An OS X Framework for command line scripting in Swift. It supports joining together shell commands and Swift functions, like the pipe in UNIX shell commands and the pipe forward operator in F#. As Swift itself it supports both object-oriented and functional programming.

Usage

Shell commands return readable streams, which can be read all at once with "read()" or read lazily (as in piece by piece) with "readSome()". The latter is useful for long texts.

#!/usr/bin/env swiftshell

import SwiftShell

let result = run("some shell command").read()

For in-line commands, use $("command").

print( "The time and date is " + $("date -u") )

Pipe several commands together

run("echo piped to the next command") |> run("wc -w") |> writeTo(standardoutput)

Read a file line by line

for line in open(filename).lines() {
	// Do something with each line
}

List all executables in PATH

let directories = environment["PATH"]!.split(":")
for directory in directories {
	run("find \"\(directory)\" -type f -perm +ugo+x -print") |> writeTo(standardoutput)
}

or more Functionally:

environment["PATH"]! |> split(":") 
	|> map { dir in run("find \"\(dir)\" -type f -perm +ugo+x -print") } 
	|> writeTo(standardoutput)

Print standard input with line numbers

var i = 1
for line in standardinput.lines() {
	print("line \(i++): ")
	println(line)
}

var i = 1
standardinput.lines() |> map {line in "line \(i++): \(line)\n"} |> writeTo(standardoutput)

Launch with e.g. ls | print_linenumbers.swift

Scripts

trash.swift: moves files and folders to the trash.

Installation

In the Terminal, go to where you want to download SwiftShell.

Run

  git clone https://github.com/kareman/SwiftShell.git 
  cd SwiftShell

Copy/link Div/swiftshell to your bin folder or anywhere in your PATH.
To install the framework itself, either:
- run xcodebuild install from the project's root folder. This will install the SwiftShell framework in ~/Library/Frameworks.
- or run xcodebuild and copy the resulting framework from the build folder to your library folder of choice. If that is not "~/Library/Frameworks", "/Library/Frameworks" or a folder mentioned in the $DYLD_FRAMEWORK_PATH environment variable then you need to add your folder to $DYLD_FRAMEWORK_PATH.

NOTE: Code compiled with optimisations turned on (anything but "SWIFT_OPTIMIZATION_LEVEL = -Onone") crashes when reading from streams. SwiftShell is therefore compiled with the “Debug” configuration by default.

LICENSE

Released under the MIT License (MIT), http://opensource.org/licenses/MIT

Kåre Morstøl, NotTooBad Software