CHANGELOG.md

Changelog

[Unreleased]

This is the first stable release as a proper module, now under mvdan.cc/sh/v3/.... Go 1.12 or later is supported.

A large number of changes have been done since the last feature release a year ago. All users are encouraged to update. Below are the major highlights.

• cmd/shfmt
  • Support for EditorConfig files
  • Drop the dependency on diff for the -d flag, now using pure Go
• syntax
  • Overhaul escaped newlines, now represented as WordPart positions
  • Improve some operator type names, to consistently convey meaning
  • Completely remove StmtList
  • Redesign IfClause, making its "else" another IfClause node
  • Redesign DeclClause to remove its broken Opts field
  • Brace expression parsing is now done with a BraceExp word part
  • Improve comment alignment in Printer via a post-process step
  • Add support for the ~ bitwise negation operator
  • Record the use of deprecated tokens in the syntax tree
• interp
  • Improve the module API as "handlers", to reduce confusion with Go modules
  • Split LookPath out of ExecHandler to allow custom behavior
  • Run now returns nil instead of ShellExitStatus(0)
• expand
  • Redesign Variable to reduce allocations
  • Add support for more escape sequences
  • Make Config a bit more powerful via func fields
  • Rework brace expansion via the new BraceExp word part
• pattern
  • New package for shell pattern matching, extracted from syntax
  • Add support for multiple modes, including filenames and braces

Special thanks to Konstantin Kulikov for his contribution to this release.

2.6.4 - 2019-03-10

• syntax
  • Support array elements without values, like declare -A x=([index]=)
  • Parse for i; do ... uniquely, as it's short for for i in "$@"
  • Add missing error on unclosed nested backquotes
• expand
  • Don't expand tildes twice, fixing echo ~ on Windows
• interp
  • Fix the use of Params as an option to New
  • Support lowercase Windows volume names in $PATH

2.6.3 - 2019-01-19

• expand
  • Support globs with path prefixes and suffixes, like ./foo/*/
  • Don't error when skipping non-directories in glob walks

2.6.2 - 2018-12-08

• syntax
  • Avoid premature reads in Parser.Interactive when parsing Unicode bytes
  • Fix parsing of certain Bash test expression involving newlines
  • Redirect.End now takes the Hdoc field into account
  • ValidName now returns false for an empty string
• expand
  • Environment variables on Windows are case insensitive again
• interp
  • Don't crash on declare $unset=foo
  • Fix a regression where executed programs would receive a broken environment

Note that the published Docker image was changed to set shfmt as the entrypoint, so previous uses with arguments like docker run mvdan/shfmt:v2.6.1 shfmt --version should now be docker run mvdan/shfmt:v2.6.2 --version.

2.6.1 - 2018-11-17

• syntax
  • Fix Parser.Incomplete with some incomplete literals
  • Fix parsing of Bash regex tests in some edge cases
• interp
  • Add support for $(<file) special command substitutions

2.6.0 - 2018-11-10

This is the biggest v2 release to date. It's now possible to write an interactive shell, and it's easier and safer to perform shell expansions.

This will be the last major v2 version, to allow converting the project to a Go module in v3.

• Go 1.10 or later required to build
• syntax
  • Add Parser.Interactive to implement an interactive shell
  • Add Parser.Document to parse a single here-document body
  • Add Parser.Words to incrementally parse separate words
  • Add the Word.Lit helper method
  • Support custom indentation in <<- heredoc bodies
• interp
  • Stabilize API and add some examples
  • Introduce a constructor, and redesign Runner.Reset
  • Move the context from a field to function parameters
  • Remove Runner.Stmt in favor of Run with ShellExitStatus
• shell
  • Stabilize API and add some examples
  • Add Expand, as a more powerful os.Expand
  • Add Fields, similar to the old Runner.Fields
  • Source* functions now take a context
  • Source* functions no longer try to sandbox
• expand
  • New package, split from interp
  • Allows performing shell expansions in a controlled way
  • Redesigned Environ and Variable moved from interp

2.5.1 - 2018-08-03

• syntax
  • Fix a regression where semicolons would disappear within switch cases

2.5.0 - 2018-07-13

• syntax
  • Add support for Bash's {varname}< redirects
  • Add SpaceRedirects to format redirects like > word
  • Parse $\" correctly within double quotes
  • A few fixes where minification would break programs
  • Printing of heredocs within <() no longer breaks them
  • Printing of single statements no longer adds empty lines
  • Error on invalid parameter names like ${1a}
• interp
  • Runner.Dir is now always an absolute path
• shell
  • Expand now supports expanding a lone ~
  • Expand and SourceNode now have default timeouts
• cmd/shfmt
  • Add -sr to print spaces after redirect operators
  • Don't skip empty string values in -tojson
  • Include comment positions in -tojson

2.4.0 - 2018-05-16

• Publish as a JS package, mvdan-sh
• syntax
  • Add DebugPrint to pretty-print a syntax tree
  • Fix comment parsing and printing in some edge cases
  • Indent <<- heredoc bodies if indenting with tabs
  • Add support for nested backquotes
  • Relax parser to allow quotes in arithmetic expressions
  • Don't rewrite declare foo= into declare foo
• interp
  • Add support for shopt -s globstar
  • Replace Runner.Env with an interface
• shell
  • Add Expand as a fully featured version of os.Expand
• cmd/shfmt
  • Set appropriate exit status when -d is used

2.3.0 - 2018-03-07

• syntax
  • Case clause patterns are no longer forced on a single line
  • Add ExpandBraces, to perform Bash brace expansion on words
  • Improve the handling of backslashes within backquotes
  • Improve the parsing of Bash test regexes
• interp
  • Support $DIRSTACK, ${param[@]#word}, and ${param,word}
• cmd/shfmt
  • Add -d, to display diffs when formatting differs
  • Promote -exp.tojson to -tojson
  • Add Pos and End fields to nodes in -tojson
  • Inline StmtList fields to simplify the -tojson output
  • Support -l on standard input

2.2.1 - 2018-01-25

• syntax
  • Don't error on ${1:-default}
  • Allow single quotes in ${x['str key']} as well as double quotes
  • Add support for ${!foo[@]}
  • Don't simplify foo[$x] to foo[x], to not break string indexes
  • Fix Stmt.End when the end token is the background operator &
  • Never apply the negation operator ! to && and || lists
  • Apply the background operator & to entire && and || lists
  • Fix StopAt when the stop string is at the beginning of the source
  • In N>word, check that N is a valid numeric literal
  • Fix a couple of crashers found via fuzzing
• cmd/shfmt
  • Don't error if non-bash files can't be written to

2.2.0 - 2018-01-18

• Tests on Mac and Windows are now ran as part of CI
• syntax
  • Add StopAt to stop lexing at a custom arbitrary token
  • Add TranslatePattern and QuotePattern for pattern matching
  • Minification support added to the printer - see Minify
  • Add ParamExp.Names to represent ${!prefix*}
  • Add TimeClause.PosixFormat for its -p flag
  • Fix parsing of assignment values containing =
  • Fix parsing of parameter expansions followed by a backslash
  • Fix quotes in parameter expansion operators like ${v:-'def'}
  • Fix parsing of negated declare attributes like declare +x name
  • Fix parsing of ${#@}
  • Reject bad parameter expansion operators like ${v@WRONG}
  • Reject inline array variables like a=(b c) prog
  • Reject indexing of special vars like ${1[3]}
  • Reject ${!name} when in POSIX mode
  • Reject multiple parameter expansion actions like ${#v:-def}
• interp
  • Add Bash brace expansion support, including {a,b} and {x..y}
  • Pattern matching actions are more correct and precise
  • Exported some Runner internals, including Vars and Funcs
  • Use the interpreter's $PATH to find binaries
  • Roll our own globbing to use our own pattern matching code
  • Support the getopts sh builtin
  • Support the read bash builtin
  • Numerous changes to improve Windows support
• shell
  • New experimental package with high-level utility functions
  • Add SourceFile to get the variables declared in a script
  • Add SourceNode as a lower-level version of the above
• cmd/shfmt
  • Add -mn, which minifies programs via syntax.Minify

2.1.0 - 2017-11-25

• syntax
  • Add Stmts, to parse one statement at a time
  • Walk no longer ignores comments
  • Parameter expansion end fixes, such as $foo.bar
  • Whitespace alignment can now be kept - see KeepPadding
  • Introduce an internal newline token to simplify the parser
  • Fix Block.Pos to actually return the start position
  • Fix mishandling of inline comments in two edge cases
• interp
  • Expose Fields to expand words into strings
  • First configurable modules - cmds and files
  • Add support for the new TimeClause
  • Add support for namerefs and readonly vars
  • Add support for associative arrays (maps)
  • More sh builtins: exec return
  • More bash builtins: command pushd popd dirs
  • More test operators: -b -c -t -o
  • Configurable kill handling - see KillTimeout
• cmd/shfmt
  • Add -f to just list all the shell files found
  • Add -kp to keep the column offsets in place
• cmd/gosh
  • Now supports a basic interactive mode

2.0.0 - 2017-08-30

• The package import paths were moved to mvdan.cc/sh/...
• syntax
  • Parser and Printer structs introduced with functional options
  • Node positions are now independent - Position merged into Pos
  • All comments are now attached to nodes
  • Support mksh - MirBSD's Korn Shell, used in Android
  • Various changes to the AST:
    • EvalClause removed; eval is no longer parsed as a keyword
    • Add support for Bash's time and select
    • Merge UntilClause into WhileClause
    • Moved Stmt.Assigns to CallExpr.Assigns
    • Remove Elif - chain IfClause nodes instead
  • Support for indexed assignments like a[i]=b
  • Allow expansions in arithmetic expressions again
  • Unclosed heredocs now produce an error
  • Binary ops are kept in the same line - see BinaryNextLine
  • Switch cases are not indented by default - see SwitchCaseIndent
• cmd/shfmt
  • Add -s, which simplifies programs via syntax.Simplify
  • Add -ln <lang>, like -ln mksh
  • Add -bn to put binary ops in the next line, like in v1
  • Add -ci to indent switch cases, like in v1
• interp
  • Some progress made, though still experimental
  • Most of POSIX done - some builtins remain to be done

1.3.1 - 2017-05-26

• syntax
  • Fix parsing of ${foo[$bar]}
  • Fix printer regression where > >(foo) would be turned into >>(foo)
  • Break comment alignment on any line without a comment, fixing formatting issues
  • Error on keywords like fi and done used as commands

1.3.0 - 2017-04-24

• syntax
  • Fix backslashes in backquote command substitutions
  • Disallow some test expressions like [[ a == ! b ]]
  • Disallow some parameter expansions like ${$foo}
  • Disallow some arithmetic expressions like ((1=3)) and (($(echo 1 + 2)))
  • Binary commands like &&, || and pipes are now left-associative
• fileutil
  • CouldBeScript may now return true on non-regular files such as symlinks
• interp
  • New experimental package to interpret a syntax.File in pure Go

1.2.0 - 2017-02-22

• syntax
  • Add support for escaped characters in bash regular expressions
• fileutil
  • New package with some code moved from cmd/shfmt, now importable
  • New funcs HasShebang and CouldBeScript
  • Require shebangs to end with whitespace to reject #!/bin/shfoo

1.1.0 - 2017-01-05

• syntax
  • Parse [[ a = b ]] like [[ a == b ]], deprecating TsAssgn in favour of TsEqual
  • Add support for the -k, -G, -O and -N unary operators inside [[ ]]
  • Add proper support for ! in parameter expansions, like ${!foo}
  • Fix a couple of crashes found via fuzzing
• cmd/shfmt
  • Rewrite [[ a = b ]] into the saner [[ a == b ]] (see above)

1.0.0 - 2016-12-13

• syntax
  • Stable release, API now frozen
  • Parse now reads input in chunks of 1KiB
• cmd/shfmt
  • Add -version flag

0.6.0 - 2016-12-05

• syntax
  • Parse now takes an io.Reader instead of []byte
  • Invalid UTF-8 is now reported as an error
  • Remove backtracking for $(( and ((
  • Walk now takes a func literal to simplify its use

0.5.0 - 2016-11-24

• cmd/shfmt
  • Remove -cpuprofile
  • Don't read entire files into memory to check for a shebang
• syntax
  • Use uint32 for tokens and positions in nodes
  • Use Word and Lit pointers consistently instead of values
  • Ensure Word.Parts is never empty
  • Add support for expressions in array indexing and parameter expansion slicing

0.4.0 - 2016-11-08

• Merge parser, ast, token and printer into a single package syntax
• Use separate operator types in nodes rather than Token
• Use operator value names that express their function
• Keep ; if on a separate line when formatting
• cmd/shfmt
  • Allow whitespace after #! in a shebang
• syntax
  • Implement operator precedence for [[ ]]
  • Parse $(foo) and foo as the same (shfmt then converts the latter to the former)
  • Rename Quoted to DblQuoted for clarity
  • Split ((foo)) nodes as their own type, ArithmCmd
  • Add support for bash parameter expansion slicing

0.3.0 - 2016-10-26

• Add support for bash's coproc and extended globbing like @(foo)
• Improve test coverage, adding tests to cmd/shfmt and bringing parser and printer close to 100%
• Support empty C-style for loops like for ((;;)) ...
• Support for the >| redirect operand
• cmd/shfmt
  • Fix issue where .sh and .bash files might not be walked if running on a directory
  • Fix issue where -p was not obeyed when formatting stdin
• parser
  • $'' now generates an ast.SglQuoted, not an ast.Quoted
  • Support for ambiguous (( like with $((
  • Improve special parameter expansions like $@ or $!
  • Improve bash's export typeset, nameref and readonly
  • <>, >& and <& are valid POSIX
  • Support for bash's ^, ^^, , and ,, operands inside ${}

0.2.0 - 2016-10-13

• Optimizations all around, making shfmt ~15% faster
• cmd/shfmt
  • Add -p flag to only accept POSIX Shell programs (parser.PosixConformant)
• parser
  • Add support for ambiguous $(( as in $((foo) | bar)
  • Limit more bash features to PosixConformant being false
  • Don't parse heredoc bodies in nested expansions and contexts
  • Run tests through bash to confirm the presence of a parse error
• ast
  • Add Walk(Visitor, Node) function

0.1.0 - 2016-09-20

Initial release.