terminal.py crash on import

pype/lib/terminal.py

@@ -11,12 +11,6 @@
 # ..---===[[ PyP3 Setup ]]===---...
 #
 import re
-import os
-import sys
-import blessed
-
-
-term = blessed.Terminal()
 
 
 class Terminal:
@@ -28,48 +22,100 @@ class Terminal:
  Using **PYPE_LOG_NO_COLORS** environment variable.
  """
 
- # shortcuts for colorama codes
-
- _SB = term.bold
- _RST = ""
- _LR = term.tomato2
- _LG = term.aquamarine3
- _LB = term.turquoise2
- _LM = term.slateblue2
- _LY = term.gold
- _R = term.red
- _G = term.green
- _B = term.blue
- _C = term.cyan
- _Y = term.yellow
- _W = term.white
-
- # dictionary replacing string sequences with colorized one
- _sdict = {
-
- r">>> ": _SB + _LG + r">>> " + _RST,
- r"!!!(?!\sCRI|\sERR)": _SB + _R + r"!!! " + _RST,
- r"\-\-\- ": _SB + _C + r"--- " + _RST,
- r"\*\*\*(?!\sWRN)": _SB + _LY + r"***" + _RST,
- r"\*\*\* WRN": _SB + _LY + r"*** WRN" + _RST,
- r" \- ": _SB + _LY + r" - " + _RST,
- r"\[ ": _SB + _LG + r"[ " + _RST,
- r"\]": _SB + _LG + r"]" + _RST,
- r"{": _LG + r"{",
- r"}": r"}" + _RST,
- r"\(": _LY + r"(",
- r"\)": r")" + _RST,
- r"^\.\.\. ": _SB + _LR + r"... " + _RST,
- r"!!! ERR: ":
- _SB + _LR + r"!!! ERR: " + _RST,
- r"!!! CRI: ":
- _SB + _R + r"!!! CRI: " + _RST,
- r"(?i)failed": _SB + _LR + "FAILED" + _RST,
- r"(?i)error": _SB + _LR + "ERROR" + _RST
- }
-
- def __init__(self):
- pass
+ # Is Terminal initialized
+ _initialized = False
+ # Use colorized output
+ use_colors = True
+ # Output message replacements mapping - set on initialization
+ _sdict = {}
+
+ @staticmethod
+ def _initialize():
+ """Initialize Terminal class as object.
+
+ First check if colorized output is disabled by environment variable
+ `PYPE_LOG_NO_COLORS` value. By default is colorized output turned on.
+
+ Then tries to import python module that do the colors magic and create
+ it's terminal object. Colorized output is not used if import of python
+ module or terminal object creation fails.
+ """
+ # Mark that Terminal's initialization was already triggered
+ Terminal._initialized = True
+
+ from . import env_value_to_bool
+ use_colors = env_value_to_bool(
+ "PYPE_LOG_NO_COLORS", default=Terminal.use_colors
+ )
+ if not use_colors:
+ Terminal.use_colors = use_colors
+ return
+
+ try:
+ # Try to import `blessed` module and create `Terminal` object
+ import blessed
+ term = blessed.Terminal()
+
+ except Exception:
+ # Do not use colors if crashed
+ Terminal.use_colors = False
+ Terminal.echo(
+ "Module `blessed` failed on import or terminal creation."
+ " Pype terminal won't use colors."
+ )
+ return
+
+ # shortcuts for blessed codes
+ _SB = term.bold
+ _RST = ""
+ _LR = term.tomato2
+ _LG = term.aquamarine3
+ _LB = term.turquoise2
+ _LM = term.slateblue2
+ _LY = term.gold
+ _R = term.red
+ _G = term.green
+ _B = term.blue
+ _C = term.cyan
+ _Y = term.yellow
+ _W = term.white
+
+ # dictionary replacing string sequences with colorized one
+ Terminal._sdict = {
+ r">>> ": _SB + _LG + r">>> " + _RST,
+ r"!!!(?!\sCRI|\sERR)": _SB + _R + r"!!! " + _RST,
+ r"\-\-\- ": _SB + _C + r"--- " + _RST,
+ r"\*\*\*(?!\sWRN)": _SB + _LY + r"***" + _RST,
+ r"\*\*\* WRN": _SB + _LY + r"*** WRN" + _RST,
+ r" \- ": _SB + _LY + r" - " + _RST,
+ r"\[ ": _SB + _LG + r"[ " + _RST,
+ r"\]": _SB + _LG + r"]" + _RST,
+ r"{": _LG + r"{",
+ r"}": r"}" + _RST,
+ r"\(": _LY + r"(",
+ r"\)": r")" + _RST,
+ r"^\.\.\. ": _SB + _LR + r"... " + _RST,
+ r"!!! ERR: ":
+ _SB + _LR + r"!!! ERR: " + _RST,
+ r"!!! CRI: ":
+ _SB + _R + r"!!! CRI: " + _RST,
+ r"(?i)failed": _SB + _LR + "FAILED" + _RST,
+ r"(?i)error": _SB + _LR + "ERROR" + _RST
+ }
+
+ Terminal._SB = _SB
+ Terminal._RST = _RST
+ Terminal._LR = _LR
+ Terminal._LG = _LG
+ Terminal._LB = _LB
+ Terminal._LM = _LM
+ Terminal._LY = _LY
+ Terminal._R = _R
+ Terminal._G = _G
+ Terminal._B = _B
+ Terminal._C = _C
+ Terminal._Y = _Y
+ Terminal._W = _W
 
  @staticmethod
  def _multiple_replace(text, adict):
@@ -123,12 +169,15 @@ def log(message):
 
  """
  T = Terminal
+ if not T._initialized:
+ T._initialize()
+
  # if we dont want colors, just print raw message
- if os.environ.get('PYPE_LOG_NO_COLORS'):
+ if not T.use_colors:
  return message
- else:
- message = re.sub(r'\[(.*)\]', '[ ' + T._SB + T._W +
- r'\1' + T._RST + ' ]', message)
- message = T._multiple_replace(message + T._RST, T._sdict)
 
- return message
+ message = re.sub(r'\[(.*)\]', '[ ' + T._SB + T._W +
+ r'\1' + T._RST + ' ]', message)
+ message = T._multiple_replace(message + T._RST, T._sdict)
+
+ return message