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(;module:
[lux #- not]
(lux (control functor
applicative
monad)
(data (coll (list #as list #open ("List/" Monoid<List> Monad<List>)))
(text #as text #open ("Text/" Monoid<Text>))
error
(sum #as sum))
[io]
[macro #+ with-gensyms Functor<Lux> Monad<Lux>]
(macro [ast]
["s" syntax #+ syntax: Syntax])))
## [Types]
(type: #export (CLI a)
{#;doc "A command-line interface parser."}
(-> (List Text) (Error [(List Text) a])))
## [Utils]
(def: (run' opt inputs)
(All [a] (-> (CLI a) (List Text) (Error [(List Text) a])))
(opt inputs))
## [Structures]
(struct: #export _ (Functor CLI)
(def: (map f ma inputs)
(case (ma inputs)
(#;Left msg) (#;Left msg)
(#;Right [inputs' datum]) (#;Right [inputs' (f datum)]))))
(struct: #export _ (Applicative CLI)
(def: functor Functor<CLI>)
(def: (wrap a inputs)
(#;Right [inputs a]))
(def: (apply ff fa inputs)
(case (ff inputs)
(#;Right [inputs' f])
(case (fa inputs')
(#;Right [inputs'' a])
(#;Right [inputs'' (f a)])
(#;Left msg)
(#;Left msg))
(#;Left msg)
(#;Left msg))
))
(struct: #export _ (Monad CLI)
(def: applicative Applicative<CLI>)
(def: (join mma inputs)
(case (mma inputs)
(#;Left msg) (#;Left msg)
(#;Right [inputs' ma]) (ma inputs'))))
## [Combinators]
(def: #export any
{#;doc "Just returns the next input without applying any logic."}
(CLI Text)
(function [inputs]
(case inputs
(#;Cons arg inputs')
(#;Right [inputs' arg])
_
(#;Left "Cannot parse empty arguments."))))
(def: #export (parse parser)
{#;doc "Parses the next input with a parsing function."}
(All [a] (-> (-> Text (Error a)) (CLI a)))
(function [inputs]
(case inputs
(#;Cons arg inputs')
(case (parser arg)
(#;Right value)
(#;Right [inputs' value])
(#;Left parser-error)
(#;Left parser-error))
_
(#;Left "Cannot parse empty arguments."))))
(def: #export (option names)
{#;doc "Checks that a given option (with multiple possible names) has a value."}
(-> (List Text) (CLI Text))
(function [inputs]
(let [[pre post] (list;split-with (. ;not (list;member? text;Eq<Text> names)) inputs)]
(case post
#;Nil
(#;Left ($_ Text/append "Missing option (" (text;join-with " " names) ")"))
(^ (list& _ value post'))
(#;Right [(List/append pre post') value])
_
(#;Left ($_ Text/append "Option lacks value (" (text;join-with " " names) ")"))
))))
(def: #export (flag names)
{#;doc "Checks that a given flag (with multiple possible names) is set."}
(-> (List Text) (CLI Bool))
(function [inputs]
(let [[pre post] (list;split-with (. ;not (list;member? text;Eq<Text> names)) inputs)]
(case post
#;Nil
(#;Right [pre false])
(#;Cons _ post')
(#;Right [(List/append pre post') true])))))
(def: #export end
{#;doc "Ensures there are no more inputs."}
(CLI Unit)
(function [inputs]
(case inputs
#;Nil (#;Right [inputs []])
_ (#;Left (Text/append "Unknown parameters: " (text;join-with " " inputs))))))
(def: #export (after param subject)
(All [p s] (-> (CLI p) (CLI s) (CLI s)))
(do Monad<CLI>
[_ param]
subject))
(def: #export (before param subject)
(All [p s] (-> (CLI p) (CLI s) (CLI s)))
(do Monad<CLI>
[output subject
_ param]
(wrap output)))
(def: #export (assert message test)
{#;doc "Fails with the given message if the test is false."}
(-> Text Bool (CLI Unit))
(function [inputs]
(if test
(#;Right [inputs []])
(#;Left message))))
(def: #export (opt opt)
{#;doc "Optionality combinator."}
(All [a]
(-> (CLI a) (CLI (Maybe a))))
(function [inputs]
(case (opt inputs)
(#;Left _) (#;Right [inputs #;None])
(#;Right [inputs' x]) (#;Right [inputs' (#;Some x)]))))
(def: #export (seq optL optR)
{#;doc "Sequencing combinator."}
(All [a b] (-> (CLI a) (CLI b) (CLI [a b])))
(do Monad<CLI>
[l optL
r optR]
(wrap [l r])))
(def: #export (alt optL optR)
{#;doc "Heterogeneous alternative combinator."}
(All [a b] (-> (CLI a) (CLI b) (CLI (| a b))))
(function [inputs]
(case (optL inputs)
(#;Left msg)
(case (optR inputs)
(#;Left _)
(#;Left msg)
(#;Right [inputs' r])
(#;Right [inputs' (sum;right r)]))
(#;Right [inputs' l])
(#;Right [inputs' (sum;left l)]))))
(def: #export (not opt)
{#;doc "The opposite of the given CLI."}
(All [a] (-> (CLI a) (CLI Unit)))
(function [inputs]
(case (opt inputs)
(#;Left msg)
(#;Right [inputs []])
_
(#;Left "Expected to fail; yet succeeded."))))
(def: #export (some opt)
{#;doc "0-or-more combinator."}
(All [a]
(-> (CLI a) (CLI (List a))))
(function [inputs]
(case (opt inputs)
(#;Left _) (#;Right [inputs (list)])
(#;Right [inputs' x]) (run' (do Monad<CLI>
[xs (some opt)]
(wrap (list& x xs)))
inputs'))))
(def: #export (many opt)
{#;doc "1-or-more combinator."}
(All [a]
(-> (CLI a) (CLI (List a))))
(do Monad<CLI>
[x opt
xs (some opt)]
(wrap (list& x xs))))
(def: #export (either pl pr)
{#;doc "Homogeneous alternative combinator."}
(All [a]
(-> (CLI a) (CLI a) (CLI a)))
(function [inputs]
(case (pl inputs)
(#;Left _) (pr inputs)
output output)))
(def: #export (run opt inputs)
(All [a] (-> (CLI a) (List Text) (Error a)))
(case (opt inputs)
(#;Left msg)
(#;Left msg)
(#;Right [_ value])
(#;Right value)))
## [Syntax]
(type: Program-Args
(#Raw-Program-Args Text)
(#Parsed-Program-Args (List [AST AST])))
(def: program-args^
(Syntax Program-Args)
(s;alt s;local-symbol
(s;form (s;some (s;either (do s;Monad<Syntax>
[name s;local-symbol]
(wrap [(ast;symbol ["" name]) (` any)]))
(s;tuple (s;seq s;any s;any)))))))
(syntax: #export (program: [args program-args^] body)
{#;doc (doc "Defines the entry-point to a program (similar to the \"main\" function/method in other programming languages)."
"Can take a list of all the input parameters to the program, or can destructure them using CLI-option combinators from the lux/cli module."
(program: all-args
(do Monad<IO>
[foo init-program
bar (do-something all-args)]
(wrap [])))
(program: (name)
(io (log! (Text/append "Hello, " name))))
(program: ([config config^])
(do Monad<IO>
[data (init-program config)]
(do-something data))))}
(case args
(#Raw-Program-Args args)
(wrap (list (` (;_lux_program (~ (ast;symbol ["" args]))
(~ body)))))
(#Parsed-Program-Args args)
(with-gensyms [g!args g!_ g!output g!message]
(wrap (list (` (;_lux_program (~ g!args)
(case ((: (;;CLI (io;IO Unit))
(do ;;Monad<CLI>
[(~@ (|> args
(List/map (function [[binding parser]]
(list binding parser)))
List/join))
(~ g!_) ;;end]
((~' wrap) (~ body))))
(~ g!args))
(#;Right [(~ g!_) (~ g!output)])
(~ g!output)
(#;Left (~ g!message))
(error! (~ g!message))
)))
)))
))
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