show line numbers in errors

[Ronny Pfannschmidt]

when a error is encountered, instead of line number/column, character since start of file is shown

that makes it hard o figure where a mistake was

instead of

`Failed! 1 error found at:
- flake.nix: unexpected TOKEN_ASSIGN at 3344..3435, wanted any of [TOKEN_SEMICOLON]
Checking style in 5 files using 4 threads.``

id like to see

 flake.nix: unexpected TOKEN_ASSIGN at line 124: 30-31, wanted any of [TOKEN_SEMICOLON]
Checking style in 5 files using 4 threads.``

a smaller example would be

 #example.nix
{pkgs, lib}: {
  mypkg = lib.test;
  mypkg2 = lib.test2
  mistake = {};
}

with an error of

/mistake.nix: unexpected TOKEN_ASSIGN at 80..92, wanted any of [TOKEN_SEMICOLON]
Checking style in 5 files using 4 threads.

im using alejandra via home manager vscode plugin and nix-pre-commit

[Kevin Amado]

I just opened: #365

With this Alejandra would do the following:

[kamadorueda@machine:/data/alejandra]$ cat -n test.nix
     1	{pkgs, lib}: {
     2	  mypkg = lib.test;
     3	  mypkg2 = lib.test2
     4	  mistake = {};
     5	}

[kamadorueda@machine:/data/alejandra]$ cargo run test.nix
    Finished dev [optimized + debuginfo] target(s) in 0.03s
     Running `target/debug/alejandra test.nix`
Checking style in 1 file using 4 threads.


Failed! 1 error found at:
- test.nix: syntax error, unexpected '='. Starts at line 4 column 11, ends at line 4 column 12

[kamadorueda@machine:/data/alejandra]$ nix-instantiate --parse test.nix
error: syntax error, unexpected '=', expecting ';'

       at /data/alejandra/test.nix:4:11:

            3|   mypkg2 = lib.test2
            4|   mistake = {};
             |           ^
            5| }

Will have to wait some time until it compiles on the different platforms though