Introduce line editor library.


Introduce line editor library.

This library will be used by clang-query. I can imagine LLDB becoming another
client of this library, so I think LLVM is a sensible place for it to live.
It wraps libedit, and adds tab completion support.

The code is loosely based on the line editor bits in LLDB, with a few

  • Polymorphism for retrieving the list of tab completions, based on the concept pattern from the new pass manager.
  • Tab completion doesn't corrupt terminal output if the input covers multiple lines. Unfortunately this can only be done in a truly horrible way, as far as I can tell. But since the alternative is to implement our own line editor (which I don't think LLVM should be in the business of doing, at least for now) I think it may be acceptable.
  • Includes a fallback for the case where the user doesn't have libedit installed.

Note that this uses C stdio, mainly because libedit also uses C stdio.

Differential Revision:


pccJan 31 2014, 3:46 PM
Differential Revision
D2200: Introduce line editor library.
rL200594: Introduce llvm::sys::path::home_directory.