Merge pull request #487 from asciinema/log-on-stderr

Print all user/diagnostic messages to stderr

.pre-commit-config.yaml

@@ -15,7 +15,7 @@ repos:
     hooks:
       - id: isort
   - repo: https://github.com/psf/black
-    rev: 22.1.0
+    rev: 22.3.0
     hooks:
       - id: black
   - repo: https://github.com/adrienverge/yamllint

asciinema/commands/command.py

@@ -1,6 +1,6 @@
 import os
 import sys
-from typing import Any, Dict, TextIO
+from typing import Any, Dict, Optional
 
 from ..api import Api
 from ..config import Config
@@ -14,31 +14,21 @@ class Command:
     def print(
         self,
         text: str,
-        file_: TextIO = sys.stdout,
         end: str = "\n",
+        color: Optional[int] = None,
         force: bool = False,
     ) -> None:
         if not self.quiet or force:
-            print(text, file=file_, end=end)
+            if color is not None and os.isatty(sys.stderr.fileno()):
+                text = f"\x1b[0;3{color}m{text}\x1b[0m"
+
+            print(text, file=sys.stderr, end=end)
 
     def print_info(self, text: str) -> None:
-        if os.isatty(sys.stdout.fileno()):
-            self.print(f"\x1b[0;32masciinema: {text}\x1b[0m")
-        else:
-            self.print(f"asciinema: {text}")
+        self.print(f"asciinema: {text}", color=2)
 
     def print_warning(self, text: str) -> None:
-        if os.isatty(sys.stdout.fileno()):
-            self.print(f"\x1b[0;33masciinema: {text}\x1b[0m")
-        else:
-            self.print(f"asciinema: {text}")
+        self.print(f"asciinema: {text}", color=3)
 
     def print_error(self, text: str) -> None:
-        if os.isatty(sys.stderr.fileno()):
-            self.print(
-                f"\x1b[0;31masciinema: {text}\x1b[0m",
-                file_=sys.stderr,
-                force=True,
-            )
-        else:
-            self.print(f"asciinema: {text}", file_=sys.stderr, force=True)
+        self.print(f"asciinema: {text}", color=1, force=True)