How to generate an input cell?

For example I have a block of code

Module[{}, a=1;b=2;...]

I want to have a function called gencode, so when I run gencode, it will generate an input cell which contains this block of code just like I type them by hand.

How to write this gencode?

Answer

CellPrint plus ExpressionCell are tools for generating cells. They do not hold their arguments, so some control of evaluation is necessary (Defer). [Update: In response to Szabolcs' comment, may as well let options be passed.]

ClearAll[gencode];
SetAttributes[gencode, HoldAll];
gencode[code_, opts : OptionsPattern[Cell]] := 
 CellPrint@ExpressionCell[Defer@code, "Input", opts];

Examples:

Mathematica graphics

Or following Szabolcs:

gencode[Module[{a, b}, a = 1; b = 2; a + b], GeneratedCell -> False]

Comments

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