# Revision graph generator for Mercurial
#
# Copyright 2008 Dirkjan Ochtman <dirkjan@ochtman.nl>
# Copyright 2007 Joel Rosdahl <joel@rosdahl.net>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""supports walking the history as DAGs suitable for graphical output
The most basic format we use is that of::
(id, type, data, [parentids])
The node and parent ids are arbitrary integers which identify a node in the
context of the graph returned. Type is a constant specifying the node type.
Data depends on type.
"""
from __future__ import absolute_import
from .node import nullrev
from . import (
dagop,
smartset,
util,
)
CHANGESET = 'C'
PARENT = 'P'
GRANDPARENT = 'G'
MISSINGPARENT = 'M'
# Style of line to draw. None signals a line that ends and is removed at this
# point. A number prefix means only the last N characters of the current block
# will use that style, the rest will use the PARENT style. Add a - sign
# (so making N negative) and all but the first N characters use that style.
EDGES = {PARENT: '|', GRANDPARENT: ':', MISSINGPARENT: None}
def dagwalker(repo, revs):
"""cset DAG generator yielding (id, CHANGESET, ctx, [parentinfo]) tuples
This generator function walks through revisions (which should be ordered
from bigger to lower). It returns a tuple for each node.
Each parentinfo entry is a tuple with (edgetype, parentid), where edgetype
is one of PARENT, GRANDPARENT or MISSINGPARENT. The node and parent ids
are arbitrary integers which identify a node in the context of the graph
returned.
"""
gpcache = {}
for rev in revs:
ctx = repo[rev]
# partition into parents in the rev set and missing parents, then
# augment the lists with markers, to inform graph drawing code about
# what kind of edge to draw between nodes.
pset = set(p.rev() for p in ctx.parents() if p.rev() in revs)
mpars = [p.rev() for p in ctx.parents()
if p.rev() != nullrev and p.rev() not in pset]
parents = [(PARENT, p) for p in sorted(pset)]
for mpar in mpars:
gp = gpcache.get(mpar)
if gp is None:
# precompute slow query as we know reachableroots() goes
# through all revs (issue4782)
if not isinstance(revs, smartset.baseset):
revs = smartset.baseset(revs)
gp = gpcache[mpar] = sorted(set(dagop.reachableroots(
repo, revs, [mpar])))
if not gp:
parents.append((MISSINGPARENT, mpar))
pset.add(mpar)
else:
parents.extend((GRANDPARENT, g) for g in gp if g not in pset)
pset.update(gp)
yield (ctx.rev(), CHANGESET, ctx, parents)
def nodes(repo, nodes):
"""cset DAG generator yielding (id, CHANGESET, ctx, [parentids]) tuples
This generator function walks the given nodes. It only returns parents
that are in nodes, too.
"""
include = set(nodes)
for node in nodes:
ctx = repo[node]
parents = set((PARENT, p.rev()) for p in ctx.parents()
if p.node() in include)
yield (ctx.rev(), CHANGESET, ctx, sorted(parents))
def colored(dag, repo):
"""annotates a DAG with colored edge information
For each DAG node this function emits tuples::
(id, type, data, (col, color), [(col, nextcol, color)])
with the following new elements:
- Tuple (col, color) with column and color index for the current node
- A list of tuples indicating the edges between the current node and its
parents.
"""
seen = []
colors = {}
newcolor = 1
config = {}
for key, val in repo.ui.configitems('graph'):
if '.' in key:
branch, setting = key.rsplit('.', 1)
# Validation
if setting == "width" and val.isdigit():
config.setdefault(branch, {})[setting] = int(val)
elif setting == "color" and val.isalnum():
config.setdefault(branch, {})[setting] = val
if config:
getconf = util.lrucachefunc(
lambda rev: config.get(repo[rev].branch(), {}))
else:
getconf = lambda rev: {}
for (cur, type, data, parents) in dag:
# Compute seen and next
if cur not in seen:
seen.append(cur) # new head
colors[cur] = newcolor
newcolor += 1
col = seen.index(cur)
color = colors.pop(cur)
next = seen[:]
# Add parents to next
addparents = [p for pt, p in parents if p not in next]
next[col:col + 1] = addparents
# Set colors for the parents
for i, p in enumerate(addparents):
if not i:
colors[p] = color
else:
colors[p] = newcolor
newcolor += 1
# Add edges to the graph
edges = []
for ecol, eid in enumerate(seen):
if eid in next:
bconf = getconf(eid)
edges.append((
ecol, next.index(eid), colors[eid],
bconf.get('width', -1),
bconf.get('color', '')))
elif eid == cur:
for ptype, p in parents:
bconf = getconf(p)
edges.append((
ecol, next.index(p), color,
bconf.get('width', -1),
bconf.get('color', '')))
# Yield and move on
yield (cur, type, data, (col, color), edges)
seen = next
def asciiedges(type, char, state, rev, parents):
"""adds edge info to changelog DAG walk suitable for ascii()"""
seen = state['seen']
if rev not in seen:
seen.append(rev)
nodeidx = seen.index(rev)
knownparents = []
newparents = []
for ptype, parent in parents:
if parent == rev:
# self reference (should only be seen in null rev)
continue
if parent in seen:
knownparents.append(parent)
else:
newparents.append(parent)
state['edges'][parent] = state['styles'].get(ptype, '|')
ncols = len(seen)
width = 1 + ncols * 2
nextseen = seen[:]
nextseen[nodeidx:nodeidx + 1] = newparents
edges = [(nodeidx, nextseen.index(p)) for p in knownparents]
seen[:] = nextseen
while len(newparents) > 2:
# ascii() only knows how to add or remove a single column between two
# calls. Nodes with more than two parents break this constraint so we
# introduce intermediate expansion lines to grow the active node list
# slowly.
edges.append((nodeidx, nodeidx))
edges.append((nodeidx, nodeidx + 1))
nmorecols = 1
width += 2
yield (type, char, width, (nodeidx, edges, ncols, nmorecols))
char = '\\'
nodeidx += 1
ncols += 1
edges = []
del newparents[0]
if len(newparents) > 0:
edges.append((nodeidx, nodeidx))
if len(newparents) > 1:
edges.append((nodeidx, nodeidx + 1))
nmorecols = len(nextseen) - ncols
if nmorecols > 0:
width += 2
# remove current node from edge characters, no longer needed
state['edges'].pop(rev, None)
yield (type, char, width, (nodeidx, edges, ncols, nmorecols))
def _fixlongrightedges(edges):
for (i, (start, end)) in enumerate(edges):
if end > start:
edges[i] = (start, end + 1)
def _getnodelineedgestail(
echars, idx, pidx, ncols, coldiff, pdiff, fix_tail):
if fix_tail and coldiff == pdiff and coldiff != 0:
# Still going in the same non-vertical direction.
if coldiff == -1:
start = max(idx + 1, pidx)
tail = echars[idx * 2:(start - 1) * 2]
tail.extend(["/", " "] * (ncols - start))
return tail
else:
return ["\\", " "] * (ncols - idx - 1)
else:
remainder = (ncols - idx - 1)
return echars[-(remainder * 2):] if remainder > 0 else []
def _drawedges(echars, 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] = echars[2 * start]
else:
if 2 * end >= len(nodeline):
continue
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 _getpaddingline(echars, idx, ncols, edges):
# all edges up to the current node
line = echars[:idx * 2]
# an edge for the current node, if there is one
if (idx, idx - 1) in edges or (idx, idx) in edges:
# (idx, idx - 1) (idx, idx)
# | | | | | | | |
# +---o | | o---+
# | | X | | X | |
# | |/ / | |/ /
# | | | | | |
line.extend(echars[idx * 2:(idx + 1) * 2])
else:
line.extend([' ', ' '])
# all edges to the right of the current node
remainder = ncols - idx - 1
if remainder > 0:
line.extend(echars[-(remainder * 2):])
return line
def _drawendinglines(lines, extra, edgemap, seen):
"""Draw ending lines for missing parent edges
None indicates an edge that ends at between this node and the next
Replace with a short line ending in ~ and add / lines to any edges to
the right.
"""
if None not in edgemap.values():
return
# Check for more edges to the right of our ending edges.
# We need enough space to draw adjustment lines for these.
edgechars = extra[::2]
while edgechars and edgechars[-1] is None:
edgechars.pop()
shift_size = max((edgechars.count(None) * 2) - 1, 0)
while len(lines) < 3 + shift_size:
lines.append(extra[:])
if shift_size:
empties = []
toshift = []
first_empty = extra.index(None)
for i, c in enumerate(extra[first_empty::2], first_empty // 2):
if c is None:
empties.append(i * 2)
else:
toshift.append(i * 2)
targets = list(range(first_empty, first_empty + len(toshift) * 2, 2))
positions = toshift[:]
for line in lines[-shift_size:]:
line[first_empty:] = [' '] * (len(line) - first_empty)
for i in range(len(positions)):
pos = positions[i] - 1
positions[i] = max(pos, targets[i])
line[pos] = '/' if pos > targets[i] else extra[toshift[i]]
map = {1: '|', 2: '~'}
for i, line in enumerate(lines):
if None not in line:
continue
line[:] = [c or map.get(i, ' ') for c in line]
# remove edges that ended
remove = [p for p, c in edgemap.items() if c is None]
for parent in remove:
del edgemap[parent]
seen.remove(parent)
def asciistate():
"""returns the initial value for the "state" argument to ascii()"""
return {
'seen': [],
'edges': {},
'lastcoldiff': 0,
'lastindex': 0,
'styles': EDGES.copy(),
'graphshorten': False,
}
def outputgraph(ui, graph):
"""outputs an ASCII graph of a DAG
this is a helper function for 'ascii' below.
takes the following arguments:
- ui to write to
- graph data: list of { graph nodes/edges, text }
this function can be monkey-patched by extensions to alter graph display
without needing to mimic all of the edge-fixup logic in ascii()
"""
for (ln, logstr) in graph:
ui.write((ln + logstr).rstrip() + "\n")
def ascii(ui, state, type, char, text, coldata):
"""prints an ASCII graph of the DAG
takes the following arguments (one call per node in the graph):
- ui 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, usually 'C' for changesets.
- 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
edgemap, seen = state['edges'], state['seen']
# Be tolerant of history issues; make sure we have at least ncols + coldiff
# elements to work with. See test-glog.t for broken history test cases.
echars = [c for p in seen for c in (edgemap.get(p, '|'), ' ')]
echars.extend(('|', ' ') * max(ncols + coldiff - len(seen), 0))
if coldiff == -1:
# Transform
#
# | | | | | |
# o | | into o---+
# |X / |/ /
# | | | |
_fixlongrightedges(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 = echars[:idx * 2]
nodeline.extend([char, " "])
nodeline.extend(
_getnodelineedgestail(
echars, idx, state['lastindex'], ncols, coldiff,
state['lastcoldiff'], fix_nodeline_tail))
# shift_interline is the line containing the non-vertical
# edges between this entry and the next
shift_interline = echars[:idx * 2]
for i in xrange(2 + coldiff):
shift_interline.append(' ')
count = ncols - idx - 1
if coldiff == -1:
for i in xrange(count):
shift_interline.extend(['/', ' '])
elif coldiff == 0:
shift_interline.extend(echars[(idx + 1) * 2:ncols * 2])
else:
for i in xrange(count):
shift_interline.extend(['\\', ' '])
# draw edges from the current node to its parents
_drawedges(echars, edges, nodeline, shift_interline)
# lines is the list of all graph lines to print
lines = [nodeline]
if add_padding_line:
lines.append(_getpaddingline(echars, idx, ncols, edges))
# If 'graphshorten' config, only draw shift_interline
# when there is any non vertical flow in graph.
if state['graphshorten']:
if any(c in '\/' for c in shift_interline if c):
lines.append(shift_interline)
# Else, no 'graphshorten' config so draw shift_interline.
else:
lines.append(shift_interline)
# make sure that there are as many graph lines as there are
# log strings
extra_interline = echars[:(ncols + coldiff) * 2]
if len(lines) < len(text):
while len(lines) < len(text):
lines.append(extra_interline[:])
_drawendinglines(lines, extra_interline, edgemap, seen)
while len(text) < len(lines):
text.append("")
if any(len(char) > 1 for char in edgemap.values()):
# limit drawing an edge to the first or last N lines of the current
# section the rest of the edge is drawn like a parent line.
parent = state['styles'][PARENT][-1:]
def _drawgp(char, i):
# should a grandparent character be drawn for this line?
if len(char) < 2:
return True
num = int(char[:-1])
# either skip first num lines or take last num lines, based on sign
return -num <= i if num < 0 else (len(lines) - i) <= num
for i, line in enumerate(lines):
line[:] = [c[-1:] if _drawgp(c, i) else parent for c in line]
edgemap.update(
(e, (c if len(c) < 2 else parent)) for e, c in edgemap.items())
# print lines
indentation_level = max(ncols, ncols + coldiff)
lines = ["%-*s " % (2 * indentation_level, "".join(line)) for line in lines]
outputgraph(ui, zip(lines, text))
# ... and start over
state['lastcoldiff'] = coldiff
state['lastindex'] = idx