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comparison mercurial/ui.py @ 6302:8e3dc3de7e73

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Use the pager given by the environment to display long output Unix systems usually have a PAGER environment variable set. If it is set, mercurial will use the pager application to display output. Two configuration variables are available to influence the behaviour of the pager. ui.pager sets the pager application. The pager is only used if ui.usepager is true. By default ui.usepager is disabled.
author David Soria Parra <dsp@php.net>
date Tue, 18 Mar 2008 22:12:34 +0100
parents ffaf2419de44
children 577a7da1d44b
comparison
equal deleted inserted replaced
6301:68cfd7d208a5 6302:8e3dc3de7e73
29 def __init__(self, verbose=False, debug=False, quiet=False, 29 def __init__(self, verbose=False, debug=False, quiet=False,
30 interactive=True, traceback=False, report_untrusted=True, 30 interactive=True, traceback=False, report_untrusted=True,
31 parentui=None): 31 parentui=None):
32 self.overlay = None 32 self.overlay = None
33 self.buffers = [] 33 self.buffers = []
34 self.pager = None
34 if parentui is None: 35 if parentui is None:
35 # this is the parent of all ui children 36 # this is the parent of all ui children
36 self.parentui = None 37 self.parentui = None
37 self.quiet = quiet 38 self.quiet = quiet
38 self.verbose = verbose 39 self.verbose = verbose
62 self.overlay = dupconfig(self.parentui.overlay) 63 self.overlay = dupconfig(self.parentui.overlay)
63 64
64 def __getattr__(self, key): 65 def __getattr__(self, key):
65 return getattr(self.parentui, key) 66 return getattr(self.parentui, key)
66 67
68 def __del__(self):
69 if self.pager:
70 try:
71 self.pager.close()
72 except IOException:
73 # we might get into an broken pipe if the users quit
74 # the pager before we finished io
75 pass
76
67 def isatty(self): 77 def isatty(self):
68 if ui._isatty is None: 78 if ui._isatty is None:
69 ui._isatty = sys.stdin.isatty() 79 ui._isatty = sys.stdin.isatty()
70 return ui._isatty 80 return ui._isatty
71 81
368 378
369 def popbuffer(self): 379 def popbuffer(self):
370 return "".join(self.buffers.pop()) 380 return "".join(self.buffers.pop())
371 381
372 def write(self, *args): 382 def write(self, *args):
383 """Write to a pager if available, otherwise to stdout"""
373 if self.buffers: 384 if self.buffers:
374 self.buffers[-1].extend([str(a) for a in args]) 385 self.buffers[-1].extend([str(a) for a in args])
375 else: 386 else:
387 if self.getpager() and not self.pager:
388 self.pager = os.popen(self.getpager(), "w")
389 sys.stderr = self.pager
390 sys.stdout = self.pager
376 for a in args: 391 for a in args:
377 sys.stdout.write(str(a)) 392 sys.stdout.write(str(a))
378 393
379 def write_err(self, *args): 394 def write_err(self, *args):
380 try: 395 try:
476 return (os.environ.get("HGEDITOR") or 491 return (os.environ.get("HGEDITOR") or
477 self.config("ui", "editor") or 492 self.config("ui", "editor") or
478 os.environ.get("VISUAL") or 493 os.environ.get("VISUAL") or
479 os.environ.get("EDITOR", "vi")) 494 os.environ.get("EDITOR", "vi"))
480 495
496 def getpager(self):
497 '''return a pager'''
498 if self.configbool("ui", "usepager", False):
499 return (self.config("ui", "pager")
500 or os.environ.get("PAGER"))