Previously, when users entered an incomplete expression in the REPL,
the continuation prompt was just 10 blank spaces, which looked invisible
and gave the impression that the REPL had stalled.
This change updates the prompt to " > ", aligning it visually
with 'nix-repl> ' and clearly indicating that the REPL is waiting for
more input.
Fixes: https://github.com/NixOS/nix/issues/12702
The short answer for why we need to do this is so we can consistently do
`#include "nix/..."`. Without this change, there are ways to still make
that work, but they are hacky, and they have downsides such as making it
harder to make sure headers from the wrong Nix library (e..g.
`libnixexpr` headers in `libnixutil`) aren't being used.
The C API alraedy used `nix_api_*`, so its headers are *not* put in
subdirectories accordingly.
Progress on #7876
We resisted doing this for a while because it would be annoying to not
have the header source file pairs close by / easy to change file
path/name from one to the other. But I am ameliorating that with
symlinks in the next commit.
- Since it's now private, give it a rename. Note that I want to switch the
word order on the public ones too.
- Since it is only needed by two files, just include there rather than
the nasty blanket-forced thing.
The internal "completionCallback" and "listPossibleCallback" helpers
are used only when building with editline; hence, do not build then
when using readline, matching their usage in
"ReadlineLikeInteracter::init()".
... as well as match buildReadlineNoMarkdown.
Unfortunately it doesn't support long inputs or multiline inputs
for now.
This needs to make better use of the interacter interface.
At this point many features are stripped out, but this works:
- Can run libnix{util,store,expr} unit tests
- Can run some Nix commands
Co-Authored-By volth <volth@volth.com>
Co-Authored-By Brian McKenna <brian@brianmckenna.org>
