Note of TTY-dependent output

README.md

@@ -72,9 +72,10 @@ will be used for all network connections.
 
 The general output format of the launcher can be changed using the `--output <mode>` with
 one of the following modes:
-- `human`: Human readable output, translated messages, formatted tables and tasks.
-- `human-color`: Default, same as `human` but with some color where relevant, like tasks 
-  states and game logs.
+- `human`: Human readable output, translated messages, formatted tables and tasks, 
+  default if stdout if not a TTY.
+- `human-color`: Same as `human` but with some color where relevant, like tasks states
+  and game logs, default if stdout is a TTY.
 - `machine`: Machine
 
 The verbosity of the launcher can be adjusted if you encounter issues, using multiple 

portablemc/cli/lang.py

@@ -46,7 +46,7 @@ def get(key: str, **kwargs) -> str:
         "saves, screenshots (and resources for legacy versions), it also store "
         "runtime binaries and authentication.",
     "args.timeout": "Set a global timeout (in decimal seconds) for network requests.",
-    "args.output": "Set the output format of the launcher, defaults to human-color.",
+    "args.output": "Set the output format of the launcher, defaults to human-color, human if not a TTY.",
     "args.verbose": "Enable verbose output. The more -v argument you put, the more verbose the launcher will be, depending on subcommands' support (usually -v, -vv, -vvv).",
     # Args common langs
     "args.common.help": "Show this help message and exit.",