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markdown-mode.el
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;;; markdown-mode.el --- Major mode for Markdown-formatted text -*- lexical-binding: t; -*-
;; Copyright (C) 2007-2023 Jason R. Blevins and markdown-mode
;; contributors (see the commit log for details).
;; Author: Jason R. Blevins <jblevins@xbeta.org>
;; Maintainer: Jason R. Blevins <jblevins@xbeta.org>
;; Created: May 24, 2007
;; Version: 2.8-alpha
;; Package-Requires: ((emacs "28.1"))
;; Keywords: Markdown, GitHub Flavored Markdown, itex
;; URL: https://jblevins.org/projects/markdown-mode/
;; This file is not part of GNU Emacs.
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; See the README.md file for details.
;;; Code:
(require 'easymenu)
(require 'outline)
(require 'thingatpt)
(require 'cl-lib)
(require 'url-parse)
(require 'button)
(require 'color)
(require 'rx)
(require 'subr-x)
(defvar jit-lock-start)
(defvar jit-lock-end)
(defvar flyspell-generic-check-word-predicate)
(defvar electric-pair-pairs)
(defvar sh-ancestor-alist)
(declare-function project-roots "project")
(declare-function sh-set-shell "sh-script")
(declare-function mailcap-file-name-to-mime-type "mailcap")
(declare-function dnd-get-local-file-name "dnd")
;; for older emacs<29
(declare-function mailcap-mime-type-to-extension "mailcap")
(declare-function file-name-with-extension "files")
(declare-function yank-media-handler "yank-media")
;;; Constants =================================================================
(defconst markdown-mode-version "2.8-alpha"
"Markdown mode version number.")
(defconst markdown-output-buffer-name "*markdown-output*"
"Name of temporary buffer for markdown command output.")
;;; Global Variables ==========================================================
(defvar markdown-reference-label-history nil
"History of used reference labels.")
(defvar markdown-live-preview-mode nil
"Sentinel variable for command `markdown-live-preview-mode'.")
(defvar markdown-gfm-language-history nil
"History list of languages used in the current buffer in GFM code blocks.")
(defvar markdown-follow-link-functions nil
"Functions used to follow a link.
Each function is called with one argument, the link's URL. It
should return non-nil if it followed the link, or nil if not.
Functions are called in order until one of them returns non-nil;
otherwise the default link-following function is used.")
;;; Customizable Variables ====================================================
(defvar markdown-mode-hook nil
"Hook run when entering Markdown mode.")
(defvar markdown-before-export-hook nil
"Hook run before running Markdown to export XHTML output.
The hook may modify the buffer, which will be restored to it's
original state after exporting is complete.")
(defvar markdown-after-export-hook nil
"Hook run after XHTML output has been saved.
Any changes to the output buffer made by this hook will be saved.")
(defgroup markdown nil
"Major mode for editing text files in Markdown format."
:prefix "markdown-"
:group 'text
:link '(url-link "https://jblevins.org/projects/markdown-mode/"))
(defcustom markdown-command (let ((command (cl-loop for cmd in '("markdown" "pandoc" "markdown_py")
when (executable-find cmd)
return (file-name-nondirectory it))))
(or command "markdown"))
"Command to run markdown."
:group 'markdown
:type '(choice (string :tag "Shell command") (repeat (string)) function))
(defcustom markdown-command-needs-filename nil
"Set to non-nil if `markdown-command' does not accept input from stdin.
Instead, it will be passed a filename as the final command line
option. As a result, you will only be able to run Markdown from
buffers which are visiting a file."
:group 'markdown
:type 'boolean)
(defcustom markdown-open-command nil
"Command used for opening Markdown files directly.
For example, a standalone Markdown previewer. This command will
be called with a single argument: the filename of the current
buffer. It can also be a function, which will be called without
arguments."
:group 'markdown
:type '(choice file function (const :tag "None" nil)))
(defcustom markdown-open-image-command nil
"Command used for opening image files directly.
This is used at `markdown-follow-link-at-point'."
:group 'markdown
:type '(choice file function (const :tag "None" nil)))
(defcustom markdown-hr-strings
'("-------------------------------------------------------------------------------"
"* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *"
"---------------------------------------"
"* * * * * * * * * * * * * * * * * * * *"
"---------"
"* * * * *")
"Strings to use when inserting horizontal rules.
The first string in the list will be the default when inserting a
horizontal rule. Strings should be listed in decreasing order of
prominence (as in headings from level one to six) for use with
promotion and demotion functions."
:group 'markdown
:type '(repeat string))
(defcustom markdown-bold-underscore nil
"Use two underscores when inserting bold text instead of two asterisks."
:group 'markdown
:type 'boolean)
(defcustom markdown-italic-underscore nil
"Use underscores when inserting italic text instead of asterisks."
:group 'markdown
:type 'boolean)
(defcustom markdown-marginalize-headers nil
"When non-nil, put opening atx header markup in a left margin.
This setting goes well with `markdown-asymmetric-header'. But
sadly it conflicts with `linum-mode' since they both use the
same margin."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-marginalize-headers-margin-width 6
"Character width of margin used for marginalized headers.
The default value is based on there being six heading levels
defined by Markdown and HTML. Increasing this produces extra
whitespace on the left. Decreasing it may be preferred when
fewer than six nested heading levels are used."
:group 'markdown
:type 'integer
:safe 'natnump
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-asymmetric-header nil
"Determines if atx header style will be asymmetric.
Set to a non-nil value to use asymmetric header styling, placing
header markup only at the beginning of the line. By default,
balanced markup will be inserted at the beginning and end of the
line around the header title."
:group 'markdown
:type 'boolean)
(defcustom markdown-indent-function 'markdown-indent-line
"Function to use to indent."
:group 'markdown
:type 'function)
(defcustom markdown-indent-on-enter t
"Determines indentation behavior when pressing \\[newline].
Possible settings are nil, t, and \\='indent-and-new-item.
When non-nil, pressing \\[newline] will call `newline-and-indent'
to indent the following line according to the context using
`markdown-indent-function'. In this case, note that
\\[electric-newline-and-maybe-indent] can still be used to insert
a newline without indentation.
When set to \\='indent-and-new-item and the point is in a list item
when \\[newline] is pressed, the list will be continued on the next
line, where a new item will be inserted.
When set to nil, simply call `newline' as usual. In this case,
you can still indent lines using \\[markdown-cycle] and continue
lists with \\[markdown-insert-list-item].
Note that this assumes the variable `electric-indent-mode' is
non-nil (enabled). When it is *disabled*, the behavior of
\\[newline] and `\\[electric-newline-and-maybe-indent]' are
reversed."
:group 'markdown
:type '(choice (const :tag "Don't automatically indent" nil)
(const :tag "Automatically indent" t)
(const :tag "Automatically indent and insert new list items" indent-and-new-item)))
(defcustom markdown-enable-wiki-links nil
"Syntax highlighting for wiki links.
Set this to a non-nil value to turn on wiki link support by default.
Support can be toggled later using the `markdown-toggle-wiki-links'
function or \\[markdown-toggle-wiki-links]."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.2"))
(defcustom markdown-wiki-link-alias-first t
"When non-nil, treat aliased wiki links like [[alias text|PageName]].
Otherwise, they will be treated as [[PageName|alias text]]."
:group 'markdown
:type 'boolean
:safe 'booleanp)
(defcustom markdown-wiki-link-search-subdirectories nil
"When non-nil, search for wiki link targets in subdirectories.
This is the default search behavior for GitHub and is
automatically set to t in `gfm-mode'."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.2"))
(defcustom markdown-wiki-link-search-parent-directories nil
"When non-nil, search for wiki link targets in parent directories.
This is the default search behavior of Ikiwiki."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.2"))
(defcustom markdown-wiki-link-search-type nil
"Searching type for markdown wiki link.
sub-directories: search for wiki link targets in sub directories
parent-directories: search for wiki link targets in parent directories
project: search for wiki link targets under project root"
:group 'markdown
:type '(set
(const :tag "search wiki link from subdirectories" sub-directories)
(const :tag "search wiki link from parent directories" parent-directories)
(const :tag "search wiki link under project root" project))
:package-version '(markdown-mode . "2.5"))
(make-obsolete-variable 'markdown-wiki-link-search-subdirectories 'markdown-wiki-link-search-type "2.5")
(make-obsolete-variable 'markdown-wiki-link-search-parent-directories 'markdown-wiki-link-search-type "2.5")
(defcustom markdown-wiki-link-fontify-missing nil
"When non-nil, change wiki link face according to existence of target files.
This is expensive because it requires checking for the file each time the buffer
changes or the user switches windows. It is disabled by default because it may
cause lag when typing on slower machines."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.2"))
(defcustom markdown-wiki-link-retain-case nil
"When non-nil, wiki link file names do not have their case changed."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.7"))
(defcustom markdown-uri-types
'("acap" "cid" "data" "dav" "fax" "file" "ftp"
"geo" "gopher" "http" "https" "imap" "ldap" "mailto"
"mid" "message" "modem" "news" "nfs" "nntp"
"pop" "prospero" "rtsp" "service" "sip" "tel"
"telnet" "tip" "urn" "vemmi" "wais")
"Link types for syntax highlighting of URIs."
:group 'markdown
:type '(repeat (string :tag "URI scheme")))
(defcustom markdown-url-compose-char
'(?∞ ?… ?⋯ ?# ?★ ?⚓)
"Placeholder character for hidden URLs.
This may be a single character or a list of characters. In case
of a list, the first one that satisfies `char-displayable-p' will
be used."
:type '(choice
(character :tag "Single URL replacement character")
(repeat :tag "List of possible URL replacement characters"
character))
:package-version '(markdown-mode . "2.3"))
(defcustom markdown-blockquote-display-char
'("▌" "┃" ">")
"String to display when hiding blockquote markup.
This may be a single string or a list of string. In case of a
list, the first one that satisfies `char-displayable-p' will be
used."
:type '(choice
(string :tag "Single blockquote display string")
(repeat :tag "List of possible blockquote display strings" string))
:package-version '(markdown-mode . "2.3"))
(defcustom markdown-hr-display-char
'(?─ ?━ ?-)
"Character for hiding horizontal rule markup.
This may be a single character or a list of characters. In case
of a list, the first one that satisfies `char-displayable-p' will
be used."
:group 'markdown
:type '(choice
(character :tag "Single HR display character")
(repeat :tag "List of possible HR display characters" character))
:package-version '(markdown-mode . "2.3"))
(defcustom markdown-definition-display-char
'(?⁘ ?⁙ ?≡ ?⌑ ?◊ ?:)
"Character for replacing definition list markup.
This may be a single character or a list of characters. In case
of a list, the first one that satisfies `char-displayable-p' will
be used."
:type '(choice
(character :tag "Single definition list character")
(repeat :tag "List of possible definition list characters" character))
:package-version '(markdown-mode . "2.3"))
(defcustom markdown-enable-math nil
"Syntax highlighting for inline LaTeX and itex expressions.
Set this to a non-nil value to turn on math support by default.
Math support can be enabled, disabled, or toggled later using
`markdown-toggle-math' or \\[markdown-toggle-math]."
:group 'markdown
:type 'boolean
:safe 'booleanp)
(make-variable-buffer-local 'markdown-enable-math)
(defcustom markdown-enable-html t
"Enable font-lock support for HTML tags and attributes."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-enable-highlighting-syntax nil
"Enable highlighting syntax."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.5"))
(defcustom markdown-css-paths nil
"List of URLs of CSS files to link to in the output XHTML."
:group 'markdown
:safe (lambda (x) (and (listp x) (cl-every #'stringp x)))
:type '(repeat (string :tag "CSS File Path")))
(defcustom markdown-content-type "text/html"
"Content type string for the http-equiv header in XHTML output.
When set to an empty string, this attribute is omitted. Defaults to
`text/html'."
:group 'markdown
:type 'string)
(defcustom markdown-coding-system nil
"Character set string for the http-equiv header in XHTML output.
Defaults to `buffer-file-coding-system' (and falling back to
`utf-8' when not available). Common settings are `iso-8859-1'
and `iso-latin-1'. Use `list-coding-systems' for more choices."
:group 'markdown
:type 'coding-system)
(defcustom markdown-export-kill-buffer t
"Kill output buffer after HTML export.
When non-nil, kill the HTML output buffer after
exporting with `markdown-export'."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-xhtml-header-content ""
"Additional content to include in the XHTML <head> block."
:group 'markdown
:type 'string)
(defcustom markdown-xhtml-body-preamble ""
"Content to include in the XHTML <body> block, before the output."
:group 'markdown
:type 'string
:safe 'stringp
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-xhtml-body-epilogue ""
"Content to include in the XHTML <body> block, after the output."
:group 'markdown
:type 'string
:safe 'stringp
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-xhtml-standalone-regexp
"^\\(<\\?xml\\|<!DOCTYPE\\|<html\\)"
"Regexp indicating whether `markdown-command' output is standalone XHTML."
:group 'markdown
:type 'regexp)
(defcustom markdown-link-space-sub-char "_"
"Character to use instead of spaces when mapping wiki links to filenames."
:group 'markdown
:type 'string)
(defcustom markdown-reference-location 'header
"Position where new reference definitions are inserted in the document."
:group 'markdown
:type '(choice (const :tag "At the end of the document" end)
(const :tag "Immediately after the current block" immediately)
(const :tag "At the end of the subtree" subtree)
(const :tag "Before next header" header)))
(defcustom markdown-footnote-location 'end
"Position where new footnotes are inserted in the document."
:group 'markdown
:type '(choice (const :tag "At the end of the document" end)
(const :tag "Immediately after the current block" immediately)
(const :tag "At the end of the subtree" subtree)
(const :tag "Before next header" header)))
(defcustom markdown-footnote-display '((raise 0.2) (height 0.8))
"Display specification for footnote markers and inline footnotes.
By default, footnote text is reduced in size and raised. Set to
nil to disable this."
:group 'markdown
:type '(choice (sexp :tag "Display specification")
(const :tag "Don't set display property" nil))
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-sub-superscript-display
'(((raise -0.3) (height 0.7)) . ((raise 0.3) (height 0.7)))
"Display specification for subscript and superscripts.
The car is used for subscript, the cdr is used for superscripts."
:group 'markdown
:type '(cons (choice (sexp :tag "Subscript form")
(const :tag "No lowering" nil))
(choice (sexp :tag "Superscript form")
(const :tag "No raising" nil)))
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-unordered-list-item-prefix " * "
"String inserted before unordered list items."
:group 'markdown
:type 'string)
(defcustom markdown-ordered-list-enumeration t
"When non-nil, use enumerated numbers(1. 2. 3. etc.) for ordered list marker.
While nil, always uses '1.' for the marker"
:group 'markdown
:type 'boolean
:package-version '(markdown-mode . "2.5"))
(defcustom markdown-nested-imenu-heading-index t
"Use nested or flat imenu heading index.
A nested index may provide more natural browsing from the menu,
but a flat list may allow for faster keyboard navigation via tab
completion."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.2"))
(defcustom markdown-add-footnotes-to-imenu t
"Add footnotes to end of imenu heading index."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-make-gfm-checkboxes-buttons t
"When non-nil, make GFM checkboxes into buttons."
:group 'markdown
:type 'boolean)
(defcustom markdown-use-pandoc-style-yaml-metadata nil
"When non-nil, allow YAML metadata anywhere in the document."
:group 'markdown
:type 'boolean)
(defcustom markdown-split-window-direction 'any
"Preference for splitting windows for static and live preview.
The default value is \\='any, which instructs Emacs to use
`split-window-sensibly' to automatically choose how to split
windows based on the values of `split-width-threshold' and
`split-height-threshold' and the available windows. To force
vertically split (left and right) windows, set this to \\='vertical
or \\='right. To force horizontally split (top and bottom) windows,
set this to \\='horizontal or \\='below.
If this value is \\='any and `display-buffer-alist' is set then
`display-buffer' is used for open buffer function"
:group 'markdown
:type '(choice (const :tag "Automatic" any)
(const :tag "Right (vertical)" right)
(const :tag "Below (horizontal)" below))
:package-version '(markdown-mode . "2.2"))
(defcustom markdown-live-preview-window-function
#'markdown-live-preview-window-eww
"Function to display preview of Markdown output within Emacs.
Function must update the buffer containing the preview and return
the buffer."
:group 'markdown
:type 'function)
(defcustom markdown-live-preview-delete-export 'delete-on-destroy
"Delete exported HTML file when using `markdown-live-preview-export'.
If set to \\='delete-on-export, delete on every export. When set to
\\='delete-on-destroy delete when quitting from command
`markdown-live-preview-mode'. Never delete if set to nil."
:group 'markdown
:type '(choice
(const :tag "Delete on every export" delete-on-export)
(const :tag "Delete when quitting live preview" delete-on-destroy)
(const :tag "Never delete" nil)))
(defcustom markdown-list-indent-width 4
"Depth of indentation for markdown lists.
Used in `markdown-demote-list-item' and
`markdown-promote-list-item'."
:group 'markdown
:type 'integer)
(defcustom markdown-enable-prefix-prompts t
"Display prompts for certain prefix commands.
Set to nil to disable these prompts."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.3"))
(defcustom markdown-gfm-additional-languages nil
"Extra languages made available when inserting GFM code blocks.
Language strings must have be trimmed of whitespace and not
contain any curly braces. They may be of arbitrary
capitalization, though."
:group 'markdown
:type '(repeat (string :validate markdown-validate-language-string)))
(defcustom markdown-gfm-use-electric-backquote t
"Use `markdown-electric-backquote' when backquote is hit three times."
:group 'markdown
:type 'boolean)
(defcustom markdown-gfm-downcase-languages t
"If non-nil, downcase suggested languages.
This applies to insertions done with
`markdown-electric-backquote'."
:group 'markdown
:type 'boolean)
(defcustom markdown-edit-code-block-default-mode 'normal-mode
"Default mode to use for editing code blocks.
This mode is used when automatic detection fails, such as for GFM
code blocks with no language specified."
:group 'markdown
:type '(choice function (const :tag "None" nil))
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-gfm-uppercase-checkbox nil
"If non-nil, use [X] for completed checkboxes, [x] otherwise."
:group 'markdown
:type 'boolean
:safe 'booleanp)
(defcustom markdown-hide-urls nil
"Hide URLs of inline links and reference tags of reference links.
Such URLs will be replaced by a single customizable
character, defined by `markdown-url-compose-char', but are still part
of the buffer. Links can be edited interactively with
\\[markdown-insert-link] or, for example, by deleting the final
parenthesis to remove the invisibility property. You can also
hover your mouse pointer over the link text to see the URL.
Set this to a non-nil value to turn this feature on by default.
You can interactively set the value of this variable by calling
`markdown-toggle-url-hiding', pressing \\[markdown-toggle-url-hiding],
or from the menu Markdown > Links & Images menu."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.3"))
(make-variable-buffer-local 'markdown-hide-urls)
(defcustom markdown-translate-filename-function #'identity
"Function to use to translate filenames when following links.
\\<markdown-mode-map>\\[markdown-follow-thing-at-point] and \\[markdown-follow-link-at-point]
call this function with the filename as only argument whenever
they encounter a filename (instead of a URL) to be visited and
use its return value instead of the filename in the link. For
example, if absolute filenames are actually relative to a server
root directory, you can set
`markdown-translate-filename-function' to a function that
prepends the root directory to the given filename."
:group 'markdown
:type 'function
:risky t
:package-version '(markdown-mode . "2.4"))
(defcustom markdown-max-image-size nil
"Maximum width and height for displayed inline images.
This variable may be nil or a cons cell (MAX-WIDTH . MAX-HEIGHT).
When nil, use the actual size. Otherwise, use ImageMagick to
resize larger images to be of the given maximum dimensions. This
requires Emacs to be built with ImageMagick support."
:group 'markdown
:package-version '(markdown-mode . "2.4")
:type '(choice
(const :tag "Use actual image width" nil)
(cons (choice (sexp :tag "Maximum width in pixels")
(const :tag "No maximum width" nil))
(choice (sexp :tag "Maximum height in pixels")
(const :tag "No maximum height" nil)))))
(defcustom markdown-mouse-follow-link t
"Non-nil means mouse on a link will follow the link.
This variable must be set before loading markdown-mode."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.5"))
(defcustom markdown-table-align-p t
"Non-nil means that table is aligned after table operation."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.5"))
(defcustom markdown-fontify-whole-heading-line nil
"Non-nil means fontify the whole line for headings.
This is useful when setting a background color for the
markdown-header-face-* faces."
:group 'markdown
:type 'boolean
:safe 'booleanp
:package-version '(markdown-mode . "2.5"))
(defcustom markdown-special-ctrl-a/e nil
"Non-nil means `C-a' and `C-e' behave specially in headlines and items.
When t, `C-a' will bring back the cursor to the beginning of the
headline text. In an item, this will be the position after bullet
and check-box, if any. When the cursor is already at that
position, another `C-a' will bring it to the beginning of the
line.
`C-e' will jump to the end of the headline, ignoring the presence
of closing tags in the headline. A second `C-e' will then jump to
the true end of the line, after closing tags. This also means
that, when this variable is non-nil, `C-e' also will never jump
beyond the end of the heading of a folded section, i.e. not after
the ellipses.
When set to the symbol `reversed', the first `C-a' or `C-e' works
normally, going to the true line boundary first. Only a directly
following, identical keypress will bring the cursor to the
special positions.
This may also be a cons cell where the behavior for `C-a' and
`C-e' is set separately."
:group 'markdown
:type '(choice
(const :tag "off" nil)
(const :tag "on: after hashes/bullet and before closing tags first" t)
(const :tag "reversed: true line boundary first" reversed)
(cons :tag "Set C-a and C-e separately"
(choice :tag "Special C-a"
(const :tag "off" nil)
(const :tag "on: after hashes/bullet first" t)
(const :tag "reversed: before hashes/bullet first" reversed))
(choice :tag "Special C-e"
(const :tag "off" nil)
(const :tag "on: before closing tags first" t)
(const :tag "reversed: after closing tags first" reversed))))
:package-version '(markdown-mode . "2.7"))
;;; Markdown-Specific `rx' Macro ==============================================
;; Based on python-rx from python.el.
(defmacro markdown-rx (&rest regexps)
"Markdown mode specialized rx macro.
This variant of `rx' supports common Markdown named REGEXPS."
`(rx-let ((newline "\n")
;; Note: #405 not consider markdown-list-indent-width however this is never used
(indent (or (repeat 4 " ") "\t"))
(block-end (and (or (one-or-more (zero-or-more blank) "\n") line-end)))
(numeral (and (one-or-more (any "0-9#")) "."))
(bullet (any "*+:-"))
(list-marker (or (and (one-or-more (any "0-9#")) ".")
(any "*+:-")))
(checkbox (seq "[" (any " xX") "]")))
(rx ,@regexps)))
;;; Regular Expressions =======================================================
(defconst markdown-regex-comment-start
"<!--"
"Regular expression matches HTML comment opening.")
(defconst markdown-regex-comment-end
"--[ \t]*>"
"Regular expression matches HTML comment closing.")
(defconst markdown-regex-link-inline
"\\(?1:!\\)?\\(?2:\\[\\)\\(?3:\\^?\\(?:\\\\\\]\\|[^]]\\)*\\|\\)\\(?4:\\]\\)\\(?5:(\\)\\s-*\\(?6:[^)]*?\\)\\(?:\\s-+\\(?7:\"[^\"]*\"\\)\\)?\\s-*\\(?8:)\\)"
"Regular expression for a [text](file) or an image link .
Group 1 matches the leading exclamation point (optional).
Group 2 matches the opening square bracket.
Group 3 matches the text inside the square brackets.
Group 4 matches the closing square bracket.
Group 5 matches the opening parenthesis.
Group 6 matches the URL.
Group 7 matches the title (optional).
Group 8 matches the closing parenthesis.")
(defconst markdown-regex-link-reference
"\\(?1:!\\)?\\(?2:\\[\\)\\(?3:[^]^][^]]*\\|\\)\\(?4:\\]\\)\\(?5:\\[\\)\\(?6:[^]]*?\\)\\(?7:\\]\\)"
"Regular expression for a reference link [text][id].
Group 1 matches the leading exclamation point (optional).
Group 2 matches the opening square bracket for the link text.
Group 3 matches the text inside the square brackets.
Group 4 matches the closing square bracket for the link text.
Group 5 matches the opening square bracket for the reference label.
Group 6 matches the reference label.
Group 7 matches the closing square bracket for the reference label.")
(defconst markdown-regex-reference-definition
"^ \\{0,3\\}\\(?1:\\[\\)\\(?2:[^]\n]+?\\)\\(?3:\\]\\)\\(?4::\\)\\s *\\(?5:.*?\\)\\s *\\(?6: \"[^\"]*\"$\\|$\\)"
"Regular expression for a reference definition.
Group 1 matches the opening square bracket.
Group 2 matches the reference label.
Group 3 matches the closing square bracket.
Group 4 matches the colon.
Group 5 matches the URL.
Group 6 matches the title attribute (optional).")
(defconst markdown-regex-footnote
"\\(?1:\\[\\^\\)\\(?2:.+?\\)\\(?3:\\]\\)"
"Regular expression for a footnote marker [^fn].
Group 1 matches the opening square bracket and carat.
Group 2 matches only the label, without the surrounding markup.
Group 3 matches the closing square bracket.")
(defconst markdown-regex-header
"^\\(?:\\(?1:[^\r\n\t -].*\\)\n\\(?:\\(?2:=+\\)\\|\\(?3:-+\\)\\)\\|\\(?4:#+[ \t]+\\)\\(?5:.*?\\)\\(?6:[ \t]+#+\\)?\\)$"
"Regexp identifying Markdown headings.
Group 1 matches the text of a setext heading.
Group 2 matches the underline of a level-1 setext heading.
Group 3 matches the underline of a level-2 setext heading.
Group 4 matches the opening hash marks of an atx heading and whitespace.
Group 5 matches the text, without surrounding whitespace, of an atx heading.
Group 6 matches the closing whitespace and hash marks of an atx heading.")
(defconst markdown-regex-header-setext
"^\\([^\r\n\t -].*\\)\n\\(=+\\|-+\\)$"
"Regular expression for generic setext-style (underline) headers.")
(defconst markdown-regex-header-atx
"^\\(#+\\)[ \t]+\\(.*?\\)[ \t]*\\(#*\\)$"
"Regular expression for generic atx-style (hash mark) headers.")
(defconst markdown-regex-hr
(rx line-start
(group (or (and (repeat 3 (and "*" (? " "))) (* (any "* ")))
(and (repeat 3 (and "-" (? " "))) (* (any "- ")))
(and (repeat 3 (and "_" (? " "))) (* (any "_ ")))))
line-end)
"Regular expression for matching Markdown horizontal rules.")
(defconst markdown-regex-code
"\\(?:\\`\\|[^\\]\\)\\(?1:\\(?2:`+\\)\\(?3:\\(?:.\\|\n[^\n]\\)*?[^`]\\)\\(?4:\\2\\)\\)\\(?:[^`]\\|\\'\\)"
"Regular expression for matching inline code fragments.
Group 1 matches the entire code fragment including the backquotes.
Group 2 matches the opening backquotes.
Group 3 matches the code fragment itself, without backquotes.
Group 4 matches the closing backquotes.
The leading, unnumbered group ensures that the leading backquote
character is not escaped.
The last group, also unnumbered, requires that the character
following the code fragment is not a backquote.
Note that \\(?:.\\|\n[^\n]\\) matches any character, including newlines,
but not two newlines in a row.")
(defconst markdown-regex-kbd
"\\(?1:<kbd>\\)\\(?2:\\(?:.\\|\n[^\n]\\)*?\\)\\(?3:</kbd>\\)"
"Regular expression for matching <kbd> tags.
Groups 1 and 3 match the opening and closing tags.
Group 2 matches the key sequence.")
(defconst markdown-regex-gfm-code-block-open
"^[[:blank:]]*\\(?1:```\\)\\(?2:[[:blank:]]*{?[[:blank:]]*\\)\\(?3:[^`[:space:]]+?\\)?\\(?:[[:blank:]]+\\(?4:.+?\\)\\)?\\(?5:[[:blank:]]*}?[[:blank:]]*\\)$"
"Regular expression matching opening of GFM code blocks.
Group 1 matches the opening three backquotes and any following whitespace.
Group 2 matches the opening brace (optional) and surrounding whitespace.
Group 3 matches the language identifier (optional).
Group 4 matches the info string (optional).
Group 5 matches the closing brace (optional), whitespace, and newline.
Groups need to agree with `markdown-regex-tilde-fence-begin'.")
(defconst markdown-regex-gfm-code-block-close
"^[[:blank:]]*\\(?1:```\\)\\(?2:\\s *?\\)$"
"Regular expression matching closing of GFM code blocks.
Group 1 matches the closing three backquotes.
Group 2 matches any whitespace and the final newline.")
(defconst markdown-regex-pre
"^\\( \\|\t\\).*$"
"Regular expression for matching preformatted text sections.")
(defconst markdown-regex-list
(markdown-rx line-start
;; 1. Leading whitespace
(group (* blank))
;; 2. List marker: a numeral, bullet, or colon
(group list-marker)
;; 3. Trailing whitespace
(group (+ blank))
;; 4. Optional checkbox for GFM task list items
(opt (group (and checkbox (* blank)))))
"Regular expression for matching list items.")
(defconst markdown-regex-bold
"\\(?1:^\\|[^\\]\\)\\(?2:\\(?3:\\*\\*\\|__\\)\\(?4:[^ \n\t\\]\\|[^ \n\t]\\(?:.\\|\n[^\n]\\)*?[^\\ ]\\)\\(?5:\\3\\)\\)"
"Regular expression for matching bold text.
Group 1 matches the character before the opening asterisk or
underscore, if any, ensuring that it is not a backslash escape.
Group 2 matches the entire expression, including delimiters.
Groups 3 and 5 matches the opening and closing delimiters.
Group 4 matches the text inside the delimiters.")
(defconst markdown-regex-italic
"\\(?:^\\|[^\\]\\)\\(?1:\\(?2:[*_]\\)\\(?3:[^ \n\t\\]\\|[^ \n\t*]\\(?:.\\|\n[^\n]\\)*?[^\\ ]\\)\\(?4:\\2\\)\\)"
"Regular expression for matching italic text.
The leading unnumbered matches the character before the opening
asterisk or underscore, if any, ensuring that it is not a
backslash escape.
Group 1 matches the entire expression, including delimiters.
Groups 2 and 4 matches the opening and closing delimiters.
Group 3 matches the text inside the delimiters.")
(defconst markdown-regex-strike-through
"\\(?1:^\\|[^\\]\\)\\(?2:\\(?3:~~\\)\\(?4:[^ \n\t\\]\\|[^ \n\t]\\(?:.\\|\n[^\n]\\)*?[^\\ ]\\)\\(?5:~~\\)\\)"
"Regular expression for matching strike-through text.
Group 1 matches the character before the opening tilde, if any,
ensuring that it is not a backslash escape.
Group 2 matches the entire expression, including delimiters.
Groups 3 and 5 matches the opening and closing delimiters.
Group 4 matches the text inside the delimiters.")
(defconst markdown-regex-gfm-italic
"\\(?:^\\|[^\\]\\)\\(?1:\\(?2:[*_]\\)\\(?3:[^ \\]\\2\\|[^ ]\\(?:.\\|\n[^\n]\\)*?\\)\\(?4:\\2\\)\\)"
"Regular expression for matching italic text in GitHub Flavored Markdown.
Underscores in words are not treated as special.
Group 1 matches the entire expression, including delimiters.
Groups 2 and 4 matches the opening and closing delimiters.
Group 3 matches the text inside the delimiters.")
(defconst markdown-regex-blockquote
"^[ \t]*\\(?1:[A-Z]?>\\)\\(?2:[ \t]*\\)\\(?3:.*\\)$"
"Regular expression for matching blockquote lines.
Also accounts for a potential capital letter preceding the angle
bracket, for use with Leanpub blocks (asides, warnings, info
blocks, etc.).
Group 1 matches the leading angle bracket.
Group 2 matches the separating whitespace.
Group 3 matches the text.")
(defconst markdown-regex-line-break
"[^ \n\t][ \t]*\\( \\)\n"
"Regular expression for matching line breaks.")
(defconst markdown-regex-escape
"\\(\\\\\\)."
"Regular expression for matching escape sequences.")
(defconst markdown-regex-wiki-link
"\\(?:^\\|[^\\]\\)\\(?1:\\(?2:\\[\\[\\)\\(?3:[^]|]+\\)\\(?:\\(?4:|\\)\\(?5:[^]]+\\)\\)?\\(?6:\\]\\]\\)\\)"
"Regular expression for matching wiki links.
This matches typical bracketed [[WikiLinks]] as well as \\='aliased
wiki links of the form [[PageName|link text]].
The meanings of the first and second components depend
on the value of `markdown-wiki-link-alias-first'.
Group 1 matches the entire link.
Group 2 matches the opening square brackets.
Group 3 matches the first component of the wiki link.
Group 4 matches the pipe separator, when present.
Group 5 matches the second component of the wiki link, when present.
Group 6 matches the closing square brackets.")
(defconst markdown-regex-uri
(concat "\\(" (regexp-opt markdown-uri-types) ":[^]\t\n\r<>; ]+\\)")
"Regular expression for matching inline URIs.")
;; CommanMark specification says scheme length is 2-32 characters
(defconst markdown-regex-angle-uri
(concat "\\(<\\)\\([a-z][a-z0-9.+-]\\{1,31\\}:[^]\t\n\r<>,;()]+\\)\\(>\\)")
"Regular expression for matching inline URIs in angle brackets.")
(defconst markdown-regex-email
"<\\(\\(?:\\sw\\|\\s_\\|\\s.\\)+@\\(?:\\sw\\|\\s_\\|\\s.\\)+\\)>"
"Regular expression for matching inline email addresses.")
(defsubst markdown-make-regex-link-generic ()
"Make regular expression for matching any recognized link."
(concat "\\(?:" markdown-regex-link-inline
(when markdown-enable-wiki-links
(concat "\\|" markdown-regex-wiki-link))
"\\|" markdown-regex-link-reference
"\\|" markdown-regex-angle-uri "\\)"))
(defconst markdown-regex-gfm-checkbox
" \\(\\[[ xX]\\]\\) "
"Regular expression for matching GFM checkboxes.
Group 1 matches the text to become a button.")
(defconst markdown-regex-blank-line
"^[[:blank:]]*$"
"Regular expression that matches a blank line.")
(defconst markdown-regex-block-separator
"\n[\n\t\f ]*\n"
"Regular expression for matching block boundaries.")
(defconst markdown-regex-block-separator-noindent
(concat "\\(\\`\\|\\(" markdown-regex-block-separator "\\)[^\n\t\f ]\\)")
"Regexp for block separators before lines with no indentation.")
(defconst markdown-regex-math-inline-single
"\\(?:^\\|[^\\]\\)\\(?1:\\$\\)\\(?2:\\(?:[^\\$]\\|\\\\.\\)*\\)\\(?3:\\$\\)"
"Regular expression for itex $..$ math mode expressions.
Groups 1 and 3 match the opening and closing dollar signs.
Group 2 matches the mathematical expression contained within.")
(defconst markdown-regex-math-inline-double
"\\(?:^\\|[^\\]\\)\\(?1:\\$\\$\\)\\(?2:\\(?:[^\\$]\\|\\\\.\\)*\\)\\(?3:\\$\\$\\)"
"Regular expression for itex $$..$$ math mode expressions.
Groups 1 and 3 match opening and closing dollar signs.
Group 2 matches the mathematical expression contained within.")
(defconst markdown-regex-math-display
(rx line-start (* blank)
(group (group (repeat 1 2 "\\")) "[")
(group (*? anything))
(group (backref 2) "]")
line-end)
"Regular expression for \[..\] or \\[..\\] display math.
Groups 1 and 4 match the opening and closing markup.
Group 3 matches the mathematical expression contained within.
Group 2 matches the opening slashes, and is used internally to
match the closing slashes.")
(defsubst markdown-make-tilde-fence-regex (num-tildes &optional end-of-line)
"Return regexp matching a tilde code fence at least NUM-TILDES long.
END-OF-LINE is the regexp construct to indicate end of line; $ if
missing."
(format "%s%d%s%s" "^[[:blank:]]*\\([~]\\{" num-tildes ",\\}\\)"
(or end-of-line "$")))
(defconst markdown-regex-tilde-fence-begin
(markdown-make-tilde-fence-regex
3 "\\([[:blank:]]*{?\\)[[:blank:]]*\\([^[:space:]]+?\\)?\\(?:[[:blank:]]+\\(.+?\\)\\)?\\([[:blank:]]*}?[[:blank:]]*\\)$")
"Regular expression for matching tilde-fenced code blocks.
Group 1 matches the opening tildes.
Group 2 matches (optional) opening brace and surrounding whitespace.