Александр Воронов | building cli with swift

IT Saturday • @aleks_voronov • Stanfy

BUILDING CLI WITH SWIFTALEXANDER VORONOV, STANFY

@aleks_voronov


REASON WHY?


OTHER PLATFORMS


JAVASCRIPT

NODEJS NPM

BOWER GULP

GRUNT


RUBY

RACK RAILS

SINATRA RUBYGEMS

RAKE


PYTHONPYPI PIP …


SWIFT

COCOAPODS CARTHAGE

SPM PERFECT

COMMANDANT


FULLSTACK MULTIPLATFORM


WHAT IS CLI?


CLI ARGUMENTS


POSIX STANDARD 📘SHORT FLAGS

$ ls -a

$ ruby -v

$ git commit -m "..."


GNU STANDARD 📙LONG FLAGS

$ ls --all

$ ruby --version

$ git commit --message "..."


COMBINED FLAGS 🏴$ git commit -a -m "..."

$ git commit -am "..."


SUBCOMMANDS 🏘$ git log -2

$ git status

$ git commit -am "..."


STANDARD IO 📥📤0 - STDIN

1 - STDOUT 2 - STDERR


0 - STDIN 1 - STDOUT 2 - STDERR

$ cat nofile

> cat: nofile: No such file or directory



$ cat nofile 2>>err.log



$ cat nofile 2>&1



$ cat nofile 2>>err.log 1>>out.log



$ cat nofile 2>/dev/null



$ cat nofile 2>&1 | grep kernel


UNIX PIPELINES ⛓$ ls -l | grep "Mar" | sort


UNIX PIPELINES ⛓$ ps aux | grep Xcode | awk '{print $2}'


UNIX PIPELINES ⛓$ git branch | xargs git branch -D

😈


CLI WITH SWIFT 🖥


SWIFT REPL 🔃(READ-EVALUATION-PRINT-LOOP)

$ swift


IMMEDIATE MODE 🚀$ swift script.swift


SWIFT COMPILE ⚙$ swiftc script.swift $ ./script


SWIFT COMPILE ⚙$ swiftc script.swift -o myscript $ ./myscript


EXECUTABLE SCRIPTS 💾


EXECUTABLE SCRIPTS

#!/USR/BIN/SWIFT

HASHBANG


EXECUTABLE SCRIPTS

CHMOD +X SCRIPT.SWIFT


SCALING OUR CLI 🏗WORKING WITH MULTIPLE FILES


MAIN.SWIFT 👑


EXECUTING MULTIPLE FILES📄📄$ swift main.swift script.swift


$ swiftc main.swift script.swift -o script

EXECUTING MULTIPLE FILES📄📄


$ swiftc script.swift main.swift -o script



$ swiftc *.swift -o script



$ find . -iname '*.swift' | xargs swiftc -o script



EXTERNAL RESOURCES 🎁


SYSTEM DEPENDENCIES 💼$ swiftc script.swift

$ xcrun -sdk macosx swiftc script.swift


CUSTOM DEPENDENCIES 🛠-F

$ swift -F /Carthage/Build/Mac script.swift


CUSTOM DEPENDENCIES

#!/USR/BIN/SWIFT -F Carthage/Build/Mac

HASHBANG


COMPILING DEPENDENT SCRIPT 🤖


$ xcrun \ -sdk macosx swiftc \ -F Carthage/Build/Mac script.swift

COMPILING DEPENDENT SCRIPT

> dyld: Library not loaded: @rpath


$ xcrun \ -sdk macosx swiftc \ -F Carthage/Build/Mac script.swift \ -Xlinker -rpath \ -Xlinker @executable_path/Carthage/Build/Mac

COMPILING DEPENDENT SCRIPT


DEPENDENCIES MANAGEMENT 🍴


COCOAPODS 🤔


CARTHAGE 😏


SPM 😳SWIFT PACKAGE MANAGER


PARSING ARGUMENTS 📬


PARSING ARGUMENTS

$ ./script one two three

$ ./script one\ two\ three

$ ./script "one two three"

3 args

1 arg

1 arg


PROCESS ENUMProcess.arguments == [ "./script.swift", "one", "two", "three"

]


FILESYSTEM 🗄


FILESYSTEMNSFILEMANAGER NSFILEHANDLER

NSTASK NSPIPE


HANDY LIBRARIES🏛

COMMANDER OPTIONKIT

COMMANDANT REACTIVETASKS PRETTYCOLORS

https://github.com/kylef/Commander

https://github.com/nomothetis/OptionKit

https://github.com/Carthage/Commandant

https://github.com/Carthage/ReactiveTask

https://github.com/jdhealy/PrettyColors


REAL WORLD EXAMPLES 🌍

CARTHAGEKITCARTHAGE CLI

https://github.com/Carthage/Carthage/tree/master/Source/CarthageKit

https://github.com/Carthage/Carthage/tree/master/Source/carthage


THANK YOU!


Q/A

@ALEKS_VORONOV A-VORONOV

https://twitter.com/aleks_voronov

https://github.com/a-voronov

Александр Воронов | building cli with swift

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