string_utils: Common string utilities
In jtimonen/stanbreaker: Fast way to try out different things in Stan

Common string utilities

apply_lines(txt, fun)

ensure_trailing_linebreak(txt)

remove_empty_lines(txt)

starts_with_include(txt)

flush_includes_left(txt)

`txt`	a character vector
`fun`	a function that takes one code line (without line break) as its only argument

updated character vector

apply_lines: Apply a function to each line of text
ensure_trailing_linebreak: Ensure that a character vector ends in a line break
remove_empty_lines: Remove all empty lines
starts_with_include: Check if first eight non-whitespace characters are #include
flush_includes_left: Justify all #include directives all the way to the left