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struct FishCompletionsGenerator {
static func generateCompletionScript(_ type: ParsableCommand.Type) -> String {
let programName = type._commandName
let helperFunctions = [
preprocessorFunction(commandName: programName),
helperFunction(commandName: programName)
]
let completions = generateCompletions(commandChain: [programName], [type])
return helperFunctions.joined(separator: "\n\n") + "\n\n" + completions.joined(separator: "\n")
}
}
// MARK: - Private functions
extension FishCompletionsGenerator {
private static func generateCompletions(commandChain: [String], _ commands: [ParsableCommand.Type]) -> [String] {
let type = commands.last!
let isRootCommand = commands.count == 1
let programName = commandChain[0]
var subcommands = type.configuration.subcommands
.filter { $0.configuration.shouldDisplay }
if !subcommands.isEmpty && isRootCommand {
subcommands.append(HelpCommand.self)
}
let helperFunctionName = helperFunctionName(commandName: programName)
var prefix = "complete -c \(programName) -n '\(helperFunctionName) \"\(commandChain.joined(separator: separator))\""
if !subcommands.isEmpty {
prefix += " \"\(subcommands.map { $0._commandName }.joined(separator: separator))\""
}
prefix += "'"
func complete(suggestion: String) -> String {
"\(prefix) \(suggestion)"
}
let subcommandCompletions: [String] = subcommands.map { subcommand in
let escapedAbstract = subcommand.configuration.abstract.fishEscape()
let suggestion = "-f -a '\(subcommand._commandName)' -d '\(escapedAbstract)'"
return complete(suggestion: suggestion)
}
let argumentCompletions = commands
.argumentsForHelp(visibility: .default)
.compactMap { $0.argumentSegments(commandChain) }
.map { $0.joined(separator: " ") }
.map { complete(suggestion: $0) }
let completionsFromSubcommands = subcommands.flatMap { subcommand in
generateCompletions(commandChain: commandChain + [subcommand._commandName], [subcommand])
}
return completionsFromSubcommands + argumentCompletions + subcommandCompletions
}
}
extension ArgumentDefinition {
fileprivate func argumentSegments(_ commandChain: [String]) -> [String]? {
guard help.visibility.base == .default,
!names.isEmpty
else { return nil }
var results = names.map{ $0.asFishSuggestion }
if !help.abstract.isEmpty {
results += ["-d '\(help.abstract.fishEscape())'"]
}
if isNullary {
return results
}
switch completion.kind {
case .default: return results
case .list(let list):
return results + ["-r -f -k -a '\(list.joined(separator: " "))'"]
case .file(let extensions):
let pattern = "*.{\(extensions.joined(separator: ","))}"
return results + ["-r -f -a '(for i in \(pattern); echo $i;end)'"]
case .directory:
return results + ["-r -f -a '(__fish_complete_directories)'"]
case .shellCommand(let shellCommand):
return results + ["-r -f -a '(\(shellCommand))'"]
case .custom:
let program = commandChain[0]
let subcommands = commandChain.dropFirst().joined(separator: " ")
return results + ["-r -f -a '(command \(program) ---completion \(subcommands) -- --custom (commandline -opc)[1..-1])'"]
}
}
}
extension Name {
fileprivate var asFishSuggestion: String {
switch self {
case .long(let longName):
return "-l \(longName)"
case .short(let shortName, _):
return "-s \(shortName)"
case .longWithSingleDash(let dashedName):
return "-o \(dashedName)"
}
}
}
extension String {
fileprivate func fishEscape() -> String {
replacingOccurrences(of: "'", with: #"\'"#)
}
}
extension FishCompletionsGenerator {
private static var separator: String { " " }
private static func preprocessorFunctionName(commandName: String) -> String {
"_swift_\(commandName)_preprocessor"
}
private static func preprocessorFunction(commandName: String) -> String {
"""
# A function which filters options which starts with "-" from $argv.
function \(preprocessorFunctionName(commandName: commandName))
set -l results
for i in (seq (count $argv))
switch (echo $argv[$i] | string sub -l 1)
case '-'
case '*'
echo $argv[$i]
end
end
end
"""
}
private static func helperFunctionName(commandName: String) -> String {
"_swift_" + commandName + "_using_command"
}
private static func helperFunction(commandName: String) -> String {
let functionName = helperFunctionName(commandName: commandName)
let preprocessorFunctionName = preprocessorFunctionName(commandName: commandName)
return """
function \(functionName)
set -l currentCommands (\(preprocessorFunctionName) (commandline -opc))
set -l expectedCommands (string split \"\(separator)\" $argv[1])
set -l subcommands (string split \"\(separator)\" $argv[2])
if [ (count $currentCommands) -ge (count $expectedCommands) ]
for i in (seq (count $expectedCommands))
if [ $currentCommands[$i] != $expectedCommands[$i] ]
return 1
end
end
if [ (count $currentCommands) -eq (count $expectedCommands) ]
return 0
end
if [ (count $subcommands) -gt 1 ]
for i in (seq (count $subcommands))
if [ $currentCommands[(math (count $expectedCommands) + 1)] = $subcommands[$i] ]
return 1
end
end
end
return 0
end
return 1
end
"""
}
}
|
