mirror of https://github.com/vinc/moros.git
64 lines
1.2 KiB
Markdown
64 lines
1.2 KiB
Markdown
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# MOROS Lisp
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A minimalist Lisp interpreter is available in MOROS to extend the capabilities
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of the Shell.
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It started from [Risp][https://github.com/stopachka/risp] and was extended to
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include the seven primitive operators and the two special forms of John
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McCarthy's paper "Recursive Functions of Symbolic Expressions and Their
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Computation by Machine" (1960) and "The Roots of Lisp" (2002) by Paul Graham.
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MOROS Lisp dialect is also inspired by Scheme and Clojure.
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## Seven Primitive Operators
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- `quote` (with the `'` syntax)
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- `atom` (aliased to `atom?`)
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- `eq` (aliased to `eq?`)
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- `car` (aliased to `first`)
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- `cdr` (aliased to `rest`)
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- `cons`
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- `cond`
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## Two Special Forms
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- `label` (aliased to `def`)
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- `lambda` (aliased to `fn`)
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## Additional primitives
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- `defun` (aliased to `defn`)
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- `print`
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## Usage
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The interpreter can be invoked from the shell:
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```
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> lisp
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MOROS Lisp v0.1.0
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> (+ 1 2)
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3
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> (exit)
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```
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And it can execute a file.
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For example a file located in `/tmp/fib.ls` with the following content:
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```lisp
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(label fib
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(lambda (n)
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(cond
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((< n 2) n)
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(true (+ (fib (- n 1)) (fib (- n 2)))))))
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(print (fib 6))
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```
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Would produce the following output:
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```
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> lisp /tmp/fib.ls
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8
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```
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