0.23.0

Breaking changes:

• Removed --no-inline CLI option and inline config option, inline options are now always enabled.
• Inline comments are now supposed to be only in short comments but not long ones.
• Installer script (install.lua) is removed. Luacheck can still be installed manually by recursively copying src/* to a directory in package.path and copying bin/luacheck.lua to a directory in PATH as luacheck.

New features and improvements:

• Warning columns are now reported in Unicode codepoints if input is valid UTF-8 (#45).
• Added indentaion-based guessing of a better location for missing end and until syntax errors.
• Added luacheckrc set of allowed globals containing globals used in Luacheck config to set options.
• Added default stds equivalent to predefined per-path std overrides in config:
  • files["**/spec/**/*_spec.lua"].std = "+busted";
  • files["**/test/**/*_spec.lua"].std = "+busted";
  • files["**/tests/**/*_spec.lua"].std = "+busted";
  • files["**/*.rockspec"].std = "+rockspec";
  • files["**/*.luacheckrc"].std = "+luacheckrc".
• Added detection of numeric for loops going from #t to 1 without negative step (#160).
• Added support for LuaRocks 3 module autodetection when checking rockspecs (#176).
• Updated love standard for LÖVE 11.1 (#178).

Changes:

• Default set of standard globals is now always max, allowing globals of all Lua versions. _G std is deprecated.

Fixes:

• Added missing globals to rockspec std: hooks, deploy, build_dependencies, test_dependencies, and test.
• Fixed line lengths appearing in the output before other warnings on the same line even if their column numbers are smaller.

Miscellaneous:

• Luacheck now depends on argparse instead of bundling it.
• LuaFileSystem dependency is now required.

0.22.1

Improvements:

• Reduced amount of RAM used when checking a large number of files.

0.22.0

New features and improvements:

• Added detection of cyclomatic complexity, with warnings emitted for
  functions with complexity higher than a configurable limit; disabled
  by default (#141).
• Added a built-in formatter printing warnings and errors in a format
  understood by MSBuild/Visual Studio if luacheck is
  used as a custom build step (#142).
• ranges and quiet options can now be used in config, e.g. quiet = 1 to
  disable OK lines in default formatter output.
• luacheck module now adds prev_line, prev_column, and prev_end_column
  fields to syntax error events if they refer to some extra location:
  redefined label errors point to the previous definition,
  unpaired tokens such as function/end point to the the first token (#134).
• luacheck module now adds prev_end_column field to warning events that
  already have prev_line and prev_column fields, and overwritten_end_column
  for warnings with overwritten_line and overwritten_column.
• Improved error messages for invalid options and config: when an option is
  invalid, extra context is provided instead of just the name.
• Custom stds are now validated on config load.
• When recursively checking a directory, each failure to list a nested
  directory is now reported separately, and other found files and directories
  are checked anyway. Previously any error when listing any nested directory
  resulted in immediate failure for the entire parent directory (#159).
• When --[no-]cache CLI option is used with LuaFileSystem not found,
  it is now ignored instead of causing an error. Missing LuaFileSystem is now
  mentioned in the help message next to features disabled without it.

Fixes:

• Fixed errors or incorrect reporting when unused mutually recursive functions
  have other values assigned to their local variables.
• Fixed unused values in infinite loops sometimes reported
  as overwritten by another value.
• Fixed caching not working properly when cache is enabled in config
  loaded from a parent directory.
• Fixed per-path config overrides not working on Windows when paths in config
  and input paths use different case (#150).
• Added missing definition of love.handlers to love std (#161).

Miscellaneous:

• Installer script (install.lua) is deprecated. Future versions of Luacheck
  may have required dependencies. Luacheck can still be installed manually
  by recursively copying src/luacheck to a directory in package.path
  and copying bin/luacheck.lua to a directory in PATH as luacheck.

0.21.2

Fixes:

• Fixed error when an upvalue is accessed from an unreachable closure (#139).
• Fixed unreachable code and accessing uninitialized variables not being detected inside unreachable functions.

0.21.1

Fixes:

• Added missing definition of ngx.ERROR constant to ngx_lua std (#123).
• Fixed unused values and initialized accesses not being reported when the access is in a closure defined in code path incompatible with the value assignment (#126).

0.21.0

New features and improvements:

• Column range for line is too long warning now starts at the first
  character beyond the length limit instead of the very first character
  of the line (#117).
• Error messages for invalid inline options are now a bit better, including
  reason why an inline option invocation is invalid and what is the name
  of the option at fault.
• ngx_lua std now contains full API definition for lua-nginx-module 0.10.10,
  so that operations on unknown fields within ngx global
  are now reported (#118).

Fixes:

• luacheck no longer aborts on internal error while checking files
  in parallel.

0.20.0

Breaking changes:

• luacheck now exits with 2 instead of 1 if there are syntax errors
  or invalid inline options present. It now exits with 3 instead of
  2 if I/O errors are present. It now exits with 4 instead of 3
  on a critical error (#94).

New features and improvements:

• If project-specific .luacheckrc is not found, luacheck will now use
  config from some global location if it is present there. Default global
  location is %LOCALAPPDATA%\Luacheck\.luacheckrc on Windows,
  ~/Library/Application Support/Luacheck/.luacheckrc on OS X/macOS, and
  $XDG_CONFIG_HOME/luacheck/.luacheckrc or ~/.config/luacheck/.luacheckrc
  on other systems. This behaviour can be tweaked with --default-config and
  --no-default-config options (#102).
• New --[no-]max-code-line-length, --[no-]max-string-line-length,
  --[no-]max-comment-line-length CLI options and corresponding
  config and inline options that limit line length only for subsets of lines
  based on line type: string lines have their line endings within a string,
  comment lines have their line endings within a comment, other lines
  are code lines (#100).
• New love std set containing globals added by Love2D framework (#108).
• For warnings about unused values and fields, if the value is always
  overwritten by a single other value, location of the overwriting
  assignment is mentioned in the warning message (#106).
• When attempting to check a directory while LuaFileSystem is not installed,
  luacheck now mentions that LuaFileSystem is required in the error
  message (#103).
• Improved warning message for unbalanced assignment warnings (#104).

0.19.1

Miscellaneous:

• Added warning code for line is too long warnings to documentation.
• Added binary executable file for Windows.

0.19.0

Breaking changes:

• New format for defining standard sets of globals that can
  describe all allowed fields of each global.

New features and improvements:

• Luacheck can now detect mutations and accesses of specific fields
  within globals. Standard global definitions have been updated
  to provide precise lists of allowed fields. This also
  works through local aliases (e.g. local t = table; t.upsert()
  produces a warning, but local t = table; t.insert() does not).
• Default set of allowed globals is now equal to globals normally
  provided by version of Lua used to run Luacheck, instead of
  all globals set in the interpreter while it runs Luacheck.
• All options that operate on lists of global names can now use
  field names as well. E.g. --not-globals string.len undefines
  standard field string.len. Additionally, config options
  globals, new_globals, read_globals, new_read_globals
  can use a table-based format to define trees of allowed fields.
• Lines that are longer than some maximum length are now reported.
  Default limit is 120. Limit can be changed using max_line_length
  option.
• Warnings related to trailing whitespace in comments
  and inside string literals now use separate warning codes.
• Luacheck no longer reports a crash with a long traceback when
  interrupted, instead it simply exits with an error message.

Fixes:

• Fixes inconsistent indentation not being detected on lines
  with trailing whitespace.

0.18.0

New features and improvements:

• Indirect mutations of read-only globals through local aliases
  are now detected (e.g. local t = table; t.foo = "bar").
• New CLI, config, and inline option not_globals for removing
  defined standard and custom globals (#88).
• Custom globals defined as mutable using globals option
  can now be set to read-only using read_globals option
  in overwriting settings (previously globals had priority
  over read_globals even if read_globals was the last
  option used).
• Luacheck exit codes are now documented.

Fixes:

• Warnings that are explictly enabled by inline options are
  now correctly reported. E.g. --luacheck: std none now
  results in warnings for any used globals (#51).