Editing Code folding (section)

==Software with code folding capability==
One of the earliest folding editors was [[STET (text editor)|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).

A folding editor appeared in the [[Occam programming language|occam]] [[Integrated development environment|IDE]] ''circa'' 1983, which was called the [[Inmos Transputer Development System (TDS)]]<ref>{{Cite book|title=Transputer research and applications, 2 : NATUG-2, proceedings of the Second Conference of the North American Transputer Users Group, October 18-19, 1989, Durham, NC|last=North American Transputer Users Group. Conference (2nd : 1989 : Durham, N.C.)|date=1990|publisher=IOS Press|others=Board, John A., Duke University.|isbn=9051990278|location=Amsterdam|pages=85|oclc=35478471}}</ref><sup>,</sup>.<ref>{{Cite web|url=http://www.transputer.net/tn/03/tn03.pdf|title=INMOS Technical Note 03 - Getting started with the TDS|last=Cormie|first=David|date=1986|website=transputer.net|access-date=2019-07-19}}</ref> The "f" editor (in list below) probably is the most intact legacy from this work.

The [[Apple Macintosh|Macintosh]] computer historically had a number of [[source code editor]]s that "folded" portions of code via "[[progressive disclosure|disclosure]] triangles".  The [[UserLand Software]] product Frontier is a scripting environment that has this capability.<ref>{{cite web|accessdate=2006-12-27|url=http://www.outliners.com/|title=Outliners.com|url-status=dead|archiveurl=https://web.archive.org/web/20061223230643/http://www.outliners.com/|archivedate=2006-12-23}}</ref><!-- This site doesn't actually verify this citation? -->

Folding is provided by many modern text editors, and [[#Conventions|syntax-based]] or semantics-based folding is now a component of many [[Integrated development environment|software development environments]]. Editors include:

<!-- (Please insert in alphabetical order) -->
{| class="wikitable sortable" style="text-align: center; width: auto; table-layout: fixed;"
|-
! style="width: 12em" | Name
! Token
! Indentation
! Syntax
! User
|-
| [[ABAP#ABAP_Workbench|ABAP Editor]]
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
| AkelPad
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
| [[Anjuta|Anjuta IDE]]
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
| [[Atom (text editor)|Atom]]{{efn|http://flight-manual.atom.io/using-atom/sections/folding/}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
|-
| [[BBEdit]]
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{dunno}}
|-
| [[Brackets (text editor)|Brackets]]
| {{yes2}}Plug-in
| {{yes}}
| {{yes}}
| {{no}}
|-
| [[Codeanywhere]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
| [[Codenvy]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
| [[Code::Blocks|Code::Blocks IDE]]
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
|-
| [[Cubic IDE]]
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
|-
| CudaText
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}

|-
| [[Delphi (IDE)|Delphi IDE]]
| {{Yes}}
| {{dunno}}
| {{Yes}}
| {{dunno}}
|-
| [[Adobe Dreamweaver|Dreamweaver]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
|-
| [[Eclipse (software)|Eclipse]]
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
| EditPlus
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
|-
| [[Emacs]]
| {{yes}}{{efn|Token-based folding is implemented by the [http://www.emacswiki.org/emacs/FoldingMode ''folding'' minor mode]. One can also use ''[https://www.gnu.org/software/emacs/manual/html_node/emacs/Outline-Mode.html outline]'' and ''[http://www.emacswiki.org/emacs/AllOut allout]'' minor modes for sectioning program sources.}}
| {{dunno}}{{efn|One can use the <code>set-selective-display</code> function in Emacs to hide lines based on the indentation level, as suggested in the [http://www.emacswiki.org/emacs/HideShow#toc4 Universal code folding] note.}}
| {{yes}}{{efn|1=Syntax-dependent folding is supported by the ''[https://www.gnu.org/software/emacs/manual/html_node/emacs/Outline-Mode.html outline]'' and ''[http://www.emacswiki.org/emacs/AllOut allout]'' modes
for special dedicated [[Outline (list)|outline]]-syntaxes; by the ''[http://www.emacswiki.org/emacs/HideShow#toc3 hideshow]'' minor mode for some programming languages; also, by the ''[http://www.emacswiki.org/emacs/semantic-tag-folding.el semantic-tag-folding]'' minor mode and the <code>[http://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/cedet/semantic/senator.el?h=cedet-branch#n484 senator-fold-tag]</code> command for [http://cedet.sourceforge.net/semantic.shtml syntaxes supported by ''semantic'' (a component of CEDET)], as well as by ''[http://www.emacswiki.org/emacs/DocMode doc-mode]'' for [[JavaDoc]] or [[Doxygen]] comments, by ''[https://www.gnu.org/software/auctex/manual/auctex/Folding.html#Folding TeX-fold-mode]'', <code>[http://www.lysator.liu.se/~lenst/about_psgml/psgml.html#Fold sgml-fold-element]</code> command, 
''[http://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/nxml/nxml-outln.el?h=EMACS_23_1_RC#n23 nxml-outln]'' library in the corresponding language-specific modes, and possibly in other modes for particular syntaxes. Sometimes, the standard simple ''outline'' minor mode is used to simulate syntax-based folding, cf. the [http://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/emacs-lisp/lisp-mode.el#n226 use] of it in properly indented Emacs Lisp source code, the [http://c2.com/cgi/wiki?EmacsOutlineMode use of it (see near the end of the page)] for properly indented HTML.  Several folding mechanisms are unified by the ''[http://www.emacswiki.org/emacs/FoldDwim fold-dwim]'' interface.  See also [http://www.emacswiki.org/emacs/CategoryHideStuff CategoryHideStuff].}}
| {{yes}}{{efn|Folding of user-selected regions in Emacs is implemented by the <code>[http://www.emacswiki.org/emacs/HideRegion hide-region-hide]</code> command.}}

|-
| [[EmEditor|EmEditor Professional]]
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}

|-
| FlashDevelop IDE
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}

|-
| [[geany]]
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}

|-
| [[gedit]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}

|-
| [[ISPF#ISPF Editor|ISPF]]
| {{dunno}}
| {{Yes}}
| {{dunno}}
| {{Yes}}

|-
| [[JED (text editor)|JED]]
| {{yes}}
| {{yes}}{{efn|The <code>set_selective_display</code> function may be used to hide lines indented beyond a specified amount.}}
| {{dunno}}
| {{no}}

|-
| [[jEdit]]
| {{yes}}
| {{yes}} 
| {{yes}}
| {{yes}}

|-
| [[Kate (text editor)|Kate]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
| [[MATLAB]]
| {{no}}
| {{no}}
| {{yes}}
| {{no}}

|-
| [[Microsoft Visual Studio|MS Visual Studio]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
| [[NetBeans|NetBeans IDE]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
| [[Notepad++]]
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
| [[PHPEd|NuSphere PHPEd]]
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{Yes}}

|-
| [[Qt Creator]]
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{dunno}}

|-
| [[SciTE]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}

|-
| [[STET (text editor)|STET]]{{efn|STET may have been the first text editor that supported folding{{Citation needed|date=January 2008}}}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}

|-
| [[TextMate]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
| [[UltraEdit]]
| {{no}}
| {{no}}
| {{yes}}
| {{Yes}}

|-
| [[Vim (text editor)|Vim]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
| [[Visual Expert]]
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}

|-
| [[Visual Studio Code]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}

|-
| [[Xcode]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}

|-
| [[Zend Studio]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|}


===Other editors===
{{div col|colwidth=22em}}
* aoeui, the [[Dvorak Simplified Keyboard|Dvorak]]-optimized editor
* Author-it enterprise authoring and component content management software
* f (alias xf, Winf, Winf32)
* Folding Text Editor
* [[GFA BASIC]]
* GridinSoft Notepad
* [[IntelliJ IDEA]] (and other [[JetBrains]] IDEs)
* [[Keynote (notetaking software)|Keynote]]
* [[Komodo Edit]]
* [[Kwrite]]
* [[Leo (text editor)|Leo]]
* [[LEXX_(text_editor)|LEXX/LPEX]] (editor for the [[OED]])<ref>LEXX &ndash; A programmable structured editor ''IBM Journal of Research and Development'', Vol 31, No. 1, 1987, IBM Reprint order number G322-0151</ref>
* [[MonoDevelop]]
* [[NoteTab|NoteTab Pro]]
* [[Padre (software)|Padre]]
* RJ Text Editor
* [[Smultron]]
* [[The Hessling Editor]]
* [[Visual Studio]]
* [[WinShell]] (since version 3.30)
* [[XEDIT]] (however its folding is effected by scripts)
* Zeus
{{div col end}}