aa122cbae7
This CL can be used to compare the style of nixpkgs-fmt against other formatters (nixpkgs, alejandra). Change-Id: I87c6abff6bcb546b02ead15ad0405f81e01b6d9e Reviewed-on: https://cl.tvl.fyi/c/depot/+/4397 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org> Reviewed-by: lukegb <lukegb@tvl.fyi> Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: Profpatsch <mail@profpatsch.de> Reviewed-by: kanepyork <rikingcoding@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Reviewed-by: cynthia <cynthia@tvl.fyi> Reviewed-by: edef <edef@edef.eu> Reviewed-by: eta <tvl@eta.st> Reviewed-by: grfn <grfn@gws.fyi>
93 lines
3.5 KiB
Nix
93 lines
3.5 KiB
Nix
{ depot, pkgs, ... }:
|
||
|
||
let
|
||
cdbListToNetencode = depot.nix.writers.rustSimple
|
||
{
|
||
name = "cdb-list-to-netencode";
|
||
dependencies = [
|
||
depot.third_party.rust-crates.nom
|
||
depot.users.Profpatsch.execline.exec-helpers
|
||
depot.users.Profpatsch.netencode.netencode-rs
|
||
];
|
||
} ''
|
||
extern crate nom;
|
||
extern crate exec_helpers;
|
||
extern crate netencode;
|
||
use std::collections::HashMap;
|
||
use std::io::BufRead;
|
||
use nom::{IResult};
|
||
use nom::sequence::{tuple};
|
||
use nom::bytes::complete::{tag, take};
|
||
use nom::character::complete::{digit1, char};
|
||
use nom::error::{context, ErrorKind, ParseError};
|
||
use nom::combinator::{map_res};
|
||
use netencode::{T, Tag};
|
||
|
||
fn usize_t(s: &[u8]) -> IResult<&[u8], usize> {
|
||
context(
|
||
"usize",
|
||
map_res(
|
||
map_res(digit1, |n| std::str::from_utf8(n)),
|
||
|s| s.parse::<usize>())
|
||
)(s)
|
||
}
|
||
|
||
fn parse_cdb_record(s: &[u8]) -> IResult<&[u8], (&[u8], &[u8])> {
|
||
let (s, (_, klen, _, vlen, _)) = tuple((
|
||
char('+'),
|
||
usize_t,
|
||
char(','),
|
||
usize_t,
|
||
char(':')
|
||
))(s)?;
|
||
let (s, (key, _, val)) = tuple((
|
||
take(klen),
|
||
tag("->"),
|
||
take(vlen),
|
||
))(s)?;
|
||
Ok((s, (key, val)))
|
||
}
|
||
|
||
fn main() {
|
||
let mut res = vec![];
|
||
let stdin = std::io::stdin();
|
||
let mut lines = stdin.lock().split(b'\n');
|
||
loop {
|
||
match lines.next() {
|
||
None => exec_helpers::die_user_error("cdb-list-to-netencode", "stdin ended but we didn’t receive the empty line to signify the end of the cdbdump input!"),
|
||
Some(Err(err)) => exec_helpers::die_temporary("cdb-list-to-netencode", format!("could not read from stdin: {}", err)),
|
||
Some(Ok(line)) =>
|
||
if &line == b"" {
|
||
// the cdbdump input ends after an empty line (double \n)
|
||
break;
|
||
} else {
|
||
match parse_cdb_record(&line) {
|
||
Ok((b"", (key, val))) => {
|
||
let (key, val) = match
|
||
std::str::from_utf8(key)
|
||
.and_then(|k| std::str::from_utf8(val).map(|v| (k, v))) {
|
||
Ok((key, val)) => (key.to_owned(), val.to_owned()),
|
||
Err(err) => exec_helpers::die_user_error("cdb-list-to-netencode", format!("cannot decode line {:?}, we only support utf8-encoded key/values pairs for now: {}", String::from_utf8_lossy(&line), err)),
|
||
};
|
||
let _ = res.push((key, val));
|
||
},
|
||
Ok((rest, _)) => exec_helpers::die_user_error("cdb-list-to-netencode", format!("could not decode record line {:?}, had some trailing bytes", String::from_utf8_lossy(&line))),
|
||
Err(err) => exec_helpers::die_user_error("cdb-list-to-netencode", format!("could not decode record line {:?}: {:?}", String::from_utf8_lossy(&line), err)),
|
||
}
|
||
}
|
||
}
|
||
}
|
||
let list = T::List(res.into_iter().map(
|
||
|(k, v)| T::Record(vec![(String::from("key"), T::Text(k)), (String::from("val"), T::Text(v))].into_iter().collect())
|
||
).collect());
|
||
netencode::encode(&mut std::io::stdout(), &list.to_u());
|
||
}
|
||
|
||
'';
|
||
|
||
in
|
||
{
|
||
inherit
|
||
cdbListToNetencode
|
||
;
|
||
}
|