├── .gitignore
├── LICENSE
├── README.rst
├── doc
    └── demo.gif
├── nimsh.nimble
└── src
    └── nimsh.nim


/.gitignore:
--------------------------------------------------------------------------------
1 | 
2 | bin/nimsh


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2020 jiro
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/README.rst:
--------------------------------------------------------------------------------
 1 | =====
 2 | nimsh
 3 | =====
 4 | 
 5 | nimsh is a simple implementation of a shell in pure Nim.
 6 | nimsh is inspired by `lsh <https://github.com/brenns10/lsh>`_.
 7 | 
 8 | |image-demo|
 9 | 
10 | .. contents:: Table of contents
11 |    :depth: 3
12 | 
13 | Installation
14 | ============
15 | 
16 | .. code-block:: shell
17 | 
18 |    nimble install -Y https://github.com/jiro4989/nimsh
19 | 
20 | or
21 | 
22 | Download binary from `Release <https://github.com/jiro4989/nimsh/releases>`_.
23 | 
24 | Usage
25 | =====
26 | 
27 | .. code-block:: shell
28 | 
29 |    nimble build
30 |    ./nimsh
31 | 
32 | LICENSE
33 | =======
34 | 
35 | MIT
36 | 
37 | .. |image-demo| image:: ./doc/demo.gif
38 | 


--------------------------------------------------------------------------------
/doc/demo.gif:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/jiro4989/nimsh/d5976a66ffbced8b4b12c5dff1dca07a8485246c/doc/demo.gif


--------------------------------------------------------------------------------
/nimsh.nimble:
--------------------------------------------------------------------------------
 1 | # Package
 2 | 
 3 | version       = "0.1.0"
 4 | author        = "jiro4989"
 5 | description   = "A tiny shell implementation in pure Nim."
 6 | license       = "MIT"
 7 | srcDir        = "src"
 8 | bin           = @["nimsh"]
 9 | binDir        = "bin"
10 | 
11 | 
12 | # Dependencies
13 | 
14 | requires "nim >= 1.0.6"
15 | 


--------------------------------------------------------------------------------
/src/nimsh.nim:
--------------------------------------------------------------------------------
 1 | from strutils import split
 2 | import os, tables, posix
 3 | 
 4 | const
 5 |   statusOk = 1
 6 |   statusNg = 0
 7 | 
 8 | proc nimshCd(args: seq[string]): int =
 9 |   if args.len < 2:
10 |     stderr.writeLine("nimsh: expected argument to 'cd'")
11 |   else:
12 |     setCurrentDir(args[1])
13 |   return statusOk
14 | 
15 | proc nimshExit(args: seq[string]): int =
16 |   return statusNg
17 | 
18 | const
19 |   builtinCommands = {
20 |     "cd": nimshCd,
21 |     "exit": nimshExit
22 |   }.toTable
23 | 
24 | proc nimshLaunch(args: seq[string]): int =
25 |   let pid = fork()
26 |   if pid == 0:
27 |     if execvp(args[0].cstring, allocCStringArray(args)) == -1:
28 |       stderr.writeLine "nimsh"
29 |   elif pid < 0:
30 |     stderr.writeLine "nimsh"
31 |   else:
32 |     var status: cint
33 |     while (not WIFEXITED(status)) and (not WIFSIGNALED(status)):
34 |       discard waitpid(pid, status, WUNTRACED)
35 |   return statusOk
36 | 
37 | proc nimshExec(args: seq[string]): int =
38 |   if args.len < 1: return statusOk
39 |   for cmdName, cmd in builtinCommands:
40 |     if args[0] == cmdName:
41 |       return cmd(args)
42 |   return nimshLaunch(args)
43 | 
44 | proc nimshLoop =
45 |   const
46 |     tokenDelimiter = {'\t', '\r', '\n', '\a', ' '}
47 |   var
48 |     line: string
49 |     args: seq[string]
50 |     status = statusOk
51 |   while status != statusNg:
52 |     stdout.write("nimsh > ")
53 |     if not stdin.readLine(line):
54 |       break
55 |     args = line.split(tokenDelimiter)
56 |     status = nimshExec(args)
57 |     sleep 100
58 | 
59 | proc main: int =
60 |   nimshLoop()
61 | 
62 | when isMainModule:
63 |   quit main()
64 | 


--------------------------------------------------------------------------------