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format_front_matter() and
write_front_matter() now infer the delimiter automatically
when delimiter = NULL (the new default). If x
was returned by parse_front_matter() or
read_front_matter(), the original fence style is preserved;
otherwise write_front_matter() falls back to the file
extension of path, and finally to "yaml"
(#8).
Added support for shebang lines (#!) at the start of
files. When a file begins with a shebang, the parser now recognizes
front matter in comment-wrapped formats (# ---,
#' ---) and PEP 723 (# /// script) immediately
following the shebang (with zero or one blank lines in between). The
shebang line is included in the returned body.
format_front_matter() and write_front_matter()
also move a leading shebang line above the front matter block when
writing (#5).
Added SQL front matter support with two comment styles: line
comments (-- ---/-- +++) and block comments in
compact (/* --- … --- */) and expanded
(/* + --- … --- +
*/) forms. Six new delimiter shortcuts are available for
write_front_matter(): yaml_sql_line,
toml_sql_line, yaml_sql_block_compact,
toml_sql_block_compact,
yaml_sql_block_expanded, and
toml_sql_block_expanded (#4).
New format_front_matter() and
write_front_matter() functions for serializing documents
with YAML or TOML front matter. These are the inverse of
parse_front_matter() and read_front_matter(),
enabling full roundtrip support. Supports all delimiter formats
including standard (---, +++), comment-wrapped
(# ---, #' ---), and PEP 723. Note that the
roundtrip is not perfect; comments and formatting within the front
matter content may not be preserved.
parse_front_matter() and
read_front_matter() now attach format and
fence_type as attributes to the returned list, making it
easier to preserve the original format when rewriting
documents.
Fixed an issue with parsing front matter in comment-prefixed formats (e.g., R and Python files) where the body content was not preserved correctly. The body is now retained as-is, after stripping any leading comment-prefixed empty lines.
Initial CRAN release.
Extract and parse YAML or TOML front matter from text documents
with read_front_matter() or
parse_front_matter().
Support for multiple front matter formats:
---
delimiters) and TOML (+++
delimiters)# and
#' prefixes)Fast C++ parsing with graceful handling of incomplete front matter.
Flexible parser integration: by default uses
yaml12::parse_yaml() and
tomledit::parse_toml() or you can provide custom
parsers.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.