latexminted 0.3.0

Python library for LaTeX minted package

latexminted — Python library for LaTeX minted package

This Python package provides the Python side of the LaTeX minted package. It performs syntax highlighting using the Pygments library. It also provides several code formatting and manipulation features implemented in Python that would be difficult to perform in LaTeX, such as dedenting code and extracting code snippets from source files using regular expressions.

This package should only be installed manually if you need to use plugin packages for Pygments. The package is bundled within TeX distributions as a Python wheel along with the LaTeX minted package. Installing the LaTeX minted package with your TeX distribution's package manager will also install the latexminted Python package and all required Python libraries within the TeX installation. If you do need Pygments plugins, then install latexminted manually along with Pygments in a Python installation. Make sure that the latexminted executable that is created as part of this process has precedence on PATH over the latexminted executable in your TeX installation. For Windows, precedence on either the system PATH or the user PATH is usually sufficient, as long as the TeX installation is in a typical location and any user Python executable is within a Python installation under the user's home directory.

This Python package is specifically designed to be compatible with the LaTeX security requirements for restricted shell escape executables. These trusted executables can run during LaTeX compilation without requiring -shell-escape or similar command-line options that allow arbitrary shell commands to be executed.

Configuration

Several minted settings with security implications can be customized with a config file .latexminted_config. This config file is loaded by the latexminted Python executable when it runs.

The latexminted Python executable looks for .latexminted_config files in the following locations:

• User home directory, as found by Python's pathlib.Path.home().

• TEXMFHOME. With MiKTeX on systems with multiple MiKTeX installations, this will be the TEXMFHOME from the first MiKTeX installation on PATH. With TeX Live on Windows systems with multiple TeX Live installations, this will be the TEXMFHOME from the first TeX Live installation on PATH. In all other cases, TEXMFHOME will correspond to the currently active TeX installation. See the latexrestricted documentation for details. latexrestricted is used by the latexminted Python executable to retrieve the value of TEXMFHOME.

• The current TeX working directory. Note that enable_cwd_config must be set true in the .latexminted_config in the user home directory or in the TEXMFHOME directory to enable this; .latexminted_config in the current TeX working directory is not enabled by default for security reasons. Even when a config file in the current TeX working directory is enabled, it cannot be used to modify certain security-related settings.

Overall configuration is derived by merging all config files, with later files in the list above having precedence over earlier files. Boolean and string values are overwritten by later config files. Collection values (currently only sets derived from lists) are merged with earlier values.

File format

The .latexminted_config file may be in Python literal format (dicts and lists of strings and bools), JSON, or TOML (requires Python 3.11+). It must be encoded as UTF-8.

Settings

• security: dict[str, str | bool]: These settings relate to latexminted security. They can only be set in .latexminted_config in the user home directory or in TEXMFHOME. They cannot be set in .latexminted_config in the current TeX working directory.

  • enable_cwd_config: bool = False: Load a .latexminted_config file from the current TeX working directory if it exists. This is disabled by default because the config file can enable custom_lexers, which is equivalent to arbitrary code execution.

  • file_path_analysis: "resolve" | "string" = "resolve": This specifies how latexminted determines whether files are readable and writable. Relative file paths are always treated as being relative to the current TeX working directory.

    With resolve, any symlinks in file paths are resolved with the file system before paths are compared with permitted LaTeX read/write locations. Arbitrary relative paths including .. are allowed so long as the final location is permitted.

    With string, paths are analyzed as strings in comparing them with permitted LaTeX read/write locations. This follows the approach taken in TeX's file system security. Paths cannot contain .. to access a parent directory, even if the parent directory is a valid location. Because symlinks are not resolved with the file system, it is possible to access locations outside permitted LaTeX read/write locations, if the permitted locations contain symlinks to elsewhere.

  • permitted_pathext_file_extensions: list[str]: As a security measure under Windows, LaTeX cannot write files with file extensions in PATHEXT, such as .bat and .exe. This setting allows latexminted to write files with the specified file extensions, overriding LaTeX security. File extensions should be in the form .<ext>, for example, .bat. This setting is used in extracting source code from LaTeX documents and saving it in standalone source files.

    When these file extensions are enabled for writing, as a security measure latexminted will only allow them to be created in subdirectories of the current TeX working directory, TEXMFOUTPUT, and TEXMF_OUTPUT_DIRECTORY. These files cannot be created directly under the TeX working directory, TEXMFOUTPUT, and TEXMF_OUTPUT_DIRECTORY because those locations are more likely to be used as a working directory in a shell, and thus writing executable files in those locations would increase the risk of accidental code execution.

• custom_lexers: dict[str, str | list[str]]: This is a mapping of custom lexer file names to SHA256 hashes. Only custom lexers with these file names and the corresponding hashes are permitted. Lists of hashes are allowed to permit multiple versions of a lexer with a given file name. All other custom lexers are prohibited, because loading custom lexers is equivalent to arbitrary code execution. For example:

  "custom_lexers": {
    "mylexer.py": "<sha256>"
  }
  

  Note that this only applies to custom lexers in standalone Python files. Lexers that are installed within Python as plugin packages work automatically with Pygments and do not need to be enabled separately. However, in that case it is necessary to install latexminted and Pygments within a Python installation. When TeX package managers install latexminted and Pygments within a TeX installation, these are not compatible with Pygments plugin packages.