lowdown.3 (22199B)
.\" $Id$ .\" .\" Copyright (c) 2017, 2020 Kristaps Dzonsons <kristaps@bsd.lv> .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" .Dd $Mdocdate$ .Dt LOWDOWN 3 .Os .Sh NAME .Nm lowdown .Nd simple markdown translator library .Sh LIBRARY .Lb liblowdown .Sh SYNOPSIS .In sys/queue.h .In stdio.h .In lowdown.h .Vt "struct lowdown_metadata" .Vt "struct lowdown_node" .Vt "struct lowdown_opts" .Sh DESCRIPTION This library parses .Xr lowdown 5 into various output formats. .Pp The library consists first of a high-level interface consisting of .Xr lowdown_buf 3 , .Xr lowdown_buf_diff 3 , .Xr lowdown_file 3 , and .Xr lowdown_file_diff 3 . .Pp The high-level functions interface with low-level functions that perform parsing and formatting. These consist of .Xr lowdown_doc_new 3 , .Xr lowdown_doc_parse 3 , and .Xr lowdown_doc_free 3 for parsing .Xr lowdown 5 documents into an abstract syntax tree. .Pp The front-end functions for freeing, allocation, and rendering are as follows. .Bl -bullet .It HTML5: .Bl -item -compact .It .Xr lowdown_html_free 3 .It .Xr lowdown_html_new 3 .It .Xr lowdown_html_rndr 3 .El .It gemini: .Bl -item -compact .It .Xr lowdown_gemini_free 3 .It .Xr lowdown_gemini_new 3 .It .Xr lowdown_gemini_rndr 3 .El .It LaTeX: .Bl -item -compact .It .Xr lowdown_latex_free 3 .It .Xr lowdown_latex_new 3 .It .Xr lowdown_latex_rndr 3 .El .It OpenDocument: .Bl -item -compact .It .Xr lowdown_odt_free 3 .It .Xr lowdown_odt_new 3 .It .Xr lowdown_odt_rndr 3 .El .It roff: .Bl -item -compact .It .Xr lowdown_nroff_free 3 .It .Xr lowdown_nroff_new 3 .It .Xr lowdown_nroff_rndr 3 .El .It UTF-8 ANSI terminal: .Bl -item -compact .It .Xr lowdown_term_free 3 .It .Xr lowdown_term_new 3 .It .Xr lowdown_term_rndr 3 .El .It debugging: .Bl -item -compact .It .Xr lowdown_tree_rndr 3 .El .El .Pp To compile and link, use .Xr pkg-config 1 : .Bd -literal % cc `pkg-config --cflags lowdown` -c -o sample.o sample.c % cc -o sample sample.o `pkg-config --libs lowdown` .Ed .Ss Pledge Promises The .Nm lowdown library is built to operate in security-sensitive environments, such as those using .Xr pledge 2 on .Ox . The only promise required is .Va stdio for .Xr lowdown_file_diff 3 and .Xr lowdown_file 3 : both require access to the stream for reading input. .Ss Types All .Nm lowdown functions use one or more of the following structures. .Pp The .Vt struct lowdown_opts structure manage features. It has the following fields: .Bl -tag -width Ds -offset indent .It Va unsigned int feat Features used during the parse. This bit-field may have the following bits OR'd: .Pp .Bl -tag -width Ds -compact .It Dv LOWDOWN_ATTRS Parse PHP extra link, header, and image attributes. .It Dv LOWDOWN_AUTOLINK Parse .Li http , .Li https , .Li ftp , .Li mailto , and relative links or link fragments. .It Dv LOWDOWN_COMMONMARK Tighten input parsing to the CommonMark specification. This also uses the first ordered list value instead of starting all lists at one. This feature is .Em experimental and .Em incomplete . .It Dv LOWDOWN_DEFLIST Parse PHP extra definition lists. This is currently constrained to single-key lists. .It Dv LOWDOWN_FENCED Parse GFM fenced (language-specific) code blocks. .It Dv LOWDOWN_FOOTNOTES Parse MMD style footnotes. This only supports the referenced footnote style, not the .Qq inline style. .It Dv LOWDOWN_HILITE Parse highlit sequences. This are disabled by default because it may be erroneously interpreted as section headers. .It Dv LOWDOWN_IMG_EXT Deprecated. Use .Dv LOWDOWN_ATTRS instead. .It Dv LOWDOWN_MATH Parse mathematics equations. .It Dv LOWDOWN_METADATA Parse in-document MMD metadata. For the first paragraph to count as meta-data, the first line must have a colon in it. .It Dv LOWDOWN_NOCODEIND Do not parse indented content as code blocks. .It Dv LOWDOWN_NOINTEM Do not parse emphasis within words. .It Dv LOWDOWN_STRIKE Parse strikethrough sequences. .It Dv LOWDOWN_SUPER Parse super-scripts. This accepts foo^bar, which puts the parts following the caret until whitespace in superscripts; or foo^(bar), which puts only the parts in parenthesis. .It Dv LOWDOWN_TABLES Parse GFM tables. .It Dv LOWDOWN_TASKLIST Parse GFM task list items. .El .Pp The default value is zero (none). .It Va unsigned int oflags Features used by the output generators. This bit-field may have the following enabled. Note that bits are by definition specific to an output .Va type . .Pp For .Dv LOWDOWN_HTML : .Pp .Bl -tag -width Ds -compact .It Dv LOWDOWN_HTML_ESCAPE If .Dv LOWDOWN_HTML_SKIP_HTML has not been set, escapes in-document HTML so that it is rendered as opaque text. .It Dv LOWDOWN_HTML_HARD_WRAP Retain line-breaks within paragraphs. .It Dv LOWDOWN_HTML_HEAD_IDS Have an identifier written with each header element consisting of an HTML-escaped version of the header contents. .It Dv LOWDOWN_HTML_OWASP When escaping text, be extra paranoid in following the OWASP suggestions for which characters to escape. .It Dv LOWDOWN_HTML_NUM_ENT Convert, when possible, HTML entities to their numeric form. If not set, the entities are used as given in the input. .It Dv LOWDOWN_HTML_SKIP_HTML Do not render in-document HTML at all. .El .Pp For .Dv LOWDOWN_GEMINI , there are several flags for controlling link placement. By default, links (images, autolinks, and links) are queued when specified in-line then emitted in a block sequence after the nearest block element. .Pp .Bl -tag -width Ds -compact .It Dv LOWDOWN_GEMINI_LINK_END Emit the queue of links at the end of the document instead of after the nearest block element. .It Dv LOWDOWN_GEMINI_LINK_IN Render all links within the flow of text. This will cause breakage when nested links, such as images within links, links in blockquotes, etc. It should not be used unless in carefully crafted documents. .It Dv LOWDOWN_GEMINI_LINK_NOREF Do not format link labels. Takes precedence over .Dv LOWDOWN_GEMINI_LINK_ROMAN . .It Dv LOWDOWN_GEMINI_LINK_ROMAN When formatting link labels, use lower-case Roman numerals instead of the default lowercase hexavigesimal (i.e., .Dq a , .Dq b , \&..., .Dq aa , .Dq ab , \&...). .It Dv LOWDOWN_GEMINI_METADATA Print metadata as the canonicalised key followed by a colon then the value, each on one line (newlines replaced by spaces). The metadata block is terminated by a double newline. If there is no metadata, this does nothing. .El .Pp There may only be one of .Dv LOWDOWN_GEMINI_LINK_END or .Dv LOWDOWN_GEMINI_LINK_IN . If both are specified, the latter is unset. .Pp For .Dv LOWDOWN_FODT : .Pp .Bl -tag -width Ds -compact .It Dv LOWDOWN_ODT_SKIP_HTML Do not render in-document HTML at all. Text within HTML elements remains. .El .Pp For .Dv LOWDOWN_LATEX : .Pp .Bl -tag -width Ds -compact .It Dv LOWDOWN_LATEX_NUMBERED Use the default numbering scheme for sections, subsections, etc. If not specified, these are inhibited. .It Dv LOWDOWN_LATEX_SKIP_HTML Do not render in-document HTML at all. Text within HTML elements remains. .El .Pp And for .Dv LOWDOWN_MAN and .Dv LOWDOWN_NROFF : .Pp .Bl -tag -width Ds -compact .It Dv LOWDOWN_NROFF_GROFF Use GNU extensions (i.e., for .Xr groff 1 ) when rendering output. The groff arguments must include .Fl m Ns Ar pdfmark for formatting links with .Dv LOWDOWN_MAN or .Fl m Ns Ar spdf instead of .Fl m Ns Ar s for .Dv LOWDOWN_NROFF . Applies to the .Dv LOWDOWN_MAN and .Dv LOWDOWN_NROFF output types. .It Dv LOWDOWN_NROFF_NUMBERED Use numbered sections if .Dv LOWDOWON_NROFF_GROFF is not specified. Only applies to the .Dv LOWDOWN_NROFF output type. .It Dv LOWDOWN_NROFF_SKIP_HTML Do not render in-document HTML at all. Text within HTML elements remains. .It Dv LOWDOWN_NROFF_SHORTLINK Render link URLs in short form. Applies to images, autolinks, and regular links. Only in .Dv LOWDOWN_MAN or when .Dv LOWDOWN_NROFF_GROFF is not specified. .It Dv LOWDOWN_NROFF_NOLINK Don't show links at all if they have embedded text. Applies to images and regular links. Only in .Dv LOWDOWN_MAN or when .Dv LOWDOWN_NROFF_GROFF is not specified. .El .Pp For .Dv LOWDOWN_TERM : .Pp .Bl -tag -width Ds -compact .It Dv LOWDOWN_TERM_NOANSI Don't apply ANSI style codes at all. This implies .Dv LOWDOWN_TERM_NOCOLOUR . .It Dv LOWDOWN_TERM_NOCOLOUR Don't apply ANSI colour codes. This will still show underline, bold, etc. This should not be used in difference mode, as the output will make no sense. .It Dv LOWDOWN_TERM_NOLINK Don't show links at all. Applies to images and regular links: autolinks are still shown. This may be combined with .Dv LOWDOWN_TERM_SHORTLINK to also shorten autolinks. .It Dv LOWDOWN_TERM_SHORTLINK Render link URLs in short form. Applies to images, autolinks, and regular links. This may be combined with .Dv LOWDOWN_TERM_NOLINK to only show shortened autolinks. .El .Pp For any mode, you may specify: .Pp .Bl -tag -width Ds -compact .It Dv LOWDOWN_SMARTY Don't use smart typography formatting. .It Dv LOWDOWN_STANDALONE Emit a full document instead of a document fragment. This envelope is largely populated from metadata if .Dv LOWDOWN_METADATA was provided as an option or as given in .Va meta or .Va metaovr . .El .It Va size_t maxdepth The maximum parse depth before the parser exits. Most documents will have a parse depth in the single digits. .It Va size_t cols For .Dv LOWDOWN_TERM , the .Qq soft limit for width of terminal output not including margins. If zero, 80 shall be used. .It Va size_t hmargin For .Dv LOWDOWN_TERM , the left margin (space characters). .It Va size_t vmargin For .Dv LOWDOWN_TERM , the top/bottom margin (newlines). .It Va enum lowdown_type type May be set to .Dv LOWDOWN_HTML for HTML5 output, .Dv LOWDOWN_LATEX for LaTeX, .Dv LOWDOWN_MAN for .Fl m Ns Ar an macros, .Dv LOWDOWN_FODT for .Dq flat OpenDocument, .Dv LOWDOWN_TERM for ANSI-compatible UTF-8 terminal output, .Dv LOWDOWN_GEMINI for the Gemini format, or .Dv LOWDOWN_NROFF for .Fl m Ns Ar s macros. The .Dv LOWDOWN_TREE type causes a debug tree to be written. .It Va struct lowdown_opts_odt odt If .Va type is .Dv LOWDOWN_FODT , this contains .Vt "const char *sty" , which is either .Dv NULL or the OpenDocument styles used when creating standalone documents. If .Dv NULL , the default styles are used. .It Va char **meta An array of metadata key-value pairs or .Dv NULL . Each pair must appear as if provided on one line (or multiple lines) of the input, including the terminating newline character. If not consisting of a valid pair (e.g., no newline, no colon), then it is ignored. When processed, these values are overridden by those in the document (if .Dv LOWDOWN_METADATA is specified) or by those in .Va metaovr . .It Va size_t metasz Number of pairs in .Va metaovr . .It Va char **metaovr See .Va meta . The difference is that .Va metaovr is applied after .Va meta and in-document metadata, so it overrides prior values. .It Va size_t metaovrsz Number of pairs in .Va metaovr . .El .Pp Another common structure is .Vt "struct lowdown_metadata" , which is used to hold parsed (and output-formatted) metadata keys and values if .Dv LOWDOWN_METADATA was provided as an input bit. This structure consists of the following fields: .Bl -tag -width Ds -offset indent .It Va char *key The metadata key in its lowercase, canonical form. .It Va char *value The metadata value as rendered in the current output format. This may be an empty string. .El .Pp The abstract syntax tree is encoded in .Vt struct lowdown_node , which consists of the following. .Bl -tag -width Ds -offset indent .It Va enum lowdown_rndrt type The node type. .Pq Described below. .It Va size_t id An identifier unique within the document. This can be used as a table index since the number is assigned from a monotonically increasing point during the parse. .It Va struct lowdown_node *parent The parent of the node, or .Dv NULL at the root. .It Va enum lowdown_chng chng Change tracking: whether this node was inserted .Pq Dv LOWDOWN_CHNG_INSERT , deleted .Pq Dv LOWDOWN_CHNG_DELETE , or neither .Pq Dv LOWDOWN_CHNG_NONE . .It Va struct lowdown_nodeq children A possibly-empty list of child nodes. .It Va <anon union> An anonymous union of type-specific structures. See below for a description of each one. .El .Pp The nodes may be one of the following types, with default rendering in HTML5 to illustrate functionality. .Bl -tag -width Ds -offset indent .It Dv LOWDOWN_BLOCKCODE A block-level (and possibly language-specific) snippet of code. Described by the .Li <pre><code> elements. .It Dv LOWDOWN_BLOCKHTML A block-level snippet of HTML. This is simply opaque HTML content. (Only if configured during parse.) .It Dv LOWDOWN_BLOCKQUOTE A block-level quotation. Described by the .Li <blockquote> element. .It Dv LOWDOWN_CODESPAN A snippet of code. Described by the .Li <code> element. .It Dv LOWDOWN_DOC_HEADER A header with data gathered from document metadata (if configured). Described by the .Li <head> element. (Only if configured during parse.) .It Dv LOWDOWN_DOUBLE_EMPHASIS Bold (or otherwise notable) content. Described by the .Li <strong> element. .It Dv LOWDOWN_EMPHASIS Italic (or otherwise notable) content. Described by the .Li <em> element. .It Dv LOWDOWN_ENTITY An HTML entity, which may either be named or numeric. .It Dv LOWDOWN_FOOTNOTE A footnote. (Only if configured during parse.) .It Dv LOWDOWN_HEADER A block-level header. Described (in the HTML case) by one of .Li <h1> through .Li <h6> . .It Dv LOWDOWN_HIGHLIGHT Marked test. Described by the .Li <mark> element. (Only if configured during parse.) .It Dv LOWDOWN_HRULE A horizontal line. Described by .Li <hr> . .It Dv LOWDOWN_IMAGE An image. Described by the .Li <img> element. .It Dv LOWDOWN_LINEBREAK A hard line-break within a block context. Described by the .Li <br> element. .It Dv LOWDOWN_LINK A link to external media. Described by the .Li <a> element. .It Dv LOWDOWN_LINK_AUTO Like .Dv LOWDOWN_LINK , except inferred from text content. Described by the .Li <a> element. (Only if configured during parse.) .It Dv LOWDOWN_LIST A block-level list enclosure. Described by .Li <ul> or .Li <ol> . .It Dv LOWDOWN_LISTITEM A block-level list item, always appearing within a .Dv LOWDOWN_LIST . Described by .Li <li> . .It Dv LOWDOWN_MATH_BLOCK A block (or inline) of mathematical text in LaTeX format. Described within .Li \e[xx\e] or .Li \e(xx\e) . This is usually (in HTML) externally handled by a JavaScript renderer. (Only if configured during parse.) .It Dv LOWDOWN_META Meta-data keys and values. (Only if configured during parse.) These are described by elements in the .Li <head> element. .It Dv LOWDOWN_NORMAL_TEXT Normal text content. .It Dv LOWDOWN_PARAGRAPH A block-level paragraph. Described by the .Li <p> element. .It Dv LOWDOWN_RAW_HTML An inline of raw HTML. (Only if configured during parse.) .It Dv LOWDOWN_ROOT The root of the document. This is always the topmost node, and the only node where the .Va parent field is .Dv NULL . .It Dv LOWDOWN_STRIKETHROUGH Content struck through. Described by the .Li <del> element. (Only if configured during parse.) .It Dv LOWDOWN_SUPERSCRIPT A superscript. Described by the .Li <sup> element. (Only if configured during parse.) .It Dv LOWDOWN_TABLE_BLOCK A table block. Described by .Li <table> . (Only if configured during parse.) .It Dv LOWDOWN_TABLE_BODY A table body section. Described by .Li <tbody> . Parent is always .Dv LOWDOWN_TABLE_BLOCK . (Only if configured during parse.) .It Dv LOWDOWN_TABLE_CELL A table cell. Described by .Li <td> or .Li <th> if in the header. Parent is always .Dv LOWDOWN_TABLE_ROW . (Only if configured during parse.) .It Dv LOWDOWN_TABLE_HEADER A table header section. Described by .Li <thead> . Parent is always .Dv LOWDOWN_TABLE_BLOCK . (Only if configured during parse.) .It Dv LOWDOWN_TABLE_ROW A table row. Described by .Li <tr> . Parent is always .Dv LOWDOWN_TABLE_HEADER or .Dv LOWDOWN_TABLE_BODY . (Only if configured during parse.) .It Dv LOWDOWN_TRIPLE_EMPHASIS Combination of .Dv LOWDOWN_EMPHASIS and .Dv LOWDOWN_DOUBLE_EMPHASIS . .El .Pp The following anonymous union structures correspond to certain nodes. Note that all buffers may be zero-length. .Bl -tag -width Ds -offset indent .It Va rndr_autolink For .Dv LOWDOWN_LINK_AUTO , the link address as .Va link and the link type .Va type , which may be one of .Dv HALINK_EMAIL for e-mail links and .Dv HALINK_NORMAL otherwise. Any buffer may be empty-sized. .It Va rndr_blockcode For .Dv LOWDOWN_BLOCKCODE , the opaque .Va text of the block and the optional .Va lang of the code language. .It Va rndr_blockhtml For .Dv LOWDOWN_BLOCKHTML , the opaque HTML .Va text . .It Va rndr_codespan The opaque .Va text of the contents. .It Va rndr_definition For .Dv LOWDOWN_DEFINITION , containing .Va flags that may be .Dv HLIST_FL_BLOCK if the definition list should be interpreted as containing block elements. .It Va rndr_entity For .Dv LOWDOWN_ENTITY , the entity .Va text . .It Va rndr_header For .Dv LOWDOWN_HEADER , the .Va level of the header starting at zero (this value is relative to the metadata base header level, defaulting to one), optional space-separated class list .Va attr_cls , and optional single identifier .Va attr_id . .It Va rndr_image For .Dv LOWDOWN_IMAGE , the image address .Va link , the image title .Va title , dimensions NxN (width by height) in .Va dims , and alternate text .Va alt . CSS in-line style for width and height may be given in .Va attr_width and/or .Va attr_height , and a space-separated list of classes may be in .Va attr_cls and a single identifier may be in .Va attr_id . .It Va rndr_link Like .Va rndr_autolink , but without a type and further defining an optional link title .Va title , optional space-separated class list .Va attr_cls , and optional single identifier .Va attr_id . .It Va rndr_list For .Dv LOWDOWN_LIST , consists of a bitfield .Va flags that may be set to .Dv HLIST_FL_ORDERED for an ordered list and .Dv HLIST_FL_UNORDERED for an unordered one. If .Dv HLIST_FL_BLOCK is set, the list should be output as if items were separate blocks. The .Va start value for .Dv HLIST_FL_ORDERED is the starting list item position, which is one by default and never zero. .It Va rndr_listitem For .Dv LOWDOWN_LISTITEM , consists of a bitfield .Va flags that may be set to .Dv HLIST_FL_ORDERED for an ordered list, .Dv HLIST_FL_UNORDERED for an unordered list, .Dv HLIST_FL_DEF for definition list data, .Dv HLIST_FL_CHECKED or .Dv HLIST_FL_UNCHECKED for an unordered .Dq task list element, and/or .Dv HLIST_FL_BLOCK for list item output as if containing block elements. The .Dv HLIST_FL_BLOCK should not be used: use the parent list (or definition list) flags for this. The .Va num is the index in a .Dv HLIST_FL_ORDERED list. It is monotonically increasing with each item in the list, starting at the .Va start variable given in .Vt struct rndr_list . .It Va rndr_math For .Dv LOWDOWN_MATH , the mode of display in .Va blockmode : if 1, in-line math; if 2, multi-line. The opaque equation, which is assumed to be in LaTeX format, is in the opaque .Va text . .It Va rndr_meta Each .Dv LOWDOWN_META key-value pair is represented. The keys are lower-case without spaces or non-ASCII characters. If provided, enclosed nodes may consist only of .Dv LOWDOWN_NORMAL_TEXT and .Dv LOWDOWN_ENTITY . .It Va rndr_normal_text The basic .Va text content for .Dv LOWDOWN_NORMAL_TEXT . .It Va rndr_paragraph For .Dv LOWDOWN_PARAGRAPH , species how many .Va lines the paragraph has in the input file and .Va beoln , set to non-zero if the paragraph ends with an empty line instead of a breaking block element. .It Va rndr_raw_html For .Dv LOWDOWN_RAW_HTML , the opaque HTML .Va text . .It Va rndr_table For .Dv LOWDOWN_TABLE_BLOCK , the number of .Va columns in each row or header row. The number of columns in .Va rndr_table , .Va rndr_table_header , and .Va rndr_table_cell are the same. .It Va rndr_table_cell For .Dv LOWDOWN_TABLE_CELL , the current .Va col column number out of .Va columns . See .Va rndr_table_header for a description of the bits in .Va flags . The number of columns in .Va rndr_table , .Va rndr_table_header , and .Va rndr_table_cell are the same. .It Va rndr_table_header For .Dv LOWDOWN_TABLE_HEADER , the number of .Va columns in each row and the per-column .Va flags , which may tested for equality against .Dv HTBL_FL_ALIGN_LEFT , .Dv HTBL_FL_ALIGN_RIGHT , or .Dv HTBL_FL_ALIGN_CENTER after being masked with .Dv HTBL_FL_ALIGNMASK ; or .Dv HTBL_FL_HEADER . If no alignment is specified after the mask, the default should be left-aligned. The number of columns in .Va rndr_table , .Va rndr_table_header , and .Va rndr_table_cell are the same. .El .Sh SEE ALSO .Xr lowdown 1 , .Xr lowdown_buf 3 , .Xr lowdown_buf_diff 3 , .Xr lowdown_diff 3 , .Xr lowdown_doc_free 3 , .Xr lowdown_doc_new 3 , .Xr lowdown_doc_parse 3 , .Xr lowdown_file 3 , .Xr lowdown_file_diff 3 , .Xr lowdown_gemini_free 3 , .Xr lowdown_gemini_new 3 , .Xr lowdown_gemini_rndr 3 , .Xr lowdown_html_free 3 , .Xr lowdown_html_new 3 , .Xr lowdown_html_rndr 3 , .Xr lowdown_latex_free 3 , .Xr lowdown_latex_new 3 , .Xr lowdown_latex_rndr 3 , .Xr lowdown_metaq_free 3 , .Xr lowdown_nroff_free 3 , .Xr lowdown_nroff_new 3 , .Xr lowdown_nroff_rndr 3 , .Xr lowdown_odt_free 3 , .Xr lowdown_odt_new 3 , .Xr lowdown_odt_rndr 3 , .Xr lowdown_term_free 3 , .Xr lowdown_term_new 3 , .Xr lowdown_term_rndr 3 , .Xr lowdown_tree_rndr 3 , .Xr lowdown 5 .Sh AUTHORS .Nm lowdown was forked from .Lk https://github.com/hoedown/hoedown hoedown by .An Kristaps Dzonsons , .Mt kristaps@bsd.lv . It has been considerably modified since.