# ============================================================================
# File: gundo.py
# Description: vim global plugin to visualize your undo tree
# Maintainer: Steve Losh <steve@stevelosh.com>
# License: GPLv2+ -- look it up.
# Notes: Much of this code was thiefed from Mercurial, and the rest was
# heavily inspired by scratch.vim and histwin.vim.
#
# ============================================================================
import difflib
import itertools
import sys
import time
import vim
# Mercurial's graphlog code --------------------------------------------------------
def asciiedges(seen, rev, parents):
"""adds edge info to changelog DAG walk suitable for ascii()"""
if rev not in seen:
seen.append(rev)
nodeidx = seen.index(rev)
knownparents = []
newparents = []
for parent in parents:
if parent in seen:
knownparents.append(parent)
else:
newparents.append(parent)
ncols = len(seen)
seen[nodeidx:nodeidx + 1] = newparents
edges = [(nodeidx, seen.index(p)) for p in knownparents]
if len(newparents) > 0:
edges.append((nodeidx, nodeidx))
if len(newparents) > 1:
edges.append((nodeidx, nodeidx + 1))
nmorecols = len(seen) - ncols
return nodeidx, edges, ncols, nmorecols
def get_nodeline_edges_tail(
node_index, p_node_index, n_columns, n_columns_diff, p_diff, fix_tail):
if fix_tail and n_columns_diff == p_diff and n_columns_diff != 0:
# Still going in the same non-vertical direction.
if n_columns_diff == -1:
start = max(node_index + 1, p_node_index)
tail = ["|", " "] * (start - node_index - 1)
tail.extend(["/", " "] * (n_columns - start))
return tail
else:
return ["\\", " "] * (n_columns - node_index - 1)
else:
return ["|", " "] * (n_columns - node_index - 1)
def draw_edges(edges, nodeline, interline):
for (start, end) in edges:
if start == end + 1:
interline[2 * end + 1] = "/"
elif start == end - 1:
interline[2 * start + 1] = "\\"
elif start == end:
interline[2 * start] = "|"
else:
nodeline[2 * end] = "+"
if start > end:
(start, end) = (end, start)
for i in range(2 * start + 1, 2 * end):
if nodeline[i] != "+":
nodeline[i] = "-"
def fix_long_right_edges(edges):
for (i, (start, end)) in enumerate(edges):
if end > start:
edges[i] = (start, end + 1)
def ascii(buf, state, type, char, text, coldata):
"""prints an ASCII graph of the DAG
takes the following arguments (one call per node in the graph):
- Somewhere to keep the needed state in (init to asciistate())
- Column of the current node in the set of ongoing edges.
- Type indicator of node data == ASCIIDATA.
- Payload: (char, lines):
- Character to use as node's symbol.
- List of lines to display as the node's text.
- Edges; a list of (col, next_col) indicating the edges between
the current node and its parents.
- Number of columns (ongoing edges) in the current revision.
- The difference between the number of columns (ongoing edges)
in the next revision and the number of columns (ongoing edges)
in the current revision. That is: -1 means one column removed;
0 means no columns added or removed; 1 means one column added.
"""
idx, edges, ncols, coldiff = coldata
assert -2 < coldiff < 2
if coldiff == -1:
# Transform
#
# | | | | | |
# o | | into o---+
# |X / |/ /
# | | | |
fix_long_right_edges(edges)
# add_padding_line says whether to rewrite
#
# | | | | | | | |
# | o---+ into | o---+
# | / / | | | # <--- padding line
# o | | | / /
# o | |
add_padding_line = (len(text) > 2 and coldiff == -1 and
[x for (x, y) in edges if x + 1 < y])
# fix_nodeline_tail says whether to rewrite
#
# | | o | | | | o | |
# | | |/ / | | |/ /
# | o | | into | o / / # <--- fixed nodeline tail
# | |/ / | |/ /
# o | | o | |
fix_nodeline_tail = len(text) <= 2 and not add_padding_line
# nodeline is the line containing the node character (typically o)
nodeline = ["|", " "] * idx
nodeline.extend([char, " "])
nodeline.extend(
get_nodeline_edges_tail(idx, state[1], ncols, coldiff,
state[0], fix_nodeline_tail))
# shift_interline is the line containing the non-vertical
# edges between this entry and the next
shift_interline = ["|", " "] * idx
if coldiff == -1:
n_spaces = 1
edge_ch = "/"
elif coldiff == 0:
n_spaces = 2
edge_ch = "|"
else:
n_spaces = 3
edge_ch = "\\"
shift_interline.extend(n_spaces * [" "])
shift_interline.extend([edge_ch, " "] * (ncols - idx - 1))
# draw edges from the current node to its parents
draw_edges(edges, nodeline, shift_interline)
# lines is the list of all graph lines to print
lines = [nodeline]
if add_padding_line:
lines.append(get_padding_line(idx, ncols, edges))
lines.append(shift_interline)
# make sure that there are as many graph lines as there are
# log strings
while len(text) < len(lines):
text.append("")
if len(lines) < len(text):
extra_interline = ["|", " "] * (ncols + coldiff)
while len(lines) < len(text):
lines.append(extra_interline)
# print lines
indentation_level = max(ncols, ncols + coldiff)
for (line, logstr) in zip(lines, text):
ln = "%-*s %s" % (2 * indentation_level, "".join(line), logstr)
buf.write(ln.rstrip() + '\n')
# ... and start over
state[0] = coldiff
state[1] = idx
def generate(dag, edgefn, current):
seen, state = [], [0, 0]
buf = Buffer()
for node, parents in list(dag):
if node.time:
age_label = age(int(node.time))
else:
age_label = 'Original'
line = '[%s] %s' % (node.n, age_label)
if node.n == current:
char = '@'
else:
char = 'o'
ascii(buf, state, 'C', char, [line], edgefn(seen, node, parents))
return buf.b
# Mercurial age function -----------------------------------------------------------
agescales = [("year", 3600 * 24 * 365),
("month", 3600 * 24 * 30),
("week", 3600 * 24 * 7),
("day", 3600 * 24),
("hour", 3600),
("minute", 60),
("second", 1)]
def age(ts):
'''turn a timestamp into an age string.'''
def plural(t, c):
if c == 1:
return t
return t + "s"
def fmt(t, c):
return "%d %s" % (c, plural(t, c))
now = time.time()
then = ts
if then > now:
return 'in the future'
delta = max(1, int(now - then))
if delta > agescales[0][1] * 2:
return time.strftime('%Y-%m-%d', time.gmtime(float(ts)))
for t, s in agescales:
n = delta // s
if n >= 2 or s == 1:
return '%s ago' % fmt(t, n)
# Python Vim utility functions -----------------------------------------------------
normal = lambda s: vim.command('normal %s' % s)
MISSING_BUFFER = "Cannot find Gundo's target buffer (%s)"
MISSING_WINDOW = "Cannot find window (%s) for Gundo's target buffer (%s)"
def _check_sanity():
'''Check to make sure we're not crazy.
Does the following things:
* Make sure the target buffer still exists.
'''
b = int(vim.eval('g:gundo_target_n'))
if not vim.eval('bufloaded(%d)' % b):
vim.command('echo "%s"' % (MISSING_BUFFER % b))
return False
w = int(vim.eval('bufwinnr(%d)' % b))
if w == -1:
vim.command('echo "%s"' % (MISSING_WINDOW % (w, b)))
return False
return True
def _goto_window_for_buffer(b):
w = int(vim.eval('bufwinnr(%d)' % int(b)))
vim.command('%dwincmd w' % w)
def _goto_window_for_buffer_name(bn):
b = vim.eval('bufnr("%s")' % bn)
return _goto_window_for_buffer(b)
def _undo_to(n):
n = int(n)
if n == 0:
vim.command('silent earlier %s' % (int(vim.eval('&undolevels')) + 1))
else:
vim.command('silent undo %d' % n)
INLINE_HELP = '''\
" Gundo for %s (%d)
" j/k - move between undo states
" p - preview diff of selected and current states
" <cr> - revert to selected state
'''
# Python undo tree data structures and functions -----------------------------------
class Buffer(object):
def __init__(self):
self.b = ''
def write(self, s):
self.b += s
class Node(object):
def __init__(self, n, parent, time, curhead):
self.n = int(n)
self.parent = parent
self.children = []
self.curhead = curhead
self.time = time
def _make_nodes(alts, nodes, parent=None):
p = parent
for alt in alts:
curhead = 'curhead' in alt
node = Node(n=alt['seq'], parent=p, time=alt['time'], curhead=curhead)
nodes.append(node)
if alt.get('alt'):
_make_nodes(alt['alt'], nodes, p)
p = node
def make_nodes():
ut = vim.eval('undotree()')
entries = ut['entries']
root = Node(0, None, False, 0)
nodes = []
_make_nodes(entries, nodes, root)
nodes.append(root)
nmap = dict((node.n, node) for node in nodes)
return nodes, nmap
def changenr(nodes):
_curhead_l = list(itertools.dropwhile(lambda n: not n.curhead, nodes))
if _curhead_l:
current = _curhead_l[0].parent.n
else:
current = int(vim.eval('changenr()'))
return current
# Gundo rendering ------------------------------------------------------------------
# Rendering utility functions
def _fmt_time(t):
return time.strftime('%Y-%m-%d %I:%M:%S %p', time.localtime(float(t)))
def _output_preview_text(lines):
_goto_window_for_buffer_name('__Gundo_Preview__')
vim.command('setlocal modifiable')
vim.current.buffer[:] = lines
vim.command('setlocal nomodifiable')
def _generate_preview_diff(current, node_before, node_after):
_goto_window_for_buffer(vim.eval('g:gundo_target_n'))
if not node_after.n: # we're at the original file
before_lines = []
_undo_to(0)
after_lines = vim.current.buffer[:]
before_name = 'n/a'
before_time = ''
after_name = 'Original'
after_time = ''
elif not node_before.n: # we're at a pseudo-root state
_undo_to(0)
before_lines = vim.current.buffer[:]
_undo_to(node_after.n)
after_lines = vim.current.buffer[:]
before_name = 'Original'
before_time = ''
after_name = node_after.n
after_time = _fmt_time(node_after.time)
else:
_undo_to(node_before.n)
before_lines = vim.current.buffer[:]
_undo_to(node_after.n)
after_lines = vim.current.buffer[:]
before_name = node_before.n
before_time = _fmt_time(node_before.time)
after_name = node_after.n
after_time = _fmt_time(node_after.time)
_undo_to(current)
return list(difflib.unified_diff(before_lines, after_lines,
before_name, after_name,
before_time, after_time))
def _generate_change_preview_diff(current, node_before, node_after):
_goto_window_for_buffer(vim.eval('g:gundo_target_n'))
_undo_to(node_before.n)
before_lines = vim.current.buffer[:]
_undo_to(node_after.n)
after_lines = vim.current.buffer[:]
before_name = node_before.n or 'Original'
before_time = node_before.time and _fmt_time(node_before.time) or ''
after_name = node_after.n or 'Original'
after_time = node_after.time and _fmt_time(node_after.time) or ''
_undo_to(current)
return list(difflib.unified_diff(before_lines, after_lines,
before_name, after_name,
before_time, after_time))
def GundoRenderGraph():
if not _check_sanity():
return
nodes, nmap = make_nodes()
for node in nodes:
node.children = [n for n in nodes if n.parent == node]
def walk_nodes(nodes):
for node in nodes:
if node.parent:
yield (node, [node.parent])
else:
yield (node, [])
dag = sorted(nodes, key=lambda n: int(n.n), reverse=True)
current = changenr(nodes)
result = generate(walk_nodes(dag), asciiedges, current).rstrip().splitlines()
result = [' ' + l for l in result]
target = (vim.eval('g:gundo_target_f'), int(vim.eval('g:gundo_target_n')))
if int(vim.eval('g:gundo_help')):
header = (INLINE_HELP % target).splitlines()
else:
header = []
vim.command('call s:GundoOpenGraph()')
vim.command('setlocal modifiable')
vim.current.buffer[:] = (header + result)
vim.command('setlocal nomodifiable')
i = 1
for line in result:
try:
line.split('[')[0].index('@')
i += 1
break
except ValueError:
pass
i += 1
vim.command('%d' % (i+len(header)-1))
def GundoRenderPreview():
if not _check_sanity():
return
target_state = vim.eval('s:GundoGetTargetState()')
# Check that there's an undo state. There may not be if we're talking about
# a buffer with no changes yet.
if target_state == None:
_goto_window_for_buffer_name('__Gundo__')
return
else:
target_state = int(target_state)
_goto_window_for_buffer(vim.eval('g:gundo_target_n'))
nodes, nmap = make_nodes()
current = changenr(nodes)
node_after = nmap[target_state]
node_before = node_after.parent
vim.command('call s:GundoOpenPreview()')
_output_preview_text(_generate_preview_diff(current, node_before, node_after))
_goto_window_for_buffer_name('__Gundo__')
def GundoRenderChangePreview():
if not _check_sanity():
return
target_state = vim.eval('s:GundoGetTargetState()')
# Check that there's an undo state. There may not be if we're talking about
# a buffer with no changes yet.
if target_state == None:
_goto_window_for_buffer_name('__Gundo__')
return
else:
target_state = int(target_state)
_goto_window_for_buffer(vim.eval('g:gundo_target_n'))
nodes, nmap = make_nodes()
current = changenr(nodes)
node_after = nmap[target_state]
node_before = nmap[current]
vim.command('call s:GundoOpenPreview()')
_output_preview_text(_generate_change_preview_diff(current, node_before, node_after))
_goto_window_for_buffer_name('__Gundo__')
# Gundo undo/redo
def GundoRevert():
if not _check_sanity():
return
target_n = int(vim.eval('s:GundoGetTargetState()'))
back = vim.eval('g:gundo_target_n')
_goto_window_for_buffer(back)
_undo_to(target_n)
vim.command('GundoRenderGraph')
_goto_window_for_buffer(back)
if int(vim.eval('g:gundo_close_on_revert')):
vim.command('GundoToggle')
def GundoPlayTo():
if not _check_sanity():
return
target_n = int(vim.eval('s:GundoGetTargetState()'))
back = int(vim.eval('g:gundo_target_n'))
delay = int(vim.eval('g:gundo_playback_delay'))
vim.command('echo "%s"' % back)
_goto_window_for_buffer(back)
normal('zR')
nodes, nmap = make_nodes()
start = nmap[changenr(nodes)]
end = nmap[target_n]
def _walk_branch(origin, dest):
rev = origin.n < dest.n
nodes = []
if origin.n > dest.n:
current, final = origin, dest
else:
current, final = dest, origin
while current.n >= final.n:
if current.n == final.n:
break
nodes.append(current)
current = current.parent
else:
return None
nodes.append(current)
if rev:
return reversed(nodes)
else:
return nodes
branch = _walk_branch(start, end)
if not branch:
vim.command('unsilent echo "No path to that node from here!"')
return
for node in branch:
_undo_to(node.n)
vim.command('GundoRenderGraph')
normal('zz')
_goto_window_for_buffer(back)
vim.command('redraw')
vim.command('sleep %dm' % delay)
def initPythonModule():
if sys.version_info[:2] < (2, 4):
vim.command('let s:has_supported_python = 0')