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Help:Extension:CodeMirror

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The CodeMirror extension provides syntax highlighting in wikitext editors. This can make editing easier by using colors and shading to visually separate plain text from links, templates, and other wikitext markup.

Usage[edit]

Enabling[edit]

CodeMirror can be enabled by setting "Enable syntax highlighting for wikitext" in your preferences. In WikiEditor (also known as the 2010 editor, enabled with the "Enable the editing toolbar" preference), it can also be toggled on and off using the highlighter button in the toolbar. In the 2017 editor, you can toggle CodeMirror by clicking the "Page options" button in the toolbar, then selecting "Syntax highlighting".

Keyboard shortcuts[edit]

These keyboard shortcuts do not apply to the 2017 editor, which has its own set of keyboard shortcuts. Those can be reviewed by pressing Ctrl+/ while the editor is open.
Shortcut Shortcut (macOS) Description
Alt+ Ctrl+ Move the cursor one word to the left.
Alt+ Ctrl+ Move the cursor one word to the right.
Alt+ Alt+ Move the selected lines up one line.
Alt+ Alt+ Move the selected lines down one line.
⇧ Shift+Alt+ ⇧ Shift+Alt+ Duplicate the selected lines and keep the selection on the top copy.
⇧ Shift+Alt+ ⇧ Shift+Alt+ Duplicate the selected lines and keep the selection on the bottom copy.
Escape Escape Reduce multiple selections to the main range, or to a cursor if there is only one selection.
Ctrl+↵ Enter ⌘ Command+↵ Enter Insert a blank line below the current line.
Ctrl+[ ⌘ Command+[ Remove indentation from the selected lines.
Ctrl+] ⌘ Command+] Add indentation to the selected lines.
Ctrl+⇧ Shift+[ ⌘ Command+Alt+[ Fold the currently selected templates.
Ctrl+⇧ Shift+] ⌘ Command+Alt+] Unfold the any folded templates in the selection.
Ctrl+Alt+[ Ctrl+Alt+[ Fold all templates on the page.
Ctrl+Alt+] Ctrl+Alt+] Unfold all templates that are currently folded.
Ctrl+f ⌘ Command+f Open the search panel.
Ctrl+g ⌘ Command+g Find the next occurrence of the search string.
⇧ Shift+Ctrl+g ⇧ Shift+⌘ Command+g Find the previous occurrence of the search string.
Ctrl+d ⌘ Command+d Select the next occurrence of the current selection or word, creating multiple selections.
Ctrl+click ⌘ Command+click Add an additional cursor or selection to the area clicked.
Ctrl+⇧ Shift+X ⌘ Command+⇧ Shift+X Toggle viewing the editor in right-to-left and left-to-right.

Features[edit]

These features are planned to be customizable on a per-user basis. See task T359498.

Bracket matching[edit]

Bracket matching

This feature highlights the innermost pair of brackets when the cursor lies between any bracket pair. When the cursor lies directly next to a bracket, the feature highlights the corresponding matching bracket.

Template folding[edit]

MediaWiki version:
1.43
This feature is not avaiable for the 2017 editor.
Template folding on w:Barack Obama.

Template folding is a form of code folding for templates in wikitext. It allows you to hide all parameters and their values, showing only the template name. This can make managing large, complex templates considerably easier.

Usage[edit]

When a cursor or selection covers any part of template syntax, a tooltip icon will appear just above the text. Clicking it will fold all parameters and values of the template, leaving only the template name.

Folded templates will have the template name followed by the ellipsis icon . Clicking on it will unfold the template back to its original state.

Keyboard shortcuts
Shortcut Shortcut (macOS) Description
Ctrl+⇧ Shift+[ ⌘ Command+Alt+[ Fold the currently selected templates.
Ctrl+⇧ Shift+] ⌘ Command+Alt+] Unfold the any folded templates in the selection.
Ctrl+Alt+[ Ctrl+Alt+[ Fold all templates on the page.
Ctrl+Alt+] Ctrl+Alt+] Unfold all templates that are currently folded.

Availability[edit]

Template folding is currently only deployed on specific wikis and for specific namespaces on Wikimedia wikis.[1] It will be available broadly to everyone as an opt-in feature after we offer preferences (task T359498).

Customization[edit]

If you'd like to keep the keyboard shortcut for folding templates, but hide the visual component, you can do so by adding the following to your personal CSS:[2]

.cm-tooltip-fold {
	display: none;
}

Line numbering[edit]

Note how the line numbering knew to account for the lines contained in the collapsed templates.

When enabled, line numbers are automatically displayed in all editors. On the Wikimedia wikis, it is only enabled for specific namespaces of specific wikis.[3]

It will be available broadly to everyone as an opt-in feature after we offer preferences (task T359498). Additionally, we'll have an option to highlight the active line, which is useful when editing code.

Line numbers will take into account any hidden lines, such as those through template folding.

Multiple cursors and selections[edit]

This feature is not avaiable for the 2017 editor.

You can add additional cursors or selections by holding the Ctrl key (or ⌘ Command on MacOS) and clicking on the desired content or cursor placement. After doing so, any changes you make will be applied to all the selections at the same time.

You can also press Ctrl+d (or ⌘ Command+d on MacOS) to select the next occurrence of the current selection or word, which create multiple selections. This can be useful as a quick find and replace feature.

Colorblind mode[edit]

For users who have difficulty distinguishing between colors, CodeMirror offers a colorblind-friendly mode. This feature can be activated on wikis with CodeMirror enabled with "Enable colorblind-friendly scheme for syntax highlighting when editing wikitext" in your preferences.

With the colorblind-friendly scheme active, the colors of the following page elements change:

Headings, symbols, signatures, section names, magic words #E4A400
Templates #9C3A00
HTML tags, references, mathematical expressions #56B4E9
Variables #009E73

In addition, background highlights and colors are removed from all text and objects. Bolding and underlining behavior remains unaffected.

Bidi isolation[edit]

This feature is currently a work-in-progress. See phab:T358804 for more information.

On right-to-left pages, CodeMirror can isolate HTML and other tags as bidirectional text, which can improve readability. The standard algorithm for the layout of text places neutral punctuation characters between right-to-left text on the wrong side. With bidi isolation, we can correct this so it reads more legibly:

CodeMirror without bidi isolation
CodeMirror with bidi isolation

Color and style customization[edit]

This is a partial list of the CodeMirror CSS classes. The complete list of default CodeMirror styling definitions is on Gerrit.

The colors and styles used in CodeMirror can be overridden by defining your own styles for the classes in the table below in your personal CSS.[2] Please be aware that changing some things like the line height or font size may not work in the 2017 wikitext editor.

CSS class(es) Element CodeMirror styling
.cm-mw-skipformatting leading space foo bar
.cm-mw-list asterisk or number sign * foo bar, # foo bar
.cm-mw-signature,
.cm-mw-hr
signature, horizontal rule ∼∼∼∼, ----
.cm-mw-indenting colons ::: foo bar
.cm-mw-html-entity HTML entities &
.cm-mw-comment HTML comment <!-- comment -->
.cm-mw-apostrophes-bold,
.cm-mw-apostrophes-italic
bold and italic '''bold''' ''italic''
Headings
.cm-mw-section-1 level 1 heading[4] = Heading =
.cm-mw-section-2 level 2 heading[4] == Heading ==
.cm-mw-section-3 level 3 heading === Heading ===
.cm-mw-section-4 level 4 heading ==== Heading ====
.cm-mw-section-5 level 5 heading ===== Heading =====
.cm-mw-section-6 level 6 heading ====== Heading ======
.cm-mw-section-header equal signs ==
Templates
example {{cite book|title=foo bar}}
.cm-mw-template other template content foo bar
.cm-mw-template-name template name cite book
.cm-mw-template-argument-name template parameters title=
.cm-mw-template-delimiter pipe |
.cm-mw-template-bracket opening/closing brackets {{ }}
.cm-mw-template-ground
.cm-mw-template2-ground
.cm-mw-template3-ground
whole template
(the number is the level of nesting)
{{foo|{{cite book|title=foo bar}}}}
Variables
example {{{foo|bar}}}
.cm-mw-templatevariable variable bar
.cm-mw-templatevariable-name triple-braced variable name foo
.cm-mw-templatevariable-bracket opening/closing brackets {{{ }}}
.cm-mw-templatevariable-delimiter pipe |
Parser functions
example {{#assessment: A | High }}
.cm-mw-parserfunction parser function parameters High
.cm-mw-parserfunction-name parser function name PAGENAME #invoke
.cm-mw-parserfunction-bracket opening/closing brackets {{ }}
.cm-mw-parserfunction-delimiter delimiter :
Extension tags
Note: Extension may use their own styles and rules for highlighting text within the extension tag.
example <poem style="padding: 1em;">string
whole line
string</poem>
.cm-mw-exttag text inside tags string
.cm-mw-exttag-name,
.cm-mw-ext-poem[5]
tag name poem
.cm-mw-exttag-bracket opening/closing brackets < >
.cm-mw-exttag-attribute reference attributes style="padding: 1em;"
HTML tags
example <span style="foo">foo bar</span>
.cm-mw-htmltag-name HTML tag span
.cm-mw-htmltag-bracket opening/closing brackets < >
.cm-mw-htmltag-attribute parameters and values style="foo"
superscript
subscript
foo<sup>bar</sup>
foo<sub>bar</sub>
Pre-formatted text
.cm-mw-tag-pre pre-formatted text <pre>foo bar</pre>
.cm-mw-tag-nowiki nowiki text <nowiki>foo bar</nowiki>
Internal links
example [[foo bar]] [[foo#section|bar]]
.cm-mw-link-pagename internal link target foo bar
.cm-mw-link # character #section
.cm-mw-link-tosection characters after the # #section
.cm-mw-link-bracket opening/closing brackets [[ ]]
.cm-mw-link-text link label (no additional formatting)
.cm-mw-link-delimiter pipe |
.cm-mw-pagename internal link targets foo bar
External links
example https://www.example.org
[https://www.example.org]
[https://www.example.org example.org]
.cm-mw-extlink,
.cm-mw-free-extlink
external link target www.example.org
.cm-mw-extlink-protocol,
.cm-mw-free-extlink-protocol
protocol https://
.cm-mw-extlink-text link label (no additional formatting)
.cm-mw-extlink-bracket opening/closing brackets [ ]
Tables
example {| class="wikitable"
|-
! Header text !! Header text
|-
| Example || Example
|}
.cm-mw-table-bracket opening/closing brackets and pipe {| |}
.cm-mw-table-delimiter row and column separators | |- !
.cm-mw-table-definition table classes and styles class="wikitable"
.cm-mw-table-caption caption text |+ caption
Other
.cm-mw-double-underscore magic words __TOC__
.cm-mw-list semicolon (definition lists) ;Foo:Bar
.cm-special-char-nbsp non-breaking space · ·
.cm-specialChar control characters


Notes[edit]

  1. Controlled by the $wgCodeMirrorTemplateFoldingNamespaces configuration setting. See Extension:CodeMirror#Configuration for more information.
  2. 2.0 2.1 Your personal CSS is at Special:MyPage/common.css. You can also make your changes take effect globally if GlobalCssJs is installed. On Wikimedia wikis, your global CSS is at meta:Special:MyPage/global.css.
  3. Controlled by the $wgCodeMirrorLineNumberingNamespaces configuration setting. See Extension:CodeMirror#Configuration for more information.
  4. 4.0 4.1 The size is not changed in the 2017 wikitext editor.
  5. Where "poem" is the name of the tag.