceAfterFunctionName = false;
var insertLineBreakOnFirstLine = true;

// End Options

foreach (var m in Model.AllMeasures) { FormatDax(m); }
foreach (var i in Model.AllCalculationItems) { FormatDax(i); }
foreach (var t in Model.Tables.OfType<CalculatedTable>().Where(x => !x.Name.Contains("DateTableTemplate_") && !x.Name.Contains("LocalDateTable_"))) { FormatDax(t); }
foreach (var c in Model.AllColumns.OfType<CalculatedColumn>().Where(x => !x.DaxTableName.Contains("DateTableTemplate_") && !x.DaxTableName.Contains("LocalDateTable_"))) { FormatDax(c); }

CallDaxFormatter(shortFormat: useShortFormat, skipSpaceAfterFunctionName: !insertSpaceAfterFunctionName);

if (insertLineBreakOnFirstLine)
{

    foreach (var m in Model.AllMeasures) { m.Expression = "\r\n" + m.Expression; }
    foreach (var i in Model.AllCalculationItems) { i.Expression = "\r\n" + i.Expression; }
    foreach (var t in Model.Tables.OfType<CalculatedTable>().Where(x => !x.Name.Contains("DateTableTemplate_") && !x.Name.Contains("LocalDateTable_"))) { t.Expression = "\r\n" + t.Expression; }
    foreach (var c in Model.AllColumns.OfType<CalculatedColumn>().Where(x => !x.DaxTableName.Contains("DateTableTemplate_") && !x.DaxTableName.Contains("LocalDateTable_"))) { c.Expression = "\r\n" + c.Expression; }

}

Info("Script finished.");