Implementing executor

[magicant]

This is a tracking issue for implementation of command execution.

Redirections

• File redirections (<, <>, >, >>, >|)
  • Socket redirections
• Duplications (<&, >&)
• Pipes (>>|)
• Here documents (<<, <<-, <<<)
  • Quoted delimiters and literal here document contents
  • Here document contents that contain escapes and expansions
  • Trimming leading tabs
• Process redirections (<(foo), >(foo))

Words

• Backslash escapes
• Single quotes
• Double quotes
• Tilde expansion
• Backquotes
• Dollar word units ($...)
  • Parameter expansion without braces ($FOO)
  • Parameter expansion with braces (${FOO})
    • Length (${#foo})
    • Nested expansion (${${foo}})
    • Index (${foo[1]})
    • Standard modifiers (${foo+bar}, ${foo-bar}, ${foo=bar}, ${foo?bar})
    • Colon modifier (${foo:+bar}, ${foo:-bar}, ${foo:=bar}, ${foo:?bar})
    • Standard matching modifiers (${foo#bar}, ${foo##bar}, ${foo%bar}, ${foo%%bar})
    • Non-standard matching modifiers (${foo/bar/baz}, ${foo:/bar/baz}, ${foo/#bar/baz}, ${foo/%bar/baz}, ${foo//bar/baz})
  • Command substitution ($(foo))
  • Arithmetic expansion ($((1+1)))
  • Character expansion ($'\a')

Commands

• Sequential lists (;)
• Asynchronous lists (&)
• And-or lists (&&, ||)
• Pipelines (|)
• Simple commands
  • Command word expansion
  • Redirections
  • Assignments
  • Command search
• Compound commands
  • Braces ({ foo; })
  • Subshells ((foo))
  • For loops
  • While and until loops
  • If conditional constructs
  • Case conditional constructs
  • Double bracket constructs ([[ foo ]])
• Function definitions

[magicant]

Closing in favor of #51