Bug #275047 - Split _emerge/__init__.py into smaller pieces (part 2).

Thanks to Sebastian Mingramm (few) <s.mingramm@gmx.de> for this patch.

svn path=/main/trunk/; revision=13667

1 files changed, 80 insertions, 0 deletions

diff --git a/pym/_emerge/stdout_spinner.py b/pym/_emerge/stdout_spinner.py
new file mode 100644
index 000000000..1f49a6850
--- /dev/null
+++ b/pym/_emerge/stdout_spinner.py
@@ -0,0 +1,80 @@
+import platform
+import sys
+import time
+
+from portage.output import darkgreen, green
+
+class stdout_spinner(object):
+	scroll_msgs = [
+		"Gentoo Rocks ("+platform.system()+")",
+		"Thank you for using Gentoo. :)",
+		"Are you actually trying to read this?",
+		"How many times have you stared at this?",
+		"We are generating the cache right now",
+		"You are paying too much attention.",
+		"A theory is better than its explanation.",
+		"Phasers locked on target, Captain.",
+		"Thrashing is just virtual crashing.",
+		"To be is to program.",
+		"Real Users hate Real Programmers.",
+		"When all else fails, read the instructions.",
+		"Functionality breeds Contempt.",
+		"The future lies ahead.",
+		"3.1415926535897932384626433832795028841971694",
+		"Sometimes insanity is the only alternative.",
+		"Inaccuracy saves a world of explanation.",
+	]
+
+	twirl_sequence = "/-\\|/-\\|/-\\|/-\\|\\-/|\\-/|\\-/|\\-/|"
+
+	def __init__(self):
+		self.spinpos = 0
+		self.update = self.update_twirl
+		self.scroll_sequence = self.scroll_msgs[
+			int(time.time() * 100) % len(self.scroll_msgs)]
+		self.last_update = 0
+		self.min_display_latency = 0.05
+
+	def _return_early(self):
+		"""
+		Flushing ouput to the tty too frequently wastes cpu time. Therefore,
+		each update* method should return without doing any output when this
+		method returns True.
+		"""
+		cur_time = time.time()
+		if cur_time - self.last_update < self.min_display_latency:
+			return True
+		self.last_update = cur_time
+		return False
+
+	def update_basic(self):
+		self.spinpos = (self.spinpos + 1) % 500
+		if self._return_early():
+			return
+		if (self.spinpos % 100) == 0:
+			if self.spinpos == 0:
+				sys.stdout.write(". ")
+			else:
+				sys.stdout.write(".")
+		sys.stdout.flush()
+
+	def update_scroll(self):
+		if self._return_early():
+			return
+		if(self.spinpos >= len(self.scroll_sequence)):
+			sys.stdout.write(darkgreen(" \b\b\b" + self.scroll_sequence[
+				len(self.scroll_sequence) - 1 - (self.spinpos % len(self.scroll_sequence))]))
+		else:
+			sys.stdout.write(green("\b " + self.scroll_sequence[self.spinpos]))
+		sys.stdout.flush()
+		self.spinpos = (self.spinpos + 1) % (2 * len(self.scroll_sequence))
+
+	def update_twirl(self):
+		self.spinpos = (self.spinpos + 1) % len(self.twirl_sequence)
+		if self._return_early():
+			return
+		sys.stdout.write("\b\b " + self.twirl_sequence[self.spinpos])
+		sys.stdout.flush()
+
+	def update_quiet(self):
+		return