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. The list in the text is shown folded (above) and unfolded (below).]] A folding editor is a Text Editor which supports text folding or Code Folding , a mechanism allowing the user to hide and reveal blocks of text—usually named. Typically this is done to allow the user to better picture the overall structure of a document or program. Folding is provided by many modern text editors, and Syntax-based or semantics-based folding is now a component of many Software Development Environments . HISTORY The first folding editor was probably ''STET'', an editor written for the VM/CMS operating system in 1977 by Mike Cowlishaw . STET is a text editor (for documentation, programs, etc.) which folds files on the basis of blocks of lines; any block of lines can be folded and replaced by a name line (which in turn can be part of a block which itself can then be folded). Folding editors appeared in the original Occam IDE at around 1983 , called Inmos Transputer Development System . The Macintosh computer historically had a number of Source Code Editor s that "folded" portions of code via " Disclosure triangles". The UserLand Software product Frontier is a scripting environment that has this capability.1 EDITORS WITH FOLDING CAPABILITY Many text editors provide folding capability. Among them are:
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