fix: cli: accept --conf with no command

hledger/Hledger/Cli.hs

@@ -140,10 +140,10 @@ mainmode addons = defMode {
  ,modeGroupFlags = Group {
      -- flags in named groups: (keep synced with Hledger.Cli.CliOptions.highlightHelp)
      groupNamed = cligeneralflagsgroups1
-     -- flags in the unnamed group, shown last:
-    ,groupUnnamed = confflags   -- keep synced with dropUnsupportedOpts
-     -- flags handled but not shown in the help:
-    ,groupHidden = hiddenflags
+     -- flags in the unnamed group, shown last: (keep synced with dropUnsupportedOpts)
+    ,groupUnnamed = confflags
+     -- other flags handled but not shown in help:
+    ,groupHidden = hiddenflagsformainmode
     }
  ,modeHelpSuffix = []
     -- "Examples:" :

hledger/Hledger/Cli/CliOptions.hs

@@ -27,6 +27,7 @@ module Hledger.Cli.CliOptions (
   flattreeflags,
   confflags,
   hiddenflags,
+  hiddenflagsformainmode,
   -- outputflags,
   outputFormatFlag,
   outputFileFlag,
@@ -267,10 +268,9 @@ confflags = [
   ,flagNone ["no-conf","n"] (setboolopt "no-conf") "ignore any config file"
   ]
 
--- | Common flags that are accepted but not shown in --help,
--- such as --effective, --aux-date.
-hiddenflags :: [Flag RawOpts]
-hiddenflags = [
+-- | Common legacy flags that are accepted but not shown in --help.
+hiddenflagsformainmode :: [Flag RawOpts]
+hiddenflagsformainmode = [
    flagNone ["effective","aux-date"] (setboolopt "date2") "Ledger-compatible aliases for --date2"
   ,flagNone ["infer-value"]          (setboolopt "infer-market-prices") "legacy flag that was renamed"
   ,flagNone ["pretty-tables"]        (setopt "pretty" "always") "legacy flag that was renamed"
@@ -278,7 +278,10 @@ hiddenflags = [
   ,flagNone ["obfuscate"]            (setboolopt "obfuscate") "slightly obfuscate hledger's output. Warning, does not give privacy. Formerly --anon."  -- #2133, handled by maybeObfuscate
   ,flagReq  ["rules-file"]           (\s opts -> Right $ setopt "rules" s opts) "RULESFILE" "was renamed to --rules"
   ]
-  ++ confflags -- repeated here so subcommands/addons won't error when parsing them
+
+-- Subcommands/addons add the conf flags, so they won't error if those are present.
+hiddenflags :: [Flag RawOpts]
+hiddenflags = hiddenflagsformainmode ++ confflags
 
 -- | Common output-related flags: --output-file, --output-format...
 

hledger/test/cli/cli.test

@@ -114,25 +114,29 @@ $ hledger --no-conf check -f/dev/null
 # ** 15. --conf CONFFILE works with builtin commands.
 $ hledger --conf /dev/null check -f/dev/null
 
-# ** 16. When moving options written before the command name:
+# ** 16. --conf works with no command.
+$ hledger --conf /dev/null
+> /Commands/
+
+# ** 17. When moving options written before the command name:
 # if the flag name is used in general options and also one or more commands,
 # the general option's arity determines whether a value is expected.
 # Here -p is a help command flag taking no value, but also a general option requiring a value,
 # so the value ("today") is detected.
 $ hledger -p today check -f/dev/null
 
-# ** 17. The specially-handled --debug option is also moved properly, with no value:
+# ** 18. The specially-handled --debug option is also moved properly, with no value:
 $ hledger --debug check -f/dev/null
 >2 //
 
-# ** 18. a joined value:
+# ** 19. a joined value:
 $ hledger --debug=1 check -f/dev/null
 >2 //
 
-# ** 19. or a separate value:
+# ** 20. or a separate value:
 $ hledger --debug 1 check -f/dev/null
 >2 //
 
-# ** 20. A short flag with joined value, or multiple valueless short flags joined together, are moved properly.
+# ** 21. A short flag with joined value, or multiple valueless short flags joined together, are moved properly.
 $ hledger -f/dev/null -BI check
 >2 //