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[![Build Status on Travis](https://travis-ci.org/elves/elvish.svg?branch=master)](https://travis-ci.org/elves/elvish) [![Build Status on Travis](https://travis-ci.org/elves/elvish.svg?branch=master)](https://travis-ci.org/elves/elvish)
This project aims to explore the potentials of the Unix shell. It is a work in This project aims to explore the potentials of the Unix shell. It is a work in
progress; things will change without warning. progress; things will change without warning. The [issues list](https://github.com/elves/elvish/issues) contains many things I'm working on.
The [issues list](https://github.com/elves/elvish/issues) contains many things I'm working on.
## Screenshot ## Screenshot
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## Prebuilt binaries ## Prebuilt binaries
Up-to-date binaries for 64-bit [Linux](https://dl.elvish.io/elvish-linux.tar.gz) and [Mac OS X](https://dl.elvish.io/elvish-osx.tar.gz). Download the archive and install with `sudo tar vxfz elvish-*.tar.gz -C /usr/bin`. Up-to-date binaries for 64-bit [Linux](https://dl.elvish.io/elvish-linux.tar.gz) and [Mac OS X](https://dl.elvish.io/elvish-osx.tar.gz). Install with `sudo tar vxfz elvish-*.tar.gz -C /usr/bin`. See also [Building Elvish](#building-elvish).
See also [Building Elvish](#building-elvish).
## Getting Started ## Getting Started
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* Define aliases like `fn ls { external:ls --color $@ }` * Define aliases like `fn ls { external:ls --color $@ }`
* Elvish remembers which directories you have visisted. Use `dirs` to show the history. `jump x` jumps to the highest-scored directory containing `a`.
* Lists look like `[a b c]`, and maps look like `[&key1=value1 &key2=value2]`. Unlike other shells, lists never expands to multiple words, unless you explicitly splice it by prefixing the variable name with `$@`: * Lists look like `[a b c]`, and maps look like `[&key1=value1 &key2=value2]`. Unlike other shells, lists never expands to multiple words, unless you explicitly splice it by prefixing the variable name with `$@`:
``` ```
~> li=[1 2 3] ~> li=[1 2 3]
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/opt/bin:/bin:/sbin:/usr/bin /opt/bin:/bin:/sbin:/usr/bin
``` ```
* You can manipulate the keybinding through the map `$le:binding`, which is indexed by the mode name and then by the key name. * You can manipulate the keybinding through the map `$le:binding`. For example, this binds Ctrl-L to clearing the terminal: `le:binding[insert][Ctrl-L]={ clear > /dev/tty }` The first indexed is the mode and the same is the key. (Yes, the braces enclose a lambda.)
For example, this binds Ctrl-L to clearing the terminal: `le:binding[insert][Ctrl-L]={ clear > /dev/tty }` (yes, the braces enclose a lambda). Use `put $le:binding` to get a nice (albeit long) view of the current keybinding.
Use `put $le:binding` to get a pretty-printed (albeit long) view of the current keybinding.
* Environment variables live in a separate `env:` namespace and must be explicitly qualified: * Environment variables live in a separate `env:` namespace and must be explicitly qualified:
``` ```
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~> env:PATH=$env:PATH":/bin" ~> env:PATH=$env:PATH":/bin"
``` ```
* There is builtin directory history. Use `dirs` to show the history. `jump x` jumps to the highest-scored directory containing `a`.
* There is no interpolation inside double quotes (yet). Use implicit string concatenation: * There is no interpolation inside double quotes (yet). Use implicit string concatenation:
``` ```
~> name=xiaq ~> name=xiaq
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My name is xiaq. My name is xiaq.
``` ```
* A few arithmetic operations are builtin. However, you need to use prefix notation: * A few floating-point arithmetic operations are builtin. However, you need to use prefix notation:
``` ```
~> + 1 2 ~> + 1 2
▶ 3 ▶ 3
~> mul `+ 1 2` 3 ~> div (mul 2 3) 4
▶ 9 ▶ 1.5
``` ```
* Functions are defined with `fn`. You can name arguments in the definition: Unfortunately we cannot use `*` and `/` in the shell.
* Functions are defined with `fn`. You can name arguments:
``` ```
~> fn square [x]{ ~> fn square [x]{
mul $x $x mul $x $x
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▶ 16 ▶ 16
``` ```
* Output of some builtin commands start with a funny "▶". It is not part of the output itself, but shows that such commands output a stream of values instead of bytes. As such, their internal structures as well as boundaries between valued are preserved. This allows us to manipulate structured data in the shell. * Output of some builtin commands start with a funny "▶". It is not part of the output itself, but shows that such commands output a stream of values instead of bytes. As such, their internal structures as well as boundaries between valued are preserved. This allows us to manipulate structured data in the shell; more on this later.
## More Screenshots: ## More Screenshots: