view hgext/graphlog.py @ 7012:78341ea65d16

restructure helptable

When looking up a help topic, the key is now only matched against the
short names for each topic, and not the header. So

  hg help 'Environment Variables'

must be replaced with

  hg help env

# ASCII graph log extension for Mercurial
#
# Copyright 2007 Joel Rosdahl <[e-mail]>
#
# This software may be used and distributed according to the terms of
# the GNU General Public License, incorporated herein by reference.
'''show revision graphs in terminal windows'''

import os
import sys
from mercurial.cmdutil import revrange, show_changeset
from mercurial.commands import templateopts
from mercurial.i18n import _
from mercurial.node import nullrev
from mercurial.util import Abort, canonpath
from mercurial import util

def revision_grapher(repo, start_rev, stop_rev):
    """incremental revision grapher

    This generator function walks through the revision history from
    revision start_rev to revision stop_rev (which must be less than
    or equal to start_rev) and for each revision emits tuples with the
    following elements:

      - Current revision.
      - Current node.
      - Column of the current node in the set of ongoing edges.
      - 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.
    """

    assert start_rev >= stop_rev
    curr_rev = start_rev
    revs = []
    while curr_rev >= stop_rev:
        node = repo.changelog.node(curr_rev)

        # Compute revs and next_revs.
        if curr_rev not in revs:
            # New head.
            revs.append(curr_rev)
        rev_index = revs.index(curr_rev)
        next_revs = revs[:]

        # Add parents to next_revs.
        parents = get_rev_parents(repo, curr_rev)
        parents_to_add = []
        for parent in parents:
            if parent not in next_revs:
                parents_to_add.append(parent)
        next_revs[rev_index:rev_index + 1] = util.sort(parents_to_add)

        edges = []
        for parent in parents:
            edges.append((rev_index, next_revs.index(parent)))

        n_columns_diff = len(next_revs) - len(revs)
        yield (curr_rev, node, rev_index, edges, len(revs), n_columns_diff)

        revs = next_revs
        curr_rev -= 1

def filelog_grapher(repo, path, start_rev, stop_rev):
    """incremental file log grapher

    This generator function walks through the revision history of a
    single file from revision start_rev to revision stop_rev (which must
    be less than or equal to start_rev) and for each revision emits
    tuples with the following elements:

      - Current revision.
      - Current node.
      - Column of the current node in the set of ongoing edges.
      - 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.
    """

    assert start_rev >= stop_rev
    curr_rev = start_rev
    revs = []
    filerev = len(repo.file(path)) - 1
    while filerev >= 0:
        fctx = repo.filectx(path, fileid=filerev)

        # Compute revs and next_revs.
        if filerev not in revs:
            revs.append(filerev)
        rev_index = revs.index(filerev)
        next_revs = revs[:]

        # Add parents to next_revs.
        parents = [f.filerev() for f in fctx.parents() if f.path() == path]
        parents_to_add = []
        for parent in parents:
            if parent not in next_revs:
                parents_to_add.append(parent)
        next_revs[rev_index:rev_index + 1] = util.sort(parents_to_add)

        edges = []
        for parent in parents:
            edges.append((rev_index, next_revs.index(parent)))

        changerev = fctx.linkrev()
        if changerev <= start_rev:
            node = repo.changelog.node(changerev)
            n_columns_diff = len(next_revs) - len(revs)
            yield (changerev, node, rev_index, edges, len(revs), n_columns_diff)
        if changerev <= stop_rev:
            break
        revs = next_revs
        filerev -= 1

def get_rev_parents(repo, rev):
    return [x for x in repo.changelog.parentrevs(rev) if x != nullrev]

def fix_long_right_edges(edges):
    for (i, (start, end)) in enumerate(edges):
        if end > start:
            edges[i] = (start, end + 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 format_line(line, level, logstr):
    text = "%-*s %s" % (2 * level, "".join(line), logstr)
    return "%s\n" % text.rstrip()

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 get_padding_line(ni, n_columns, edges):
    line = []
    line.extend(["|", " "] * ni)
    if (ni, ni - 1) in edges or (ni, ni) in edges:
        # (ni, ni - 1)      (ni, ni)
        # | | | |           | | | |
        # +---o |           | o---+
        # | | c |           | c | |
        # | |/ /            | |/ /
        # | | |             | | |
        c = "|"
    else:
        c = " "
    line.extend([c, " "])
    line.extend(["|", " "] * (n_columns - ni - 1))
    return line

def get_limit(limit_opt):
    if limit_opt:
        try:
            limit = int(limit_opt)
        except ValueError:
            raise Abort(_("limit must be a positive integer"))
        if limit <= 0:
            raise Abort(_("limit must be positive"))
    else:
        limit = sys.maxint
    return limit

def get_revs(repo, rev_opt):
    if rev_opt:
        revs = revrange(repo, rev_opt)
        return (max(revs), min(revs))
    else:
        return (len(repo) - 1, 0)

def graphlog(ui, repo, path=None, **opts):
    """show revision history alongside an ASCII revision graph

    Print a revision history alongside a revision graph drawn with
    ASCII characters.

    Nodes printed as an @ character are parents of the working
    directory.
    """

    limit = get_limit(opts["limit"])
    (start_rev, stop_rev) = get_revs(repo, opts["rev"])
    stop_rev = max(stop_rev, start_rev - limit + 1)
    if start_rev == nullrev:
        return
    cs_printer = show_changeset(ui, repo, opts)
    if path:
        path = canonpath(repo.root, os.getcwd(), path)
    if path:
        grapher = filelog_grapher(repo, path, start_rev, stop_rev)
    else:
        grapher = revision_grapher(repo, start_rev, stop_rev)
    repo_parents = repo.dirstate.parents()
    prev_n_columns_diff = 0
    prev_node_index = 0

    for (rev, node, node_index, edges, n_columns, n_columns_diff) in grapher:
        # log_strings is the list of all log strings to draw alongside
        # the graph.
        ui.pushbuffer()
        cs_printer.show(rev, node)
        log_strings = ui.popbuffer().split("\n")[:-1]

        if n_columns_diff == -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(log_strings) > 2 and
                            n_columns_diff == -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(log_strings) <= 2 and not add_padding_line

        # nodeline is the line containing the node character (@ or o).
        nodeline = ["|", " "] * node_index
        if node in repo_parents:
            node_ch = "@"
        else:
            node_ch = "o"
        nodeline.extend([node_ch, " "])

        nodeline.extend(
            get_nodeline_edges_tail(
                node_index, prev_node_index, n_columns, n_columns_diff,
                prev_n_columns_diff, fix_nodeline_tail))

        # shift_interline is the line containing the non-vertical
        # edges between this entry and the next.
        shift_interline = ["|", " "] * node_index
        if n_columns_diff == -1:
            n_spaces = 1
            edge_ch = "/"
        elif n_columns_diff == 0:
            n_spaces = 2
            edge_ch = "|"
        else:
            n_spaces = 3
            edge_ch = "\\"
        shift_interline.extend(n_spaces * [" "])
        shift_interline.extend([edge_ch, " "] * (n_columns - node_index - 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(node_index, n_columns, edges))
        lines.append(shift_interline)

        # Make sure that there are as many graph lines as there are
        # log strings.
        while len(log_strings) < len(lines):
            log_strings.append("")
        if len(lines) < len(log_strings):
            extra_interline = ["|", " "] * (n_columns + n_columns_diff)
            while len(lines) < len(log_strings):
                lines.append(extra_interline)

        # Print lines.
        indentation_level = max(n_columns, n_columns + n_columns_diff)
        for (line, logstr) in zip(lines, log_strings):
            ui.write(format_line(line, indentation_level, logstr))

        # ...and start over.
        prev_node_index = node_index
        prev_n_columns_diff = n_columns_diff

cmdtable = {
    "glog":
        (graphlog,
         [('l', 'limit', '', _('limit number of changes displayed')),
          ('p', 'patch', False, _('show patch')),
          ('r', 'rev', [], _('show the specified revision or range')),
         ] + templateopts,
         _('hg glog [OPTION]... [FILE]')),
}