cmark 0.23

• [API change] Added CUSTOM_BLOCK and CUSTOM_INLINE node types.
  They are never generated by the parser, and do not correspond
  to CommonMark elements. They are designed to be inserted by
  filters that postprocess the AST. For example, a filter might
  convert specially marked code blocks to svg diagrams in HTML
  and tikz diagrams in LaTeX, passing these through to the renderer
  as a CUSTOM_BLOCK. These nodes can have children, but they
  also have literal text to be printed by the renderer "on enter"
  and "on exit." Added cmark_node_get_on_enter,
  cmark_node_set_on_enter, cmark_node_get_on_exit,
  cmark_node_set_on_exit to API.
• [API change] Rename NODE_HTML -> NODE_HTML_BLOCK,
  NODE_INLINE_HTML -> NODE_HTML_INLINE. Define aliases
  so the old names still work, for backwards compatibility.
• [API change] Rename CMARK_NODE_HEADER -> CMARK_NODE_HEADING.
  Note that for backwards compatibility, we have defined aliases:
  CMARK_NODE_HEADER = CMARK_NODE_HEADING,
  cmark_node_get_header_level = cmark_node_get_heading_level, and
  cmark_node_set_header_level = cmark_node_set_heading_level.
• [API change] Rename CMARK_NODE_HRULE -> CMARK_NODE_THEMATIC_BREAK.
  Defined the former as the latter for backwards compatibility.
• Don't allow space between link text and link label in a reference link
  (spec change).
• Separate parsing and rendering opts in cmark.h (#88).
  This change also changes some of these constants' numerical values,
  but nothing should change in the API if you use the constants
  themselves. It should now be clear in the man page which
  options affect parsing and which affect rendering.
• xml renderer - Added xmlns attribute to document node (commonmark/commonmark-spec#87).
• Commonmark renderer: ensure html blocks surrounded by blanks.
  Otherwise we get failures of roundtrip tests.
• Commonmark renderer: ensure that literal characters get escaped
  when they're at the beginning of a block, e.g. > \- foo.
• LaTeX renderer - better handling of internal links.
  Now we render [foo](#bar) as \protect\hyperlink{bar}{foo}.
• Check for NULL pointer in _scan_at (#81).
• Makefile.nmake: be more robust when cmake is missing. Previously,
  when cmake was missing, the build dir would be created anyway, and
  subsequent attempts (even with cmake) would fail, because cmake would
  not be run. Depending on build/CMakeFiles is more robust -- this won't
  be created unless cmake is run. Partially addresses #85.
• Fixed DOCTYPE in xml output.
• commonmark.c: fix size_t to int. This fixes an MSVC warning
  "conversion from 'size_t' to 'int', possible loss of data" (Kevin Wojniak).
• Correct string length in cmark_parse_document example (Lee Jeffery).
• Fix non-ASCII end-of-line character check (andyuhnak).
• Fix "declaration shadows a local variable" (Kevin Wojniak).
• Install static library (commonmark/commonmark-spec#381).
• Fix warnings about dropping const qualifier (Kevin Wojniak).
• Use full (unabbreviated) versions of constants (CMARK_...).
• Removed outdated targets from Makefile.
• Removed need for sudo in make bench.
• Improved benchmark. Use longer test, since time has limited resolution.
• Removed bench.h and timing calls in main.c.
• Updated API docs; getters return empty strings if not set
  rather than NULL, as previously documented.
• Added api_tests for custom nodes.
• Made roundtrip test part of the test suite run by cmake.
• Regenerate scanners.c using re2c 0.15.3.
• Adjusted scanner for link url. This fixes a heap buffer overflow (#82).
• Added version number (1.0) to XML namespace. We don't guarantee
  stability in this until 1.0 is actually released, however.
• Removed obsolete TIMER macro.
• Make LIB_INSTALL_DIR configurable (Mathieu Bridon, #79).
• Removed out-of-date luajit wrapper.
• Use input, not parser->curline to determine last line length.
• Small optimizations in _scan_at.
• Replaced hard-coded 4 with TAB_STOP.
• Have make format reformat api tests as well.
• Added api tests for man, latex, commonmark, and xml renderers (#51).
• render.c: added begin_content field. This is like begin_line except
  that it doesn't trigger production of the prefix. So it can be set
  after an initial prefix (say >) is printed by the renderer, and
  consulted in determining whether to escape content that has a special
  meaning at the beginning of a line. Used in the commonmark renderer.
• Python 3.5 compatibility: don't require HTMLParseError (Zhiming Wang).
  HTMLParseError was removed in Python 3.5. Since it could never be thrown
  in Python 3.5+, we simply define a placeholder when HTMLParseError
  cannot be imported.
• Set convert_charrefs=False in normalize.py (#83). This defeats the
  new default as of python 3.5, and allows the script to work with python
  3.5.

cmark 0.22.0

• Removed pre from blocktags scanner. pre is handled separately
  in rule 1 and needn't be handled in rule 6.
• Added iframe to list of blocktags, as per spec change.
• Fixed bug with HRULE after blank line. This previously caused cmark
  to break out of a list, thinking it had two consecutive blanks.
• Check for empty string before trying to look at line ending.
• Make sure every line fed to S_process_line ends with \n (#72).
  So S_process_line sees only unix style line endings. Ultimately we
  probably want a better solution, allowing the line ending style of
  the input file to be preserved. This solution forces output with newlines.
• Improved cmark_strbuf_normalize_whitespace (#73). Now all characters
  that satisfy cmark_isspace are recognized as whitespace. Previously
  \r and \t (and others) weren't included.
• Treat line ending with EOF as ending with newline (#71).
• Fixed --hardbreaks with \r\n line breaks (#68).
• Disallow list item starting with multiple blank lines (commonmark/commonmark-spec#332).
• Allow tabs before closing #s in ATX header
• Removed cmark_strbuf_printf and cmark_strbuf_vprintf.
  These are no longer needed, and cause complications for MSVC.
  Also removed HAVE_VA_COPY and HAVE_C99_SNPRINTF feature tests.
• Added option to disable tests (Kevin Wojniak).
• Added CMARK_INLINE macro.
• Removed need to disable MSVC warnings 4267, 4244, 4800
  (Kevin Wojniak).
• Fixed MSVC inline errors when cmark is included in sources that
  don't have the same set of disabled warnings (Kevin Wojniak).
• Fix FileNotFoundError errors on tests when cmark is built from
  another project via add_subdirectory() (Kevin Wojniak).
• Prefix utf8proc functions to avoid conflict with existing library
  (Kevin Wojniak).
• Avoid name clash between Windows .pdb files (Nick Wellnhofer).
• Improved smart_punct.txt (see commonmark/commonmark.js#61).
• Set POSITION_INDEPENDENT_CODE ON for static library (see #39).
• make bench: allow overriding BENCHFILE. Previously if you did
  this, it would clopper BENCHFILE with the default bench file.
• make bench: Use -10 priority with renice.
• Improved make_autolink. Ensures that title is chunk with empty
  string rather than NULL, as with other links.
• Added clang-check target.
• Travis: split roundtrip_test and leakcheck (OGINO Masanori).
• Use clang-format, llvm style, for formatting. Reformatted all source files.
  Added format target to Makefile. Removed astyle target.
  Updated .editorconfig.

cmark 0.21.0

• Updated to version 0.21 of spec.
• Added latex renderer (#31). New exported function in API:
  cmark_render_latex. New source file: src/latex.hs.
• Updates for new HTML block spec. Removed old html_block_tag scanner.
  Added new html_block_start and html_block_start_7, as well
  as html_block_end_n for n = 1-5. Rewrote block parser for new HTML
  block spec.
• We no longer preprocess tabs to spaces before parsing.
  Instead, we keep track of both the byte offset and
  the (virtual) column as we parse block starts.
  This allows us to handle tabs without converting
  to spaces first. Tabs are left as tabs in the output, as
  per the revised spec.
• Removed utf8 validation by default. We now replace null characters
  in the line splitting code.
• Added CMARK_OPT_VALIDATE_UTF8 option and command-line option
  --validate-utf8. This option causes cmark to check for valid
  UTF-8, replacing invalid sequences with the replacement
  character, U+FFFD. Previously this was done by default in
  connection with tab expansion, but we no longer do it by
  default with the new tab treatment. (Many applications will
  know that the input is valid UTF-8, so validation will not
  be necessary.)
• Added CMARK_OPT_SAFE option and --safe command-line flag.
  • Added CMARK_OPT_SAFE. This option disables rendering of raw HTML
    and potentially dangerous links.
  • Added --safe option in command-line program.
  • Updated cmark.3 man page.
  • Added scan_dangerous_url to scanners.
  • In HTML, suppress rendering of raw HTML and potentially dangerous
    links if CMARK_OPT_SAFE. Dangerous URLs are those that begin
    with javascript:, vbscript:, file:, or data: (except for
    image/png, image/gif, image/jpeg, or image/webp mime types).
  • Added api_test for OPT_CMARK_SAFE.
  • Rewrote README.md on security.
• Limit ordered list start to 9 digits, per spec.
• Added width parameter to render_man (API change).
• Extracted common renderer code from latex, man, and commonmark
  renderers into a separate module, renderer.[ch] (#63). To write a
  renderer now, you only need to write a character escaping function
  and a node rendering function. You pass these to cmark_render
  and it handles all the plumbing (including line wrapping) for you.
  So far this is an internal module, but we might consider adding
  it to the API in the future.
• commonmark writer: correctly handle email autolinks.
• commonmark writer: escape !.
• Fixed soft breaks in commonmark renderer.
• Fixed scanner for link url. re2c returns the longest match, so we
  were getting bad results with [link](foo\(and\(bar\)\))
  which it would parse as containing a bare \ followed by
  an in-parens chunk ending with the final paren.
• Allow non-initial hyphens in html tag names. This allows for
  custom tags, see commonmark/commonmark-spec#239.
• Updated test/smart_punct.txt.
• Implemented new treatment of hyphens with --smart, converting
  sequences of hyphens to sequences of em and en dashes that contain no
  hyphens.
• HTML renderer: properly split info on first space char (see
  commonmark/commonmark.js#54).
• Changed version variables to functions (#60, Andrius Bentkus).
  This is easier to access using ffi, since some languages, like C#
  like to use only function interfaces for accessing library
  functionality.
• process_emphasis: Fixed setting lower bound to potential openers.
  Renamed potential_openers -> openers_bottom.
  Renamed start_delim -> stack_bottom.
• Added case for #59 to pathological_test.py.
• Fixed emphasis/link parsing bug (#59).
• Fixed off-by-one error in line splitting routine.
  This caused certain NULLs not to be replaced.
• Don't rtrim in subject_from_buffer. This gives bad results in
  parsing reference links, where we might have trailing blanks
  (finalize removes the bytes parsed as a reference definition;
  before this change, some blank bytes might remain on the line).
  • Added column and first_nonspace_column fields to parser.
  • Added utility function to advance the offset, computing
    the virtual column too. Note that we don't need to deal with
    UTF-8 here at all. Only ASCII occurs in block starts.
  • Significant performance improvement due to the fact that
    we're not doing UTF-8 validation.
• Fixed entity lookup table. The old one had many errors.
  The new one is derived from the list in the npm entities package.
  Since the sequences can now be longer (multi-code-point), we
  have bumped the length limit from 4 to 8, which also affects
  houdini_html_u.c. An example of the kind of error that was fixed:
  ≧̸ should be rendered as "≧̸" (U+02267 U+00338), but it was
  being rendered as "≧" (which is the same as ≧).
• Replace gperf-based entity lookup with binary tree lookup.
  The primary advantage is a big reduction in the size of
  the compiled library and executable (> 100K).
  There should be no measurable performance difference in
  normal documents. I detected only a slight performance
  hit in a file containing 1,000,000 entities.
  • Removed src/html_unescape.gperf and src/html_unescape.h.
  • Added src/entities.h (generated by tools/make_entities_h.py).
  • Added binary tree lookup functions to houdini_html_u.c, and
    use the data in src/entities.h.
  • Renamed entities.h -> entities.inc, and
    tools/make_entities_h.py -> tools/make_entitis_inc.py.
• Fixed cases like
  [ref]: url "title" ok
  Here we should parse the first line as a reference.
• inlines.c: Added utility functions to skip spaces and line endings.
• Fixed backslashes in link destinations that are not part of escapes
  (commonmark/commonmark-spec#45).
• process_line: Removed "add newline if line doesn't have one."
  This isn't actually needed.
• Small logic fixes and a simplification in process_emphasis.
• Added more pathological tests:
  • Many link closers with no openers.
  • Many link openers with no closers.
  • Many emph openers with no closers.
  • Many closers with no openers.
  • "*a_ " * 20000.
• Fixed process_emphasis to handle new pathological cases.
  Now we have an array of pointers (potential_openers),
  keyed to the delim char. When we've failed to match a potential opener
  prior to point X in the delimiter stack, we reset potential_openers
  for that opener type to X, and thus avoid having to look again through
  all the openers we've already rejected.
• process_inlines: remove closers from delim stack when possible.
  When they have no matching openers and cannot be openers themselves,
  we can safely remove them. This helps with a performance case:
  "a_ " * 20000 (commonmark/commonmark.js#43).
• Roll utf8proc_charlen into utf8proc_valid (Nick Wellnhofer).
  Speeds up "make bench" by another percent.
• spec_tests.py: allow → for tab in HTML examples.
• normalize.py: don't collapse whitespace in pre contexts.
• Use utf-8 aware re2c.
• Makefile afl target: removed -m none, added CMARK_OPTS.
• README: added make afl instructions.
• Limit generated generated cmark.3 to 72 character line width.
• Travis: switched to containerized build system.
• Removed debug.h. (It uses GNU extensions, and we don't need it anyway.)
• Removed sundown from benchmarks, because the reading was anomalous.
  sundown had an arbitrary 16MB limit on buffers, and the benchmark
  input exceeded that. So who knows what we were actually testing?
  Added hoedown, sundown's successor, which is a better comparison.

cmark 0.20.0

• Fixed bug in list item parsing when items indented >= 4 spaces (#52).
• Don't allow link labels with no non-whitespace characters
  (commonmark/commonmark-spec#322).
• Fixed multiple issues with numeric entities (#33, Nick Wellnhofer).
• Support CR and CRLF line endings (Ben Trask).
• Added test for different line endings to api_test.
• Allow NULL value in string setters (Nick Wellnhofer). (NULL
  produces a 0-length string value.) Internally, URL and
  title are now stored as cmark_chunk rather than char *.
• Fixed memory leak in cmark_consolidate_text_nodes (#32).
• Fixed is_autolink in the CommonMark renderer (#50). Previously any
  link with an absolute URL was treated as an autolink.
• Cope with broken snprintf on Windows (Nick Wellnhofer). On Windows,
  snprintf returns -1 if the output was truncated. Fall back to
  Windows-specific _scprintf.
• Switched length parameter on cmark_markdown_to_html,
  cmark_parser_feed, and cmark_parse_document from int
  to size_t (#53, Nick Wellnhofer).
• Use a custom type bufsize_t for all string sizes and indices.
  This allows to switch to 64-bit string buffers by changing a single
  typedef and a macro definition (Nick Wellnhofer).
• Hardened the strbuf code, checking for integer overflows and
  adding range checks (Nick Wellnhofer).
• Removed unused function cmark_strbuf_attach (Nick Wellnhofer).
• Fixed all implicit 64-bit to 32-bit conversions that
  -Wshorten-64-to-32 warns about (Nick Wellnhofer).
• Added helper function cmark_strbuf_safe_strlen that converts
  from size_t to bufsize_t and throws an error in case of
  an overflow (Nick Wellnhofer).
• Abort on strbuf out of memory errors (Nick Wellnhofer).
  Previously such errors were not being trapped. This involves
  some internal changes to the buffer library that do not affect
  the API.
• Factored out S_find_first_nonspace in S_proces_line.
  Added fields offset, first_nonspace, indent, and blank
  to cmark_parser struct. This just removes some repetition.
• Added Racket Racket (5.3+) wrapper (Eli Barzilay).
• Removed -pg from Debug build flags (#47).
• Added Ubsan build target, to check for undefined behavior.
• Improved make leakcheck. We now return an error status if anything
  in the loop fails. We now check --smart and --normalize options.
• Removed wrapper3.py, made wrapper.py work with python 2 and 3.
  Also improved the wrapper to work with Windows, and to use smart
  punctuation (as an example).
• In wrapper.rb, added argument for options.
• Revised luajit wrapper.
• Added build status badges to README.md.
• Added links to go, perl, ruby, R, and Haskell bindings to README.md.

cmark 0.19.0

• Fixed _ emphasis parsing to conform to spec (commonmark/commonmark-spec#317).
• Updated spec.txt.
• Compile static library with -DCMARK_STATIC_DEFINE (Nick Wellnhofer).
• Suppress warnings about Windows runtime library files (Nick Wellnhofer). Visual Studio Express editions do not include the redistributable files. Set CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS_NO_WARNINGS to suppress warnings.
• Added appyeyor: Windows continuous integration (appveyor.yml).
• Use os.path.join in test/cmark.py for proper cross-platform paths.
• Fixed Makefile.nmake.
• Improved make afl: added test/afl_dictionary, increased timeout for hangs.
• Improved README with a description of the library's strengths.
• Pass-through Unicode non-characters (Nick Wellnhofer). Despite their name, Unicode non-characters are valid code points. They should be passed through by a library like libcmark.
• Check return status of utf8proc_iterate (#27).

cmark 0.18.3

• Include patch level in soname (Nick Wellnhofer). Minor version is tied to spec version, so this allows breaking the ABI between spec releases.
• Install compiler-provided system runtime libraries (Changjiang Yang).
• Use strbuf_printf instead of snprintf. snprintf is not available on some platforms (Visual Studio 2013 and earlier).
• Fixed memory access bug: "invalid read of size 1" on input [link](<>).

cmark 0.18.2

• Added commonmark renderer: cmark_render_commonmark. In addition to options, this takes a width parameter. A value of 0 disables wrapping; a positive value wraps the document to the specified width. Note that width is automatically set to 0 if the CMARK_OPT_HARDBREAKS option is set.
• The cmark executable now allows -t commonmark for output as CommonMark. A --width option has been added to specify wrapping width.
• Added roundtrip_test Makefile target. This runs all the spec through the commonmark renderer, and then through the commonmark parser, and compares normalized HTML to the test. All tests pass with the current parser and renderer, giving us some confidence that the commonmark renderer is sufficiently robust. Eventually this should be pythonized and put in the cmake test routine.
• Removed an unnecessary check in blocks.c. By the time we check for a list start, we've already checked for a horizontal rule, so we don't need to repeat that check here. Thanks to Robin Stocker for pointing out a similar redundancy in commonmark.js.
• Fixed bug in cmark_strbuf_unescape (buffer.c). The old function gave incorrect results on input like \\*, since the next backslash would be treated as escaping the * instead of being escaped itself.
• scanners.re: added _scan_scheme, scan_scheme, used in the commonmark renderer.
• Check for CMAKE_C_COMPILER (not CC_COMPILER) when setting C flags.
• Update code examples in documentation, adding new parser option argument, and using CMARK_OPT_DEFAULT (Nick Wellnhofer).
• Added options parameter to cmark_markdown_to_html.
• Removed obsolete reference to CMARK_NODE_LINK_LABEL.
• make leakcheck now checks all output formats.
• test/cmark.py: set default options for markdown_to_html.
• Warn about buggy re2c versions (Nick Wellnhofer).

cmark 0.18.1

• Build static version of library in default build (#11).
• cmark.h: Add missing argument to cmark_parser_new (#12).

cmark 0.18

• Switch to 2-clause BSD license, with agreement of contributors.
• Added Profile build type, make prof target.
• Fixed autolink scanner to conform to the spec. Backslash escapes
  not allowed in autolinks.
• Don't rely on strnlen being available (Nick Wellnhofer).
• Updated scanners for new whitespace definition.
• Added CMARK_OPT_SMART and --smart option, smart.c, smart.h.
• Added test for --smart option.
• Fixed segfault with --normalize (closes #7).
• Moved normalization step from XML renderer to cmark_parser_finish.
• Added options parameter to cmark_parse_document, cmark_parse_file.
• Fixed man renderer's escaping for unicode characters.
• Don't require python3 to make cmark.3 man page.
• Use ASCII escapes for punctuation characters for portability.
• Made options an int rather than a long, for consistency.
• Packed cmark_node struct to fit into 128 bytes.
  This gives a small performance boost and lowers memory usage.
• Repacked delimiter struct to avoid hole.
• Fixed use-after-free bug, which arose when a paragraph containing
  only reference links and blank space was finalized (#9).
  Avoid using parser->current in the loop that creates new
  blocks, since finalize in add_child may have removed
  the current parser (if it contains only reference definitions).
  This isn't a great solution; in the long run we need to rewrite
  to make the logic clearer and to make it harder to make
  mistakes like this one.
• Added 'Asan' build type. make asan will link against ASan; the
  resulting executable will do checks for memory access issues.
  Thanks @JordanMilne for the suggestion.
• Add Makefile target to fuzz with AFL (Nick Wellnhofer)
  The variable $AFL_PATH must point to the directory containing the AFL
  binaries. It can be set as an environment variable or passed to make on
  the command line.

cmark 0.17

• Stripped out all JavaScript related code and documentation, moving it to a separate repository (https://github.com/jgm/commonmark.js).
• Improved Makefile targets, so that cmake is run again only when necessary (Nick Wellnhofer).
• Added INSTALL_PREFIX to the Makefile, allowing installation to a location other than /usr/local without invoking cmake manually (Nick Wellnhofer).
• make test now guarantees that the project will be rebuilt before tests are run (Nick Wellnhofer).
• Prohibited overriding of some Makefile variables (Nick Wellnhofer).
• Provide version number and string, both as macros (CMARK_VERSION, CMARK_VERSION_STRING) and as symbols (cmark_version, cmark_version_string) (Nick Wellnhofer). All of these come from cmark_version.h, which is constructed from a template cmark_version.h.in and data in CMakeLists.txt.
• Avoid calling free on null pointer.
• Added an accessor for an iterator's root node (cmark_iter_get_root).
• Added user data field for nodes (Nick Wellnhofer). This is intended mainly for use in bindings for dynamic languages, where it could store a pointer to a target language object (#287). But it can be used for anything.
• Man renderer: properly escape multiline strings.
• Added assertion to raise error if finalize is called on a closed block.
• Implemented the new spec rule for emphasis and strong emphasis with _.
• Moved the check for fence-close with the other checks for end-of-block.
• Fixed a bug with loose list detection with items containings fenced code blocks (#285).
• Removed recursive algorithm in ends_with_blank_line (#286).
• Minor code reformatting: renamed parameters.