" ============================================================================
" File: gundo.vim
" Description: vim global plugin to visualizer 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.
"
" ============================================================================
"{{{ Init
"if exists('loaded_gundo') || &cp
"finish
"endif
"let loaded_gundo = 1
if !exists('g:gundo_width')
let g:gundo_width = 45
endif
"}}}
"{{{ Movement Mappings
function! s:GundoMoveUp()
call cursor(line('.') - 2, 0)
let line = getline('.')
let idx1 = stridx(line, '@')
let idx2 = stridx(line, 'o')
if idx1 != -1
call cursor(0, idx1 + 1)
else
call cursor(0, idx2 + 1)
endif
let target_line = matchstr(getline("."), '\v\[[0-9]+\]')
let target_num = matchstr(target_line, '\v[0-9]+')
call s:GundoRenderPreview(target_num)
endfunction
function! s:GundoMoveDown()
call cursor(line('.') + 2, 0)
let line = getline('.')
let idx1 = stridx(line, '@')
let idx2 = stridx(line, 'o')
if idx1 != -1
call cursor(0, idx1 + 1)
else
call cursor(0, idx2 + 1)
endif
let target_line = matchstr(getline("."), '\v\[[0-9]+\]')
let target_num = matchstr(target_line, '\v[0-9]+')
call s:GundoRenderPreview(target_num)
endfunction
"}}}
"{{{ Buffer/Window Management
function! s:GundoResizeBuffers(backto)
exe bufwinnr(bufwinnr('__Gundo__')) . "wincmd w"
exe "vertical resize " . g:gundo_width
exe bufwinnr(bufwinnr('__Gundo_Preview__')) . "wincmd w"
exe "vertical resize " . 40
exe a:backto . "wincmd w"
endfunction
function! s:GundoOpenBuffer()
let existing_gundo_buffer = bufnr("__Gundo__")
if existing_gundo_buffer == -1
exe "vnew __Gundo__"
wincmd H
call s:GundoResizeBuffers(winnr())
nnoremap <script> <silent> <buffer> <CR> :call <sid>GundoRevert()<CR>
nnoremap <script> <silent> <buffer> j :call <sid>GundoMoveDown()<CR>
nnoremap <script> <silent> <buffer> k :call <sid>GundoMoveUp()<CR>
else
let existing_gundo_window = bufwinnr(existing_gundo_buffer)
if existing_gundo_window != -1
if winnr() != existing_gundo_window
exe existing_gundo_window . "wincmd w"
endif
else
exe "vsplit +buffer" . existing_gundo_buffer
wincmd H
call s:GundoResizeBuffers(winnr())
endif
endif
endfunction
function! s:GundoToggle()
if expand('%') == "__Gundo__"
quit
exe bufwinnr(bufnr('__Gundo_Preview__')) . "wincmd w"
quit
exe bufwinnr(g:gundo_target_n) . "wincmd w"
else
if expand('%') != "__Gundo_Preview__"
let g:gundo_target_n = bufnr('')
let g:gundo_target_f = @%
endif
call s:GundoOpenPreview()
exe bufwinnr(g:gundo_target_n) . "wincmd w"
GundoRender
let target_line = matchstr(getline("."), '\v\[[0-9]+\]')
let target_num = matchstr(target_line, '\v[0-9]+')
call s:GundoRenderPreview(target_num)
endif
endfunction
function! s:GundoMarkPreviewBuffer()
setlocal buftype=nofile
setlocal bufhidden=hide
setlocal noswapfile
setlocal buflisted
setlocal nomodifiable
setlocal filetype=diff
endfunction
function! s:GundoMarkBuffer()
setlocal buftype=nofile
setlocal bufhidden=hide
setlocal noswapfile
setlocal buflisted
setlocal nomodifiable
setlocal filetype=gundo
setlocal nolist
setlocal nonumber
setlocal norelativenumber
call s:GundoSyntax()
endfunction
function! s:GundoSyntax()
let b:current_syntax = 'gundo'
syn match GundoCurrentLocation '@'
syn match GundoHelp '\v^".*$'
syn match GundoNumberField '\v\[[0-9]+\]'
syn match GundoNumber '\v[0-9]+' contained containedin=GundoNumberField
hi def link GundoCurrentLocation Keyword
hi def link GundoHelp Comment
hi def link GundoNumberField Comment
hi def link GundoNumber Identifier
endfunction
function! s:GundoOpenPreview()
let existing_preview_buffer = bufnr("__Gundo_Preview__")
if existing_preview_buffer == -1
exe "vnew __Gundo_Preview__"
wincmd H
else
let existing_preview_window = bufwinnr(existing_preview_buffer)
if existing_preview_window != -1
if winnr() != existing_preview_window
exe existing_preview_window . "wincmd w"
endif
else
exe "vsplit +buffer" . existing_preview_buffer
wincmd H
endif
endif
endfunction
"}}}
"{{{ Undo/Redo Commands
function! s:GundoRevert()
let target_line = matchstr(getline("."), '\v\[[0-9]+\]')
let target_num = matchstr(target_line, '\v[0-9]+')
let back = bufwinnr(g:gundo_target_n)
exe back . "wincmd w"
exe "undo " . target_num
GundoRender
exe back . "wincmd w"
endfunction
"}}}
"{{{ Mercurial's Graphlog Code
python << ENDPYTHON
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 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):
- buffer to write to
- 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 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)[:-1]:
line = '[%s] %s' % (node.n, age(int(node.time)))
char = '@' if node.n == current else 'o'
ascii(buf, state, 'C', char, [line], edgefn(seen, node, parents))
return buf.b
ENDPYTHON
"}}}
"{{{ Mercurial age function
python << ENDPYTHON
import time
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)
ENDPYTHON
"}}}
"{{{ Python Vim utility functions
python << ENDPYTHON
import vim
normal = lambda s: vim.command('normal %s' % s)
def _goto_window_for_buffer(b):
w = vim.eval('bufwinnr(%d)' % int(b))
vim.command('%dwincmd w' % int(w))
def _goto_window_for_buffer_name(bn):
b = vim.eval('bufnr("%s")' % bn)
_goto_window_for_buffer(b)
ENDPYTHON
"}}}
"{{{ Python undo tree data structures and functions
python << ENDPYTHON
import itertools
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 = True if 'curhead' in alt else False
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(entries):
root = Node(0, None, False, 0)
nodes = []
_make_nodes(entries, nodes, root)
return (root, nodes)
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
ENDPYTHON
"}}}
"{{{ Graph rendering
function! s:GundoRender()
python << ENDPYTHON
ut = vim.eval('undotree()')
entries = ut['entries']
root, nodes = make_nodes(entries)
for node in nodes:
node.children = [n for n in nodes if n.parent == node]
tips = [node for node in nodes if not node.children]
def walk_nodes(nodes):
for node in nodes:
yield(node, [node.parent] if node.parent else [])
dag = sorted(nodes, key=lambda n: int(n.n), reverse=True) + [root]
current = changenr(nodes)
result = generate(walk_nodes(dag), asciiedges, current).splitlines()
result = [' ' + l for l in result]
target = (vim.eval('g:gundo_target_f'), int(vim.eval('g:gundo_target_n')))
INLINE_HELP = ('''\
" Gundo for %s [%d]
" j/k - move between undo states
" <cr> - revert to that state
''' % target).splitlines()
vim.command('GundoOpenBuffer')
vim.command('setlocal modifiable')
vim.command('normal ggdG')
vim.current.buffer[:] = (INLINE_HELP + 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+3))
ENDPYTHON
endfunction
"}}}
"{{{ Preview Rendering
function! s:GundoRenderPreview(target)
python << ENDPYTHON
import difflib
_goto_window_for_buffer(vim.eval('g:gundo_target_n'))
root, nodes = make_nodes(entries)
current = changenr(nodes)
target_n = int(vim.eval('a:target'))
node_after = [node for node in nodes if node.n == target_n][0]
node_before = node_after.parent
vim.command('silent undo %d' % node_before.n)
before = vim.current.buffer[:]
vim.command('silent undo %d' % node_after.n)
after = vim.current.buffer[:]
vim.command('silent undo %d' % current)
_goto_window_for_buffer_name('__Gundo_Preview__')
vim.command('setlocal modifiable')
diff = list(difflib.unified_diff(before, after, node_before.n, node_after.n))
vim.current.buffer[:] = diff
vim.command('setlocal nomodifiable')
_goto_window_for_buffer_name('__Gundo__')
ENDPYTHON
endfunction
"}}}
"{{{ Misc
command! -nargs=0 GundoOpenBuffer call s:GundoOpenBuffer()
command! -nargs=0 GundoToggle call s:GundoToggle()
command! -nargs=0 GundoRender call s:GundoRender()
autocmd BufNewFile __Gundo__ call s:GundoMarkBuffer()
autocmd BufNewFile __Gundo_Preview__ call s:GundoMarkPreviewBuffer()
"}}}