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Added the help command to stanza. #50

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Added the help command to stanza. #50

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46 changes: 25 additions & 21 deletions compiler/stz-arg-parser.stanza
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Original file line number Diff line number Diff line change
Expand Up @@ -10,35 +10,37 @@ defpackage stz/arg-parser :

public defstruct Command :
name: String
args: Maybe<String>
description: String
flags: Collection<Flag>
action: ParseResult -> ?

public defn MarkerFlag (name:String) :
Flag(name, 0, 0, true, false)
public defn MarkerFlag (name:String, description:String) :
Flag(name, description, 0, 0, List(), true, false)

public defn GreedyFlag (name:String, optional?:True|False) :
Flag(name, 1, 1, optional?, true)

public defn SingleFlag (name:String, optional?:True|False) :
Flag(name, 1, 1, optional?, false)
public defn GreedyFlag (name:String, description:String, arg-name:String, optional?:True|False) :
Flag(name, description, 1, 1, List(arg-name), optional?, true)

public defn SingleFlag (name:String) :
SingleFlag(name, false)
public defn SingleFlag (name:String, description:String, arg-name:String, optional?:True|False) :
Flag(name, description, 1, 1, List(arg-name) optional?, false)

public defn MultipleFlag (name:String, min:Int, max:Int, optional?:True|False) :
Flag(name, min, max, optional?, false)
public defn SingleFlag (name:String, description:String, arg-name:String) :
SingleFlag(name, description, arg-name, false)

public defn MultipleFlag (name:String, min:Int, optional?:True|False) :
Flag(name, min, INT-MAX, optional?, false)
public defn MultipleFlag (name:String, description:String, min:Int, max:Int, arg-names:List<String>, optional?:True|False) :
Flag(name, description, min, max, arg-names, optional?, false)

public defn MultipleFlag (name:String, min:Int) :
Flag(name, min, INT-MAX, false, false)
public defn MultipleFlag (name:String, description:String, min:Int, arg-name:String, optional?:True|False) :
Flag(name, description, min, INT-MAX, List(arg-name), optional?, false)

public defn MultipleFlag (name:String, optional?:True|False) :
Flag(name, 0, INT-MAX, optional?, false)
public defn MultipleFlag (name:String, description:String, min:Int, arg-name:String) :
Flag(name, description, min, INT-MAX, List(arg-name), false, false)

public defn MultipleFlag (name:String) :
Flag(name, 0, INT-MAX, false, false)
public defn MultipleFlag (name:String, description:String, arg-name:String, optional?:True|False) :
Flag(name, description, 0, INT-MAX, List(arg-name) optional?, false)

public defn MultipleFlag (name:String, description:String, arg-name:String) :
Flag(name, description, 0, INT-MAX, List(arg-name), false, false)

public deftype ParseResult
public defmulti command (r:ParseResult) -> String
Expand All @@ -49,7 +51,7 @@ public defmulti flag? (r:ParseResult, flag:String) -> String|List<String>|False|
public defn flag?<?D> (r:ParseResult, name:String, default:?D) -> String|List<String>|D|True :
match(flag?(r, name)) :
(f:False) : default
(f:String|List<String>|True) : f
(f:String|List<String>|True) : f

public defn flag (r:ParseResult, name:String) -> String|List<String>|True :
match(flag?(r, name)) :
Expand Down Expand Up @@ -78,8 +80,10 @@ public defn multiple?<?D> (r:ParseResult, name:String, default:?D) :

public defstruct Flag :
name: String
description: String
min-arity: Int
max-arity: Int
arg-names: List<String>
optional?: True|False
eats-next?: True|False

Expand Down Expand Up @@ -240,4 +244,4 @@ defmethod print (o:OutputStream, e:WrongArityFlag) :
defmethod print (o:OutputStream, e:MissingFlag) :
print(o, "Command %_ requires flag -%_." % [name(command(e)), name(flag(e))])
defmethod print (o:OutputStream, e:NoSuchFlag) :
print(o, "Command %_ does not recognize flag -%_." % [name(command(e)), flag(e)])
print(o, "Command %_ does not recognize flag -%_." % [name(command(e)), flag(e)])
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