├── .gitignore
├── tests
    ├── config.nims
    └── test1.nim
├── luhncheck.nimble
├── README.md
├── src
    └── luhncheck.nim
└── LICENSE


/.gitignore:
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1 | nimcache/
2 | 


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/tests/config.nims:
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1 | switch("path", "$projectDir/../src")


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/tests/test1.nim:
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1 | import unittest
2 | import luhncheck
3 | 
4 | test "can validate card checksums":
5 |     check validate(356938035643809) == true
6 |     check validate(534618613411236) == false
7 | 


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/luhncheck.nimble:
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 1 | # Package
 2 | 
 3 | version       = "0.1.0"
 4 | author        = "sillibird"
 5 | description   = "Implementation of Luhn algorithm in nim."
 6 | license       = "MIT"
 7 | srcDir        = "src"
 8 | 
 9 | 
10 | # Dependencies
11 | 
12 | requires "nim >= 0.19.4"
13 | 


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/README.md:
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 1 | # luhncheck
 2 | Implementation of Luhn algorithm in nim.
 3 | 
 4 | ### Usage
 5 | Install the package with `nimble`
 6 | ```nim
 7 | nimble install luhncheck
 8 | ```
 9 | 
10 | ### Example Usage
11 | Validating a cards checksum
12 | ```nim
13 | if validate(356938035643809):
14 |     echo "Cards checksum appears to be valid"
15 | ```
16 | 
17 | License
18 | ----
19 | 
20 | MIT
21 | 


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/src/luhncheck.nim:
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 1 | from strutils import parseInt
 2 | from algorithm import reversed
 3 | from math import floor
 4 | 
 5 | proc validate*(number: int64): bool =
 6 |     let numberArray = reversed(toOpenArray($number, 0, len($number) - 1))
 7 |     var oddSum, evenSum: int
 8 |     for i in countup(0, numberArray.len() - 1):
 9 |         if i mod 2 == 0:
10 |             oddSum += parseInt($numberArray[i])
11 |         else:
12 |             evenSum += toInt(floor((2 * parseInt($numberArray[i])) / 10)) + (2 * parseInt($numberArray[i]) mod 10)
13 |     return (evenSum + oddSum) mod 10 == 0


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/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2019 SilliBird
 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 | 


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