[PATCH] Progress bar extension

[Augie Fackler]

# HG changeset patch
# User Augie Fackler <durin42 at gmail.com>
# Date 1266033212 21600
# Node ID c3e6d5815cd3b421749080d7be7a05a583566168
# Parent  ff875e11a6f8ff288b2e863128e8e6940c46f506
Progress bar extension

diff --git a/hgext/progress.py b/hgext/progress.py
new file mode 100644
--- /dev/null
+++ b/hgext/progress.py
@@ -0,0 +1,182 @@
+# progress.py show progress bars for some actions
+#
+# Copyright (C) 2010 Augie Fackler <durin42 at gmail.com>
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+"""show progress bars for some actions
+
+This extension uses the progress information commands can log with hg
+to draw progres bars that are as informative as possible. Some progress
+bars only offer indeterminate information, while others have a definite
+end point.
+
+The following settings are available::
+
+  [progress]
+  delay = 3 # number of seconds (float) before showing the progress bar
+  refresh = 0.1 # time in seconds between refreshes of the progress bar
+  format = topic bar number # format of the progress bar
+  width = <none> # if set, the maximum width of the progress information
+                 # (that is, min(width, term width) will be used)
+  clear-complete = True # clear the progress bar after it's done
+
+Valid entries for the format field are topic, bar, number, unit, and item.
+item defaults to the last 20 characters of the item, but this can be
+changed by adding either -<num> which would take the last num characters,
+or +<num> for the first num characters.
+"""
+
+import math
+import sys
+import time
+
+from mercurial import extensions
+from mercurial import util
+
+def spacejoin(*args):
+    ret = ''
+    for s in args:
+        if s:
+            if ret:
+                ret += ' '
+            ret += s
+    return ret
+
+class progbar(object):
+    def __init__(self, ui):
+        self.ui = ui
+        self.resetstate()
+
+    def resetstate(self):
+        self.topics = []
+        self.printed = False
+        self.lastprint = time.time() + float(self.ui.config(
+            'progress', 'delay', default=3))
+        self.indetcount = 0
+        self.refresh = float(self.ui.config(
+            'progress', 'refresh', default=0.1))
+        self.order = self.ui.configlist(
+            'progress', 'format',
+            default=['topic', 'bar', 'number'])
+
+    def show(self, topic, pos, item, unit, total):
+        termwidth = self.width()
+        self.printed = True
+        head = ''
+        needprogress = False
+        tail = ''
+        for indicator in self.order:
+            add = ''
+            if indicator == 'topic':
+                add = topic
+            elif indicator == 'number':
+                if total:
+                    add = ('% ' + str(len(str(total))) +
+                           's/%s') % (pos, total)
+                else:
+                    add = str(pos)
+            elif indicator.startswith('item') and item:
+                slice = 'end'
+                if '-' in indicator:
+                    wid = int(indicator.split('-')[1])
+                elif '+' in indicator:
+                    slice = 'beginning'
+                    wid = int(indicator.split('+')[1])
+                else:
+                    wid = 20
+                if slice == 'end':
+                    add = item[-wid:]
+                else:
+                    add = item[:wid]
+                add += (wid - len(add)) * ' '
+            elif indicator == 'bar':
+                add = ''
+                needprogress = True
+            elif indicator == 'unit' and unit:
+                add = unit
+            if not needprogress:
+                head = spacejoin(head, add)
+            else:
+                tail = spacejoin(add, tail)
+        if needprogress:
+            used = 0
+            if head:
+                used += len(head) + 1
+            if tail:
+                used += len(tail) + 1
+            progwidth = termwidth - used - 3
+            if total:
+                amt = pos * progwidth // total
+                bar = '=' * (amt) + ' ' * (progwidth - amt)
+            else:
+                progwidth -= 3
+                self.indetcount += 1
+                # mod the count by twice the width so we can make the
+                # cursor bounce between the right and left sides
+                amt = self.indetcount % (2 * progwidth)
+                amt -= progwidth
+                bar = (' ' * int(progwidth - abs(amt)) + '<=>' +
+                       ' ' * int(abs(amt)))
+            prog = ''.join(('[', bar , ']'))
+            out = spacejoin(head, prog, tail)
+        else:
+            out = spacejoin(head, tail)
+        sys.stdout.write('\r' + out[:termwidth])
+        sys.stdout.flush()
+
+    def clear(self):
+        sys.stdout.write('\r%s\r' % (' ' * self.width()))
+
+    def width(self):
+        tw = util.termwidth()
+        return min(int(self.ui.config('progress', 'width', default=tw)), tw)
+
+    def progress(self, orig, topic, pos, item='', unit='', total=None):
+        now = time.time()
+        if pos is None and self.topics[-1] == topic and self.printed:
+            if self.ui.configbool('progress', 'clear-complete', default=True):
+                self.clear()
+            else:
+                sys.stdout.write('\n')
+            sys.stdout.flush()
+            self.resetstate()
+        elif topic not in self.topics:
+            self.topics.append(topic)
+
+        if now - self.lastprint > 0.1 and topic == self.topics[-1]:
+            self.lastprint = now
+            self.show(topic, pos, item, unit, total)
+        return orig(topic, pos, item=item, unit=unit, total=total)
+
+    def write(self, orig, *args):
+        if self.printed:
+            self.clear()
+        return orig(*args)
+
+sharedprog = None
+
+def uisetup(ui):
+    if ui.interactive() and not ui.debugflag:
+        # we instantiate one globally shared progress bar to avoid
+        # competing progress bars when multiple UI objects get created
+        global sharedprog
+        if not sharedprog:
+            sharedprog = progbar(ui)
+        extensions.wrapfunction(ui, 'progress', sharedprog.progress)
+        extensions.wrapfunction(ui, 'write', sharedprog.write)
+
+def reposetup(ui, repo):
+    uisetup(repo.ui)