[PATCH v3 0/3] MR4168: cmd: Handle caret / blocks with whitespace only lines better

[userid0x0 (＠userid0x0)]

This series of patches is heavily inspired by
  https://gitlab.winehq.org/wine/wine/-/merge_requests/277
and solves problems related to
- whitespace only lines in blocks
- EOF in the middle of the blocks
- lines with caret followed by EOF

--
  v3: cmd: Handle lines terminated with caret followed by EOF
      cmd: Handle unterminated/unbalanced parentheses
      cmd: Handle whitespace only lines in parentheses blocks
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/4168