merge-lists: make it possible to specify pattern to match
The `merge-lists` tool doesn't know anything about Python other than
its regex that attempts to match import lines. Let's make it possible
to pass in a custom regex so it's easy to use the tool for e.g. C/C++
`#include` lines or Rust `use` lines (given the limited).
Differential Revision: https://phab.mercurial-scm.org/D12392
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
end_of_line = lf
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
end_of_line = lf
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false
end_of_line = lf