xztaityozx / ocs

onliner csharp

ocs

ocs is oneliner csharp

Install

Build from source

# clone this repository
$ git clone https://github.com/xztaityozx/ocs
$ cd ocs/ocs

# build ocs
$ make publish

# install ocs to $HOME/.local/bin
$ make install
# example) install to /usr/loca/bin/
$ PREFIX=/usr/local/bin/ make install

Download binary from GitHub Releases

Download standalone binary from release page

Uninstall

$ make uninstall

Usage

Basic usage

$ seq 10 | ocs 'BEGIN{var sum=0}{sum+=int.Parse(F0)}END{Console.WriteLine(sum)}'
55

The code after BEGIN is begin block code. The code after END is end block code. These run once before/after main loop(like awk's BEGIN, END).

Built-in variable

F

Field array.

Example

$ echo a b c | ocs '{Console.WriteLine($"1: {F[1]}, 2: {F[2]}, 3: {F[3]}, 0: {F[0]}")}'
1: a, 2: b, 3: c, 0: a b c

F0

Line

Example

$ echo a b c | ocs '{Console.WriteLine($"F0: {F0}, F[0]: {F[0]}")}'
F0: a b c, F[0]: a b c

NF

Number of fields

Example

$ echo -e "a b c\nd e f g\n1 2 3 4 5" | ocs '{Console.WriteLine($"F0={F0}, NF={NF}")}'
F0=a b c, NF=4
F0=d e f g, NF=5
F0=1 2 3 4 5, NF=6

NR

Number of line

Example

$ yes | head | ocs '{Console.WriteLine(NR)}'
1
2
3
4
5
6
7
8
9
10

Env

Environment dictionary.

$ echo | ocs '{Console.WriteLine(Env["LANG"])}'
ja_JP.UTF-8

Built-in functions

i(), d()

i() is alias to int.Parse

Example

$ echo 100 | ocs '{Console.WriteLine($"int.Parse: {int.Parse(F0)+10}, i: {i(F0)+20}")}'
int.Parse: 110, i: 120

d() is alias to decimal.Parse([str] ,NumberStyles.Float, CultureInfo.CurrentCulture.NumberFormat)

Example

$ echo 10 1.1 1e9| ocs '{Console.WriteLine($"{d(F[1])}, {d(F[2])}, {d(F[3])}")}'
10, 1.1, 1000000000

print(), println()

Shorthand to Console.Write/Console.WriteLine

Example

seq 5 | ocs '{Console.WriteLine($"Console.WriteLine: {F0}"); println($"println: {F0}")}'
Console.WriteLine: 1
println: 1
Console.WriteLine: 2
println: 2
Console.WriteLine: 3
println: 3
Console.WriteLine: 4
println: 4
Console.WriteLine: 5
println: 5

Pattern and Action

Example

$ seq 10 | ocs 'i(F0)%2==0{println(F0)}'
2
4
6
8
10

$ seq 10 | ocs 'F0.Length==1{println(F0)}'
1
2
3
4
5
6
7
8
9

Options

-U, --using-list using Assembles

Example

$ ocs -U System.IO '...'

# multiple
$ ocs -U System.IO,System.Collections.Generic '...' 

-d, --input-delimiter (Default: )

Example

cat csv | ocs -d, '{println(F[1])}'

-f, --file input file

Example

ocs -d, -f csv '{println(F[1])}'

-D, --output-delimiter (Default: )

Example

cat csv | ocs -d, -D : '{println(F)}' 

-R, --reference-list list of reference path

Example

ocs -R YourDll.dll '...'

--language-version (Default: C# 10) set language version

set compile language version

-r, --remove-empty (Default: false) remove empty entries from inputs

$ echo "a   b   c    d" | ocs "{println(F[1], F[4])}"
a b

$ echo "a   b   c    d" | ocs -r "{println(F[1], F[4])}"
a d

-g, --use-regexp (Default: false) use regular expressions for input delimiter

$ echo "a   b   c   d" | ocs -gd'\s+' "{println(F[1], F[4])}"
a d

--print-generated (Default: false) print generated code and exit

$ ocs --print-generated "{println(F0)}"
public class Runner : IRunner
{
    private Global global;
    public Runner(Global global) => this.global = global;
    private string Ofs => global.Ofs;
    private int NR => global.NR;
    private int NF => global.NF;
    private List<string> F => global.F;
    private string F0 => global.F0;
    private void print(params object[] o) => global.Print(Global.PrintOption.None, o);
    private void println(params object[] o) => global.Print(Global.PrintOption.Line, o);
    private int i(string s) => global.i(s);
    private decimal d(string s) => global.d(s);
    // Entry point
    public void Run()
    {
        while (global.NextLine())
        {
            println(F0);
        }
    }
}