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

RACK RAILS

SINATRA RUBYGEMS

PYTHONPYPI PIP …

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

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

FILESYSTEM 🗄

FILESYSTEMNSFILEMANAGER NSFILEHANDLER

NSTASK NSPIPE

HANDY LIBRARIES🏛

COMMANDER OPTIONKIT

COMMANDANT REACTIVETASKS PRETTYCOLORS

REAL WORLD EXAMPLES 🌍

CARTHAGEKITCARTHAGE CLI

THANK YOU!

@ALEKS_VORONOV A-VORONOV

Александр Воронов | building cli with swift

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