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|
{ depot, pkgs, lib, ... }:
let
bins = depot.nix.getBins pkgs.coreutils [ "head" "printf" "cat" ]
// depot.nix.getBins pkgs.ncurses [ "tput" ]
// depot.nix.getBins pkgs.bc [ "bc" ]
// depot.nix.getBins pkgs.ocamlPackages.sexp [ "sexp" ];
print-ast = depot.nix.writers.rustSimple {
name = "print-ast";
dependencies = with depot.third_party.rust-crates; [
libloading
tree-sitter
];
} ''
extern crate libloading;
extern crate tree_sitter;
use std::mem;
use std::io::{Read};
use libloading::{Library, Symbol};
use tree_sitter::{Language, Parser};
/// Load the shared lib FILE and return the language under SYMBOL-NAME.
/// Inspired by the rust source of emacs-tree-sitter.
fn _load_language(file: String, symbol_name: String) -> Result<Language, libloading::Error> {
let lib = Library::new(file)?;
let tree_sitter_lang: Symbol<'_, unsafe extern "C" fn() -> _> =
unsafe { lib.get(symbol_name.as_bytes())? };
let language: Language = unsafe { tree_sitter_lang() };
// Avoid segmentation fault by not unloading the lib, as language is a static piece of data.
// TODO: Attach an Rc<Library> to Language instead.
mem::forget(lib);
Ok(language)
}
fn main() {
let mut args = std::env::args();
let so = args.nth(1).unwrap();
let symbol_name = args.nth(0).unwrap();
let file = args.nth(0).unwrap();
let mut parser = Parser::new();
let lang = _load_language(so, symbol_name).unwrap();
parser.set_language(lang).unwrap();
let bytes = std::fs::read(&file).unwrap();
print!("{}", parser.parse(&bytes, None).unwrap().root_node().to_sexp());
}
'';
tree-sitter-nix = buildTreeSitterGrammar {
language = "tree-sitter-nix";
source = pkgs.fetchFromGitHub {
owner = "cstrahan";
repo = "tree-sitter-nix";
rev = "791b5ff0e4f0da358cbb941788b78d436a2ca621";
sha256 = "1y5b3wh3fcmbgq8r2i97likzfp1zp02m58zacw5a1cjqs5raqz66";
};
};
watch-file-modified = depot.nix.writers.rustSimple {
name = "watch-file-modified";
dependencies = [
depot.third_party.rust-crates.inotify
depot.users.Profpatsch.netstring.rust-netstring
];
} ''
extern crate inotify;
extern crate netstring;
use inotify::{EventMask, WatchMask, Inotify};
use std::io::Write;
fn main() {
let mut inotify = Inotify::init()
.expect("Failed to initialize inotify");
let file = std::env::args().nth(1).unwrap();
let file_watch = inotify
.add_watch(
&file,
WatchMask::MODIFY
)
.expect("Failed to add inotify watch");
let mut buffer = [0u8; 4096];
loop {
let events = inotify
.read_events_blocking(&mut buffer)
.expect("Failed to read inotify events");
for event in events {
if event.wd == file_watch {
std::io::stdout().write(&netstring::to_netstring(file.as_bytes()));
std::io::stdout().flush();
}
}
}
}
'';
# clear screen and set LINES and COLUMNS to terminal height & width
clear-screen = depot.nix.writeExecline "clear-screen" {} [
"if" [ bins.tput "clear" ]
"backtick" "-in" "LINES" [ bins.tput "lines" ]
"backtick" "-in" "COLUMNS" [ bins.tput "cols" ]
"$@"
];
print-nix-file = depot.nix.writeExecline "print-nix-file" { readNArgs = 1; } [
"pipeline" [ print-ast "${tree-sitter-nix}/parser" "tree_sitter_nix" "$1" ]
"pipeline" [ bins.sexp "print" ]
clear-screen
"importas" "-ui" "lines" "LINES"
"backtick" "-in" "ls" [
"pipeline"
# when you pull out bc to decrement an integer it’s time to switch to python lol
[ bins.printf "x=%s; --x\n" "$lines" ]
bins.bc
]
"importas" "-ui" "l" "ls"
bins.head "-n\${l}"
];
print-nix-file-on-update = depot.nix.writeExecline "print-nix-file-on-update" { readNArgs = 1; } [
"if" [ print-nix-file "$1" ]
"pipeline" [ watch-file-modified "$1" ]
"forstdin" "-d" "" "file"
"importas" "file" "file"
print-nix-file "$file"
];
# copied from nixpkgs
buildTreeSitterGrammar =
{
# language name
language
# source for the language grammar
, source
}:
pkgs.stdenv.mkDerivation {
pname = "${language}-grammar";
inherit (pkgs.tree-sitter) version;
src = source;
buildInputs = [ pkgs.tree-sitter ];
dontUnpack = true;
configurePhase= ":";
buildPhase = ''
runHook preBuild
scanner_cc="$src/src/scanner.cc"
if [ ! -f "$scanner_cc" ]; then
scanner_cc=""
fi
$CXX -I$src/src/ -c $scanner_cc
$CC -I$src/src/ -shared -o parser -Os scanner.o $src/src/parser.c -lstdc++
runHook postBuild
'';
installPhase = ''
runHook preInstall
mkdir $out
mv parser $out/
runHook postInstall
'';
};
in depot.nix.utils.drvTargets {
inherit
print-ast
tree-sitter-nix
print-nix-file-on-update
watch-file-modified
;
}
|
