v3.0.0

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)
  • OpenDevImpls is removed; see ExampleOpenHandler for an alternative
• 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.