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Merged
chrisdone-artificial merged 2 commits into from
Nov 10, 2025
Merged

Add subcommand support #109

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4eda3b6
Add subcommand support
Nov 10, 2025
f9b7101
Add some more helpers
Nov 10, 2025
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37 changes: 37 additions & 0 deletions examples/41-commands.hell
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Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
-- --help:
--
-- Usage: <interactive> COMMAND
--
-- Available options:
-- -h,--help Show this help text
--
-- Available commands:
-- add Add the thing
-- remove
-- list

data Command
= Add Text
| Remove Text
| List

parseAdd = Main.Add <$> Options.strArgument (Argument.metavar "FILE" <> Argument.help "File to add")

parseRemove = Main.Remove <$> Options.strArgument (Argument.metavar "FILE" <> Argument.help "File to remove")

parseList = Applicative.pure Main.List

cmdParser =
Options.hsubparser
( Options.command "add" (Options.info Main.parseAdd (Options.progDesc "Add the thing"))
<> Options.command "remove" (Options.info Main.parseRemove Options.fullDesc)
<> Options.command "list" (Options.info Main.parseList Options.fullDesc)
)

main = do
let opts = Options.info (Main.cmdParser <**> Options.helper) Options.fullDesc
cmd <- Options.execParser opts
case cmd of
Add f -> Text.putStrLn $ "Adding " <> f
Remove f -> Text.putStrLn $ "Removing " <> f
List -> Text.putStrLn "Listing files"
13 changes: 13 additions & 0 deletions src/Hell.hs
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Expand Up @@ -2076,12 +2076,16 @@ polyLits =
"Options.flag'" Options.flag' :: forall a. a -> Options.Mod Options.FlagFields a -> Parser a
"Option.long" option_long :: forall a. Text -> Options.Mod Options.OptionFields a
"Option.help" options_help :: forall a. Text -> Options.Mod Options.OptionFields a
"Options.hsubparser" Options.hsubparser :: forall a. Options.Mod Options.CommandFields a -> Parser a
"Options.command" options_command :: forall a. Text -> Options.ParserInfo a -> Options.Mod Options.CommandFields a
"Flag.help" options_help :: forall a. Text -> Options.Mod Options.FlagFields a
"Flag.long" flag_long :: forall a. Text -> Options.Mod Options.FlagFields a
"Option.value" option_value :: forall a. a -> Options.Mod Options.OptionFields a
"Argument.value" argument_value :: forall a. a -> Options.Mod Options.ArgumentFields a
"Argument.metavar" argument_metavar :: forall a. Text -> Options.Mod Options.ArgumentFields a
"Argument.help" options_help :: forall a. Text -> Options.Mod Options.ArgumentFields a
"Options.progDesc" options_progDesc :: forall a. Text -> Options.InfoMod a
"Options.header" options_header :: forall a. Text -> Options.InfoMod a
|]
in toplevel
)
Expand All @@ -2095,12 +2099,21 @@ argument_metavar = Options.metavar . Text.unpack
option_value :: forall a. a -> Options.Mod Options.OptionFields a
option_value = Options.value

options_progDesc :: forall a. Text -> Options.InfoMod a
options_progDesc = Options.progDesc . Text.unpack

options_header :: forall a. Text -> Options.InfoMod a
options_header = Options.header . Text.unpack

argument_value :: forall a. a -> Options.Mod Options.ArgumentFields a
argument_value = Options.value

options_help :: forall f a. Text -> Options.Mod f a
options_help = Options.help . Text.unpack

options_command :: forall a. Text -> Options.ParserInfo a -> Options.Mod Options.CommandFields a
options_command = Options.command . Text.unpack

option_long :: forall a. Text -> Options.Mod Options.OptionFields a
option_long = Options.long . Text.unpack

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