guix/src/libexpr/common-opts.hh
Eelco Dolstra 1ecc97b6bd * Add a Nix expression search path feature. Paths between angle
brackets, e.g.

    import <nixpkgs/pkgs/lib>

  are resolved by looking them up relative to the elements listed in
  the search path.  This allows us to get rid of hacks like

    import "${builtins.getEnv "NIXPKGS_ALL"}/pkgs/lib"

  The search path can be specified through the ‘-I’ command-line flag
  and through the colon-separated ‘NIX_PATH’ environment variable,
  e.g.,

    $ nix-build -I /etc/nixos ...

  If a file is not found in the search path, an error message is
  lazily thrown.
2011-08-06 16:05:24 +00:00

21 lines
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C++

#ifndef __COMMON_OPTS_H
#define __COMMON_OPTS_H
#include "eval.hh"
namespace nix {
/* Some common option parsing between nix-env and nix-instantiate. */
bool parseOptionArg(const string & arg, Strings::iterator & i,
const Strings::iterator & argsEnd, EvalState & state,
Bindings & autoArgs);
bool parseSearchPathArg(const string & arg, Strings::iterator & i,
const Strings::iterator & argsEnd, EvalState & state);
}
#endif /* !__COMMON_OPTS_H */