github.com/mvdan/sh

• 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

• 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

• 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

• 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)

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

• 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

• 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

• 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

• 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 ${}

• 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

Initial release.