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Delightful
Swift CLI apps
@polpielladev
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Hi! I’m Pol
Senior software engineer at the BBC
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Tooling + Swift ❤
• Familiar language
• Low memory footprint
• Type safety
• Mature ecosystem
• Great open-source community
• Build for multiple platforms
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🤩
The beauty of Swift
https://github.com/icanzilb/timeui
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Some great examples
built with Swift of course! ❤
• Sourcery - https://github.com/krzysztofzablocki/Sourcery
• SwiftLint - https://github.com/realm/SwiftLint
• Tuist - https://github.com/tuist/tuist
• SwiftGen - https://github.com/SwiftGen/SwiftGen
• Publish CLI - https://github.com/JohnSundell/Publish
• Vapor toolbox - https://github.com/vapor/toolbox
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import ArgumentParser
@main
struct Repeat: AsyncParsableCommand {
@Flag(help: "Include a counter with each repetition.")
var includeCounter = false
@Option(name: .shortAndLong, help: "The number of times to repeat 'phrase'.")
var count: Int? = nil
@Argument(help: "The phrase to repeat.")
var phrase: String
func run() async throws {
let repeatCount = count
??
2
for i in 1
...
repeatCount {
if includeCounter {
await someAsyncOperation()
} else {
print(phrase)
}
}
}
}
https://github.com/apple/swift-argument-parser
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import ArgumentParser
@main
struct Repeat: AsyncParsableCommand {
@Flag(help: "Include a counter with each repetition.")
var includeCounter = false
@Option(name: .shortAndLong, help: "The number of times to repeat 'phrase'.")
var count: Int? = nil
@Argument(help: "The phrase to repeat.")
var phrase: String
func run() async throws {
let repeatCount = count
??
2
for i in 1
...
repeatCount {
if includeCounter {
await someAsyncOperation()
} else {
print(phrase)
}
}
}
}
https://github.com/apple/swift-argument-parser
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import ArgumentParser
@main
struct Repeat: AsyncParsableCommand {
@Flag(help: "Include a counter with each repetition.")
var includeCounter = false
@Option(name: .shortAndLong, help: "The number of times to repeat 'phrase'.")
var count: Int? = nil
@Argument(help: "The phrase to repeat.")
var phrase: String
func run() async throws {
let repeatCount = count
??
2
for i in 1
...
repeatCount {
if includeCounter {
await someAsyncOperation()
} else {
print(phrase)
}
}
}
}
https://github.com/apple/swift-argument-parser
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No content
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✨
Swift on Linux!
https://github.com/keith/swiftpm-linux-cross
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🤩
Now easier?
https://github.com/swift-server/swiftly
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🚀
Automating releases!
https://www.polpiella.dev/automating-swift-package-releases-with-github-actions
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What is missing
though?
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Making tooling that looks great is hard…
• UX Developer experience is not great
• Other languages and ecosystems are more advanced
• Javascript is a great example!
• We need to aim for delightful! ✨
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No content
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No content
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The ecosystem allows for delightful
• Ora - https://github.com/sindresorhus/ora
• Chalk - https://github.com/chalk/chalk
• Prompts - https://github.com/terkelg/prompts
• Commander - https://github.com/tj/commander.js
• Clack - https://github.com/natemoo-re/clack
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Swift has some tools like that…
• Chalk - https://github.com/mxcl/Chalk
• Commander - https://github.com/kylef/Commander
• TermKit - https://github.com/migueldeicaza/TermKit
• ANSITerminal - https://github.com/pakLebah/ANSITerminal
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But how do you
do this?
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ANSI escape sequences
• String sequences
• Perform operations in the terminal
• Control the cursor’s position, change colour of text, etc.
• Supported by Unix operating systems
• Support from Windows 10
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Modifying text
print("Hello, world!") "Hello, world!"
Output
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Modifying text
print("\u{1B}[31mHello, world!") "Hello, world!"
Output
Start
Sequence
Red
colour
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Modifying text
print("\u{1B}[1;31mHello, world!") "Hello, world!"
Output
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Don’t give up just yet…
https://github.com/pakLebah/ANSITerminal
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Modifying text
print("Hello, world!") "Hello, world!"
Output
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Modifying text
import ANSITerminal
print("Hello, world!")
"Hello, world!"
Output
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Modifying text
"Hello, world!"
Output
import ANSITerminal
print("Hello, world!".red)
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Modifying text
"Hello, world!"
Output
import ANSITerminal
print("Hello, world!".red.bold)
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"Hello, world!"
▋
Output
Moving the cursor
print("Hello World!")
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"Hello, world!"▋
Output
Moving the cursor
import ANSITerminal
write("Hello World!")
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"Hello, world!"▋
Output
Moving the cursor
import ANSITerminal
let startPosition = readCursorPos()
write("Hello World!")
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▋"Hello, world!"
Output
Moving the cursor
import ANSITerminal
let startPosition = readCursorPos()
write("Hello World!")
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▋"Hello, world!"
Output
Moving the cursor
import ANSITerminal
let startPosition = readCursorPos()
write("Hello World!")
moveTo(startPosition.row, startPosition.col)
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▋"Hello, world!"
Output
Moving the cursor
import ANSITerminal
let startPosition = readCursorPos()
write("Hello World!".foreColor(244))
moveTo(startPosition.row, startPosition.col)
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"Hello▋ world!"
Output
Moving the cursor
import ANSITerminal
let startPosition = readCursorPos()
write("Hello World!".foreColor(244))
moveTo(startPosition.row, startPosition.col)
write("Hello")
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⚠
Something to consider
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Someone, probably all the time!
“It’s not you, it’s Xcode!”
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🤩
The terminal is your BFF
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An interactive
component
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I’ve been
porting Clack
to Swift
https://github.com/polpielladev/clack-swift
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Let’s build a Text Input component
• Custom text entry
• Placeholder
• Validation
• Support for secure text entry
• Headless + UI
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Headless first
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import Foundation
import ANSITerminal
func readTextInput(
validate: (String)
->
Bool = { _ in true },
validationFailed: ()
->
Void = {},
onNewCharacter: (Character)
->
Void,
onDelete: (Int, Int)
->
Void,
removePlaceholder: ()
->
Void,
showPlaceholder: ()
->
Void
)
- >
String {
}
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import Foundation
import ANSITerminal
func readTextInput(
validate: (String)
->
Bool = { _ in true },
validationFailed: ()
->
Void = {},
onNewCharacter: (Character)
->
Void,
onDelete: (Int, Int)
->
Void,
removePlaceholder: ()
->
Void,
showPlaceholder: ()
->
Void
)
- >
String {
}
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import Foundation
import ANSITerminal
func readTextInput(
validate: (String)
->
Bool = { _ in true },
validationFailed: ()
->
Void = {},
onNewCharacter: (Character)
->
Void,
onDelete: (Int, Int)
->
Void,
removePlaceholder: ()
->
Void,
showPlaceholder: ()
->
Void
)
- >
String {
}
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import Foundation
import ANSITerminal
func readTextInput(
validate: (String)
->
Bool = { _ in true },
validationFailed: ()
->
Void = {},
onNewCharacter: (Character)
->
Void,
onDelete: (Int, Int)
->
Void,
removePlaceholder: ()
->
Void,
showPlaceholder: ()
->
Void
)
- >
String {
}
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var output = ""
while true {
clearBuffer()
if keyPressed() {
let char = readChar()
if char
==
NonPrintableChar.enter.char() {
if validate(output) {
break
} else {
validationFailed()
}
} else if char
==
NonPrintableChar.del.char() {
let cursorPosition = readCursorPos()
if output.count > 0 {
onDelete(cursorPosition.row, cursorPosition.col - 1)
_ = output.removeLast()
}
if output.count
==
0 { showPlaceholder() }
}
if !isNonPrintable(char: char) {
if output.isEmpty { removePlaceholder() }
onNewCharacter(char)
output.append(char)
}
}
}
return output
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var output = ""
while true {
clearBuffer()
if keyPressed() {
let char = readChar()
if char
==
NonPrintableChar.enter.char() {
if validate(output) {
break
} else {
validationFailed()
}
} else if char
==
NonPrintableChar.del.char() {
let cursorPosition = readCursorPos()
if output.count > 0 {
onDelete(cursorPosition.row, cursorPosition.col - 1)
_ = output.removeLast()
}
if output.count
==
0 { showPlaceholder() }
}
if !isNonPrintable(char: char) {
if output.isEmpty { removePlaceholder() }
onNewCharacter(char)
output.append(char)
}
}
}
return output
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var output = ""
while true {
clearBuffer()
if keyPressed() {
let char = readChar()
if char
==
NonPrintableChar.enter.char() {
if validate(output) {
break
} else {
validationFailed()
}
} else if char
==
NonPrintableChar.del.char() {
let cursorPosition = readCursorPos()
if output.count > 0 {
onDelete(cursorPosition.row, cursorPosition.col - 1)
_ = output.removeLast()
}
if output.count
==
0 { showPlaceholder() }
}
if !isNonPrintable(char: char) {
if output.isEmpty { removePlaceholder() }
onNewCharacter(char)
output.append(char)
}
}
}
return output
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var output = ""
while true {
clearBuffer()
if keyPressed() {
let char = readChar()
if char
==
NonPrintableChar.enter.char() {
if validate(output) {
break
} else {
validationFailed()
}
} else if char
==
NonPrintableChar.del.char() {
let cursorPosition = readCursorPos()
if output.count > 0 {
onDelete(cursorPosition.row, cursorPosition.col - 1)
_ = output.removeLast()
}
if output.count
==
0 { showPlaceholder() }
}
if !isNonPrintable(char: char) {
if output.isEmpty { removePlaceholder() }
onNewCharacter(char)
output.append(char)
}
}
}
return output
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var output = ""
while true {
clearBuffer()
if keyPressed() {
let char = readChar()
if char
==
NonPrintableChar.enter.char() {
if validate(output) {
break
} else {
validationFailed()
}
} else if char
==
NonPrintableChar.del.char() {
let cursorPosition = readCursorPos()
if output.count > 0 {
onDelete(cursorPosition.row, cursorPosition.col - 1)
_ = output.removeLast()
}
if output.count
==
0 { showPlaceholder() }
}
if !isNonPrintable(char: char) {
if output.isEmpty { removePlaceholder() }
onNewCharacter(char)
output.append(char)
}
}
}
return output
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var output = ""
while true {
clearBuffer()
if keyPressed() {
let char = readChar()
if char
==
NonPrintableChar.enter.char() {
if validate(output) {
break
} else {
validationFailed()
}
} else if char
==
NonPrintableChar.del.char() {
let cursorPosition = readCursorPos()
if output.count > 0 {
onDelete(cursorPosition.row, cursorPosition.col - 1)
_ = output.removeLast()
}
if output.count
==
0 { showPlaceholder() }
}
if !isNonPrintable(char: char) {
if output.isEmpty { removePlaceholder() }
onNewCharacter(char)
output.append(char)
}
}
}
return output
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var output = ""
while true {
clearBuffer()
if keyPressed() {
let char = readChar()
if char
==
NonPrintableChar.enter.char() {
if validate(output) {
break
} else {
validationFailed()
}
} else if char
==
NonPrintableChar.del.char() {
let cursorPosition = readCursorPos()
if output.count > 0 {
onDelete(cursorPosition.row, cursorPosition.col - 1)
_ = output.removeLast()
}
if output.count
==
0 { showPlaceholder() }
}
if !isNonPrintable(char: char) {
if output.isEmpty { removePlaceholder() }
onNewCharacter(char)
output.append(char)
}
}
}
return output
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Adding the head!
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let textInput = readTextInput(validate: { !$0.isEmpty },
validationFailed: {
validationFailed = true
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, ANSIChar.warn)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 11)
writeAt(bottomPos.row, bottomPos.col + 1, validator
?.
failureString
??
"")
moveTo(currentPosition.row, currentPosition.col)
},
onNewCharacter: { char in
if validationFailed {
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, "◆".foreColor(81).bold)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 81)
moveTo(bottomPos.row, bottomPos.col + 1)
clearToEndOfLine()
moveTo(currentPosition.row, currentPosition.col)
validationFailed = false
}
write("\(isSecureEntry ? "▪" : char)")
},
onDelete: { row, col in moveTo(row, col); deleteChar() },
removePlaceholder: {
moveTo(initialCursorPosition.row, initialCursorPosition.col)
clearToEndOfLine()
},
showPlaceholder: {
write(placeholder.foreColor(244))
moveTo(initialCursorPosition.row, initialCursorPosition.col)
})
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let textInput = readTextInput(validate: { !$0.isEmpty },
validationFailed: {
validationFailed = true
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, ANSIChar.warn)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 11)
writeAt(bottomPos.row, bottomPos.col + 1, validator
?.
failureString
??
"")
moveTo(currentPosition.row, currentPosition.col)
},
onNewCharacter: { char in
if validationFailed {
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, "◆".foreColor(81).bold)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 81)
moveTo(bottomPos.row, bottomPos.col + 1)
clearToEndOfLine()
moveTo(currentPosition.row, currentPosition.col)
validationFailed = false
}
write("\(isSecureEntry ? "▪" : char)")
},
onDelete: { row, col in moveTo(row, col); deleteChar() },
removePlaceholder: {
moveTo(initialCursorPosition.row, initialCursorPosition.col)
clearToEndOfLine()
},
showPlaceholder: {
write(placeholder.foreColor(244))
moveTo(initialCursorPosition.row, initialCursorPosition.col)
})
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let textInput = readTextInput(validate: { !$0.isEmpty },
validationFailed: {
validationFailed = true
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, ANSIChar.warn)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 11)
writeAt(bottomPos.row, bottomPos.col + 1, validator
?.
failureString
??
"")
moveTo(currentPosition.row, currentPosition.col)
},
onNewCharacter: { char in
if validationFailed {
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, "◆".foreColor(81).bold)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 81)
moveTo(bottomPos.row, bottomPos.col + 1)
clearToEndOfLine()
moveTo(currentPosition.row, currentPosition.col)
validationFailed = false
}
write("\(isSecureEntry ? "▪" : char)")
},
onDelete: { row, col in moveTo(row, col); deleteChar() },
removePlaceholder: {
moveTo(initialCursorPosition.row, initialCursorPosition.col)
clearToEndOfLine()
},
showPlaceholder: {
write(placeholder.foreColor(244))
moveTo(initialCursorPosition.row, initialCursorPosition.col)
})
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let textInput = readTextInput(validate: { !$0.isEmpty },
validationFailed: {
validationFailed = true
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, ANSIChar.warn)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 11)
writeAt(bottomPos.row, bottomPos.col + 1, validator
?.
failureString
??
"")
moveTo(currentPosition.row, currentPosition.col)
},
onNewCharacter: { char in
if validationFailed {
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, "◆".foreColor(81).bold)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 81)
moveTo(bottomPos.row, bottomPos.col + 1)
clearToEndOfLine()
moveTo(currentPosition.row, currentPosition.col)
validationFailed = false
}
write("\(isSecureEntry ? "▪" : char)")
},
onDelete: { row, col in moveTo(row, col); deleteChar() },
removePlaceholder: {
moveTo(initialCursorPosition.row, initialCursorPosition.col)
clearToEndOfLine()
},
showPlaceholder: {
write(placeholder.foreColor(244))
moveTo(initialCursorPosition.row, initialCursorPosition.col)
})
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let textInput = readTextInput(validate: { !$0.isEmpty },
validationFailed: {
validationFailed = true
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, ANSIChar.warn)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 11)
writeAt(bottomPos.row, bottomPos.col + 1, validator
?.
failureString
??
"")
moveTo(currentPosition.row, currentPosition.col)
},
onNewCharacter: { char in
if validationFailed {
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, "◆".foreColor(81).bold)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 81)
moveTo(bottomPos.row, bottomPos.col + 1)
clearToEndOfLine()
moveTo(currentPosition.row, currentPosition.col)
validationFailed = false
}
write("\(isSecureEntry ? "▪" : char)")
},
onDelete: { row, col in moveTo(row, col); deleteChar() },
removePlaceholder: {
moveTo(initialCursorPosition.row, initialCursorPosition.col)
clearToEndOfLine()
},
showPlaceholder: {
write(placeholder.foreColor(244))
moveTo(initialCursorPosition.row, initialCursorPosition.col)
})
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let textInput = readTextInput(validate: { !$0.isEmpty },
validationFailed: {
validationFailed = true
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, ANSIChar.warn)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 11)
writeAt(bottomPos.row, bottomPos.col + 1, validator
?.
failureString
??
"")
moveTo(currentPosition.row, currentPosition.col)
},
onNewCharacter: { char in
if validationFailed {
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, "◆".foreColor(81).bold)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 81)
moveTo(bottomPos.row, bottomPos.col + 1)
clearToEndOfLine()
moveTo(currentPosition.row, currentPosition.col)
validationFailed = false
}
write("\(isSecureEntry ? "▪" : char)")
},
onDelete: { row, col in moveTo(row, col); deleteChar() },
removePlaceholder: {
moveTo(initialCursorPosition.row, initialCursorPosition.col)
clearToEndOfLine()
},
showPlaceholder: {
write(placeholder.foreColor(244))
moveTo(initialCursorPosition.row, initialCursorPosition.col)
})
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let textInput = readTextInput(validate: { !$0.isEmpty },
validationFailed: {
validationFailed = true
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, ANSIChar.warn)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 11)
writeAt(bottomPos.row, bottomPos.col + 1, validator
?.
failureString
??
"")
moveTo(currentPosition.row, currentPosition.col)
},
onNewCharacter: { char in
if validationFailed {
let currentPosition = readCursorPos()
writeAt(promptStartLine, 0, "◆".foreColor(81).bold)
updateBracketColor(fromLine: promptStartLine, toLine: bottomPos.row, withColor: 81)
moveTo(bottomPos.row, bottomPos.col + 1)
clearToEndOfLine()
moveTo(currentPosition.row, currentPosition.col)
validationFailed = false
}
write("\(isSecureEntry ? "▪" : char)")
},
onDelete: { row, col in moveTo(row, col); deleteChar() },
removePlaceholder: {
moveTo(initialCursorPosition.row, initialCursorPosition.col)
clearToEndOfLine()
},
showPlaceholder: {
write("sk-
...
".foreColor(244))
moveTo(initialCursorPosition.row, initialCursorPosition.col)
})
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🤯
That’s literally it!
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💪
Leverage the power of Unicode!
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Ora’s spinners are made of braille pattern
characters
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clack-swift is open
source!
https://github.com/polpielladev/clack-swift
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An example
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No content
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struct Auth: AsyncParsableCommand {
func run() async throws {
intro(title: "Hi! Set your token to use Chatty!")
let validator = Validator(
validate: { !$0.isEmpty },
failureString: "The OpenAI API token can not be empty
...
"
)
let token = text(
question: "Enter your OpenAPI token",
placeholder: "sk-
...
",
validator: validator,
isSecureEntry: true
)
let keychain = Keychain(service: "dev.polpiella.chatty")
keychain["openaitoken"] = token
outro(
text: "You're all set! You can now run "
+ "`chatty`".magenta.onWhite
+ " to converse
...
"
)
}
}
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struct Auth: AsyncParsableCommand {
func run() async throws {
intro(title: "Hi! 👋 Set your token to use Chatty!")
let validator = Validator(
validate: { !$0.isEmpty },
failureString: "The OpenAI API token can not be empty
...
"
)
let token = text(
question: "Enter your OpenAPI token",
placeholder: "sk-
...
",
validator: validator,
isSecureEntry: true
)
let keychain = Keychain(service: "dev.polpiella.chatty")
keychain["openaitoken"] = token
outro(
text: "You're all set! You can now run "
+ "`chatty`".magenta.onWhite
+ " to converse
...
"
)
}
}
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struct Auth: AsyncParsableCommand {
func run() async throws {
intro(title: "Hi! 👋 Set your token to use Chatty!")
let validator = Validator(
validate: { !$0.isEmpty },
failureString: "The OpenAI API token can not be empty
...
"
)
let token = text(
question: "Enter your OpenAPI token",
placeholder: "sk-
...
",
validator: validator,
isSecureEntry: true
)
let keychain = Keychain(service: "dev.polpiella.chatty")
keychain["openaitoken"] = token
outro(
text: "You're all set! You can now run "
+ "`chatty`".magenta.onWhite
+ " to converse
...
"
)
}
}
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struct Auth: AsyncParsableCommand {
func run() async throws {
intro(title: "Hi! 👋 Set your token to use Chatty!")
let validator = Validator(
validate: { !$0.isEmpty },
failureString: "The OpenAI API token can not be empty
...
"
)
let token = text(
question: "Enter your OpenAPI token",
placeholder: "sk-
...
",
validator: validator,
isSecureEntry: true
)
let keychain = Keychain(service: "dev.polpiella.chatty")
keychain["openaitoken"] = token
outro(
text: "You're all set! You can now run "
+ "`chatty`".magenta.onWhite
+ " to converse
...
"
)
}
}
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struct Auth: AsyncParsableCommand {
func run() async throws {
intro(title: "Hi! 👋 Set your token to use Chatty!")
let validator = Validator(
validate: { !$0.isEmpty },
failureString: "The OpenAI API token can not be empty
...
"
)
let token = text(
question: "Enter your OpenAPI token",
placeholder: "sk-
...
",
validator: validator,
isSecureEntry: true
)
let keychain = Keychain(service: "dev.polpiella.chatty")
keychain["openaitoken"] = token
outro(
text: "✅ You're all set! You can now run "
+ "`chatty`".magenta.onWhite
+ " to converse
...
"
)
}
}
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intro()
text()
outro()
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🤩
Chatty-cli is open source!
https://github.com/polpielladev/chatty-cli
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Say hi!
https://pol.link