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+title: CodeHilite Extension
+
+# CodeHilite
+
+## Summary
+
+The CodeHilite extension adds code/syntax highlighting to standard
+Python-Markdown code blocks using [Pygments][].
+
+[Pygments]: http://pygments.org/
+
+This extension is included in the standard Markdown library.
+
+## Setup
+
+### Step 1: Download and Install Pygments
+
+You will also need to [download][dl] and install the Pygments package on your
+`PYTHONPATH`. The CodeHilite extension will produce HTML output without
+Pygments, but it won't highlight anything (same behavior as setting
+`use_pygments` to `False`).
+
+[dl]: http://pygments.org/download/
+
+### Step 2: Add CSS Classes
+
+You will need to define the appropriate CSS classes with appropriate rules.
+The CSS rules either need to be defined in or linked from the header of your
+HTML templates. Pygments can generate CSS rules for you. Just run the following
+command from the command line:
+
+```bash
+pygmentize -S default -f html -a .codehilite > styles.css
+```
+
+If you are using a different `css_class` (default: `.codehilite`), then
+set the value of the `-a` option to that class name. The CSS rules will be
+written to the `styles.css` file which you can copy to your site and link from
+your HTML templates.
+
+If you would like to use a different theme, swap out `default` for the desired
+theme. For a list of themes installed on your system (additional themes can be
+installed via Pygments plugins), run the following command:
+
+```bash
+pygmentize -L style
+```
+
+See Pygments' excellent [documentation] for more details. If no language is
+defined, Pygments will attempt to guess the language. When that fails, the code
+block will not be highlighted.
+
+!!! note "See Also"
+
+    GitHub user [richeland] has provided a number of different [CSS style
+    sheets][rich] which work with Pygments along with a [preview] of each theme.
+    The `css_class` used is the same as the default value for that option
+    (`.codehilite`). However, the Python-Markdown project makes no guarantee that
+    richeland's CSS styles will work with the version of Pygments you are using.
+    To ensure complete compatibility, you should generate the CSS rules from
+    your own installation of Pygments.
+
+[richeland]: https://github.com/richleland
+[rich]: https://github.com/richleland/pygments-css
+[preview]: http://richleland.github.io/pygments-css/
+[documentation]: http://pygments.org/docs/
+
+## Syntax
+
+The CodeHilite extension follows the same [syntax][] as regular Markdown code
+blocks, with one exception. The highlighter needs to know what language to use for
+the code block. There are three ways to tell the highlighter what language the
+code block contains and each one has a different result.
+
+!!! Note
+    The format of the language identifier only effects the display of line numbers
+    if `linenums` is set to `None` (the default). If set to `True` or `False`
+    (see [Usage](#usage) below) the format of the identifier has no effect on the
+    display of line numbers -- it only serves as a means to define the language
+    of the code block.
+
+[syntax]: http://daringfireball.net/projects/markdown/syntax#precode
+
+### Shebang (with path)
+
+If the first line of the code block contains a shebang, the language is derived
+from that and line numbers are used.
+
+```md
+    #!/usr/bin/python
+    # Code goes here ...
+```
+
+Will result in:
+
+    #!/usr/bin/python
+    # Code goes here ...
+
+### Shebang (no path)
+
+If the first line contains a shebang, but the shebang line does not contain a
+path (a single `/` or even a space), then that line is removed from the code
+block before processing. Line numbers are used.
+
+```md
+    #!python
+    # Code goes here ...
+```
+
+Will result in:
+
+    #!python
+    # Code goes here ...
+
+### Colons
+
+If the first line begins with three or more colons, the text following the
+colons identifies the language. The first line is removed from the code block
+before processing and line numbers are not used.
+
+```md
+    :::python
+    # Code goes here ...
+```
+
+Will result in:
+
+    :::python
+    # Code goes here ...
+
+Certain lines can be selected for emphasis with the colon syntax. When
+using Pygments' default CSS styles, emphasized lines have a yellow background.
+This is useful to direct the reader's attention to specific lines.
+
+    :::python hl_lines="1 3"
+    # This line is emphasized
+    # This line isn't
+    # This line is emphasized
+
+!!! Note
+    `hl_lines` is named for Pygments' option meaning "highlighted lines".
+
+### When No Language is Defined
+
+CodeHilite is completely backwards compatible so that if a code block is
+encountered that does not define a language, the block is simply wrapped in
+`<pre>` tags and output.
+
+```md
+    # Code goes here ...
+```
+
+Will result in:
+
+    # Code goes here ...
+
+Lets see the source for that:
+
+```html
+<div class="codehilite"><pre><code># Code goes here ...
+</code></pre></div>
+```
+
+!!! Note
+    When no language is defined, the Pygments highlighting engine will try to guess
+    the language (unless `guess_lang` is set to `False`). Upon failure, the same
+    behavior will happen as described above.
+
+## Usage
+
+See [Extensions](index.md) for general extension usage, specify
+`markdown.extensions.codehilite` as the name of the extension.
+
+See the [Library Reference](../reference.md#extensions) for information about
+configuring extensions.
+
+The following options are provided to configure the output:
+
+* **`linenums`**:
+    Use line numbers. Possible values are `True` for yes, `False` for no and
+    `None` for auto. Defaults to `None`.
+
+    Using `True` will force every code block to have line numbers, even when
+    using colons (`:::`) for language identification.
+
+    Using `False` will turn off all line numbers, even when using shebangs
+    (`#!`) for language identification.
+
+* **`guess_lang`**:
+    Automatic language detection. Defaults to `True`.
+
+    Using `False` will prevent Pygments from guessing the language, and thus
+    highlighting blocks only when you explicitly set the language.
+
+* **`css_class`**:
+    Set CSS class name for the wrapper `<div>` tag. Defaults to
+    `codehilite`.
+
+* **`pygments_style`**:
+    Pygments HTML Formatter Style (`ColorScheme`). Defaults to `default`.
+
+    !!! Note
+        This is useful only when `noclasses` is set to `True`, otherwise the
+        CSS styles must be provided by the end user.
+
+* **`noclasses`**:
+    Use inline styles instead of CSS classes. Defaults to `False`.
+
+* **`use_pygments`**:
+    Defaults to `True`. Set to `False` to disable the use of Pygments.
+    If a language is defined for a code block, it will be assigned to the
+    `<code>` tag as a class in the manner suggested by the [HTML5 spec][spec]
+    (alternate output will not be entertained) and might be used by a JavaScript
+    library in the browser to highlight the code block.
+
+[spec]: http://www.w3.org/TR/html5/text-level-semantics.html#the-code-element