Fix zsh dashes in command names (#284)

Author: adellibovi

Sources/ArgumentParser/Completions/ZshCompletionsGenerator.swift

@@ -17,7 +17,7 @@ struct ZshCompletionsGenerator {
     return """
     #compdef \(type._commandName)
     local context state state_descr line
-    _\(type._commandName)_commandname=$words[1]
+    _\(type._commandName.zshEscapingCommandName())_commandname=$words[1]
     typeset -A opt_args
 
     \(generateCompletionFunction([type]))
@@ -122,6 +122,10 @@ extension String {
   fileprivate func zshEscaped() -> String {
     self.zshEscapingSingleQuotes().zshEscapingMetacharacters()
   }
+  
+  fileprivate func zshEscapingCommandName() -> String {
+    self.replacingOccurrences(of: "-", with: "_")
+  }
 }
 
 extension ArgumentDefinition {

Tests/ArgumentParserUnitTests/CompletionScriptTests.swift

@@ -125,13 +125,13 @@ extension CompletionScriptTests {
 }
 
 extension CompletionScriptTests {
-  struct Escaped: ParsableCommand {
+  struct EscapedCommand: ParsableCommand {
     @Option(help: #"Escaped chars: '[]\."#)
     var one: String
   }
 
   func testEscaped_Zsh() throws {
-    XCTAssertEqual(zshEscapedCompletion, Escaped.completionScript(for: .zsh))
+    XCTAssertEqual(zshEscapedCompletion, EscapedCommand.completionScript(for: .zsh))
   }
 }
 
@@ -213,12 +213,12 @@ complete -F _base base
 """
 
 private let zshEscapedCompletion = """
-#compdef escaped
+#compdef escaped-command
 local context state state_descr line
-_escaped_commandname=$words[1]
+_escaped_command_commandname=$words[1]
 typeset -A opt_args
 
-_escaped() {
+_escaped-command() {
     integer ret=1
     local -a args
     args+=(
@@ -236,7 +236,7 @@ _custom_completion() {
     _describe '' completions
 }
 
-_escaped
+_escaped-command
 """
 
 private let fishBaseCompletions = """