first commit

Signed-off-by: Michael <michael.lindman@gmail.com>

.gitignore

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+go.sum

LICENSE

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+MIT License Copyright (c) 2021 Michael Lindman
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# Currency
+
+Simple golang currency converter using [fawazahmed0](https://github.com/fawazahmed0)'s [currency-api](https://github.com/fawazahmed0/currency-api).
+
+## Installation
+
+```sh
+go install git.0cd.xyz/michael/currency
+```
+
+## Usage
+
+```sh
+./currency gbp usd 50
+```
+
+## License
+
+```text
+MIT License Copyright (c) 2021 Michael Lindman
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+```

go.mod

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+module git.0cd.xyz/michael/currency
+
+go 1.17
+
+require git.0cd.xyz/michael/toolbox v0.0.0-20211024232522-b1a517857097 // indirect

main.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+
+	"git.0cd.xyz/michael/toolbox/req"
+)
+
+const url = "https://cdn.jsdelivr.net/gh/fawazahmed0/currency-api@1/latest/currencies/"
+
+func main() {
+	from, to, value := ui()
+	body, _, err := req.Get(url+from+"/"+to+".json", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	var result map[string]interface{}
+	if err := json.Unmarshal(body, &result); err != nil {
+		log.Fatal(err)
+	}
+	v, ok := result[to].(float64)
+	if !ok {
+		log.Fatal("invalid conversion")
+	}
+	fmt.Printf("%.2f %s\n", v*value, to)
+}
+
+func ui() (from, to string, value float64) {
+	if len(os.Args) < 4 {
+		os.Exit(1)
+	}
+	val, err := strconv.ParseFloat(os.Args[3], 64)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return os.Args[1], os.Args[2], val
+}