雖然 Kotlin 的主流用法都是拿來寫手機、伺服器或是桌面應用程式，但其實 Kotlin 也具備 Scripting Language 的特點，可以在 Terminal 底下隨寫即跑，執行各種任務。在這場分享裡，將會介紹 Kotlin Script 這種特別的執行模式，示範如何把 Kotlin 當成 Scripting Language 用，並結合 kscript，依照不同情境需求撰寫自動化程式，最後再介紹幾個延伸應用的開放原始碼專案，展現把 Kotlin 當成強型別 Bash 的潛力。

1. otlin
—
(Shengyou Fan)
KotlinConf Global Kaohsiung
2020/04/18

2. —
• Developer Advocate
• Backend Developer
• Open Source Community Organizer

3. Developer …
—

5. —
Bash zsh Fish PowerShell

6. …
—
val x: Int

7. Kotlin
—
Browser
Kotlin/JS
Server
Kotlin/JVM
iOS
Kotlin/Native
Android
Kotlin/JVM

8. …
—
Kotlin Scripting Language
+

9. Kotlin
—
.kt

10. Kotlin Script
—
.kts

11. Kotlin Compiler
—
$ curl -s "https://get.sdkman.io" | bash
$ source "$HOME/.sdkman/bin/sdkman-init.sh"
$ sdk install kotlin
$ sdk list kotlin
$ sdk current kotlin
$ sdk use kotlin <version>
$ sdk default kotlin <version>
$ sdk upgrade kotlin
https://sdkman.io/

12. Kotlin Script
—
$ kotlinc -script [file].kts

13. Kotlin Script
—
$ chmod +x [file].kts
$ ./[file].kts
// [file].kts
#!/usr/bin/env kotlinc -script
// ...

14. N
—
$ find /path/to/directory/ -mindepth 1 -mtime +5 -delete
$ find /root/Maildir/ -mindepth 1 -type f -mtime +14 | xargs rm
$ find /path/to -type f -mtime +5 -exec rm {} ;
$ find /path/to/files* -mtime +5 -delete
$ find . -mtime +3 -type f -not -name '*pid*' |xargs rm -rf

15. —
$ curl -O https://...
$ curl -O https://...
$ curl -O https://...
$ curl -O https://...
$ curl -O https://...
$ curl -O https://...
$ curl -O https://...
$ curl -O https://...
$ curl -O https://...
$ curl -O https://...

16. tsv
—
$ awk '{sub(/[ t]*$/, "");print}' [file].tsv
$ awk '{print $10, $1, $12}' [file].tsv
$ awk '{print $1, $2, "F11-"$7}' [file].tsv
$ awk '!($3="")' [file].tsv

17. Kotlin Script - kscript
—

18. kscript
—
https://sdkman.io/
$ sdk install kscript

19. kscript
—
$ kotlinc -script [file].kts
$ kscript [file].kts

20. kscript
—
// [file].kts
#!/usr/bin/env kotlinc -script
#!/usr/bin/env kscript
// ...$ chmod +x [file].kts
$ ./[file].kts

21. jar
—
$ time kotlinc -script [file].kts
real 0m2.419s
user 0m5.563s
sys 0m0.345s
$ time kscript [file].kts
real 0m0.346s
user 0m0.346s
sys 0m0.062s

22. IntelliJ IDEA
—
$ kscript --idea [file].kts

23. Package
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@file:DependsOn("com.squareup.okhttp3:okhttp:4.3.1")
@file:DependsOn("com.squareup.moshi:moshi-kotlin:1.9.2")

24. API
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@file:DependsOn("com.github.holgerbrandl:kscript-support:1.2.4")

25. fatjar
—
$ kscript --package [file].kts

26. —
https://kotlinlang.org/docs/reference/native-overview.html https://www.graalvm.org/

27. —
https://ajalt.github.io/clikt/
https://dailymotion.github.io/kinta/

28. Kotlin
—
• Script
• Script
• IDE Script
•

29. —
https://github.com/shengyou/kotlin-script
GitHub

30. Kotlin
—
• 2:00
•
•
•
https://bit.ly/kotlinstudygroup

31. (Shengyou)
shengyou.fan@jetbrains.com
Q&A
—
otlin