More Markdown, Less less
mdless is a utility that provides a formatted and highlighted view of Markdown files in Terminal.
I often use iTerm2 in visor mode, so even with a Quick Look plugin,l
qlmanage -p is annoying. I still wanted a way to view Markdown files quickly and without cruft.
- Built in pager functionality with pipe capability,
lessreplacement for Markdown files
- Format tables
- Colorize Markdown syntax for most elements
- Normalize spacing and link formatting
- Display footnotes after each paragraph
- Inline image display (local, optionally remote) if using iTerm2 2.9+
- Syntax highlighting when Pygments is installed
- Only fenced code with a language defined (e.g. “```python”) will be highlighted
- Languages can also be determined by hashbang in the code block
- List headlines in document
- Display single section of the document based on headlines
- Customizable colors
gem install mdless
mdless [options] path or
cat [path] | mdless
The pager used is determined by system configuration in this order of preference:
git config --get-all core.pager
-c, --[no-]color Colorize output (default on) -d, --debug LEVEL Level of debug messages to output -h, --help Display this screen -i, --images=TYPE Include [local|remote (both)] images in output (requires imgcat and iTerm2, default NONE) -I, --all-images Include local and remote images in output (requires imgcat and iTerm2) --links=FORMAT Link style ([inline, reference], default inline) [NOT CURRENTLY IMPLEMENTED] -l, --list List headers in document and exit -p, --[no-]pager Formatted output to pager (default on) -P Disable pager (same as --no-pager) -s, --section=NUMBER Output only a headline-based section of the input (numeric from --list) -t, --theme=THEME_NAME Specify an alternate color theme to load -v, --version Display version number -w, --width=COLUMNS Column width to format for (default terminal width)
On first run a default theme file will be placed in
~/.config/mdless/mdless.theme. You can edit this file to modify the colors mdless uses when highlighting your files. You can copy this file and create multiple theme options which can be specified with the
-t NAME option. For example, create
~/.config/mdless/brett.theme and then call
mdless -t brett filename.md.
Colors are limited to basic ANSI codes, with support for bold, underline, italics (if available for the terminal/font), dark and bright, and foreground and background colors.
Customizeable settings are stored in YAML format. A chunk of the settings file looks like this:
color: b intense_black on_white
pad: d black on_white
Font and color settings are set using a string of color names and modifiers. A typical string looks like
b red on_white, which would give you a bold red font on a white background. In the YAML settings file there’s no need for quotes, just put the string following the colon for the setting.
Some extra (non-color) settings are available for certain keys, e.g.
pad_char to define the right padding character used on level 1 and 2 headlines. Note that you can change the Pygments theme used for syntax highlighting with the code_block.pygments_theme setting. For a list of available styles (assuming you have Pygments installed), use
pygmentize -L styles.
Note: the ANSI escape codes are reset every time the color changes, so, for example, if you have a key that defines underlines for the url in a link, the underline will automatically be removed when it gets to a bracket. This also means that if you define a background color, you’ll need to define it again on all the keys that it should affect.
- b (bold)
- d (dark)
- i (italic)
- u (underline)
- r (reverse, negative)
To modify the emphasis, use ‘b’ (bold), ‘i’ (italic), ‘u’ (underline), e.g.
u yellow for underlined yellow. These can be combined, e.g.
b u red.
Use ‘r’ to reverse foreground and background colors.
r white on_black would display as
black on_white. ‘r’ alone will reverse the current color set for a line.
To set a background color, use
on_[color] with one of the 8 colors. This can be used with foreground colors in the same setting, e.g.
Use ‘d’ (dark) to indicate the darker version of a foreground color. On macOS (and possibly other systems) you can use the brighter version of a color by prefixing with “intense”, e.g.
Things I might get around to adding:
- Re-implement option to convert all links to reference links for display
- allow multiple theme files with command line option to specify
- Sort options order in
- Allow multiple theme files,
- Handle emphasis inside of quotes and parenthesis
- Make emphasis themeable in mdless.theme
- Fix for
-Ithrowing error if imgcat isn’t installed
- remove backslash from escaped characters
- Fix for header listing justification
- Exclude horizontal rules
---in header list
- Just a version bump because I think it deserves it at this point.
- User themeable
- Handle Setex headers
- General fixes and improvements
- Don’t run pygments on code blocks without language specified in either the fence or a hashbang on the first line
- Fix to maintain indentation for fenced code in lists
- Remove leading ~ for code blocks
- Add background color
- Add line ending marker to make more sense of code wrapping
- lowercase code block fences
- remove “end code” marker
- Highlight with monokai theme
- Black background for all (fenced) code blocks
- Better language detection for code blocks
- when available, use italic font for italics and bold-italics emphasis
- new colorization for html tags
Speaking of mdless…