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  • Committer: Gary van der Merwe
  • Date: 2007-09-22 15:01:53 UTC
  • mfrom: (256.4.1 gtk)
  • mto: This revision was merged to the branch mainline in revision 289.
  • Revision ID: garyvdm@gmail.com-20070922150153-zkqtq9gfj9d3pwrk
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__copyright__ = "Copyright © 2005 Canonical Ltd."
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__author__    = "Scott James Remnant <scott@ubuntu.com>"
11
11
 
12
 
from bzrlib.revision import NULL_REVISION
13
12
from bzrlib.tsort import merge_sort
14
 
from bzrlib import ui
15
13
 
16
 
def linegraph(graph, start_revs, maxnum=None, broken_line_length=None,
17
 
              graph_data=True, mainline_only=False, root_progress=None):
18
 
    """Produce a directed graph of a bzr repository.
 
14
def linegraph(branch, start, maxnum):
 
15
    """Produce a directed graph of a bzr branch.
19
16
 
20
17
    Returns a tuple of (line_graph, revid_index, columns_len) where
21
18
    * line_graph is a list of tuples of (revid,
43
40
    It's up to you how to actually draw the nodes and lines (straight,
44
41
    curved, kinked, etc.) and to pick the actual colours for each index.
45
42
    """
46
 
    assert isinstance(start_revs, list)
47
 
    def update_root_progress(step_number):
48
 
        """IFF our container received a root progress bar, then update it."""
49
 
        if root_progress is not None:
50
 
            root_progress.update(current=step_number)
51
 
 
52
 
    graph_parents = {}
53
 
    ghosts = set()
 
43
    
 
44
    # FIXME: This should be configurable
 
45
    BROKEN_LINE_LENGTH = 32
 
46
    
 
47
    # We get the mainline so we can pass it to merge_sort to make merge_sort
 
48
    # run faster.
 
49
    mainline = branch.revision_history()
 
50
    graph_parents = branch.repository.get_revision_graph(start)
54
51
    graph_children = {}
55
 
    update_root_progress(1)
56
 
    progress_bar = ui.ui_factory.nested_progress_bar()
57
 
    try:
58
 
        progress_bar.update(msg="Arranging tree fragments")
59
 
        for i, (revid, parent_revids) in enumerate(graph.iter_ancestry(start_revs)):
60
 
            if i % 25 == 0:
61
 
                progress_bar.tick()
62
 
            if parent_revids is None:
63
 
                ghosts.add(revid)
64
 
                continue
65
 
            if parent_revids == (NULL_REVISION,):
66
 
                graph_parents[revid] = ()
67
 
            else:
68
 
                graph_parents[revid] = parent_revids
69
 
            for parent in parent_revids:
70
 
                graph_children.setdefault(parent, []).append(revid)
71
 
            graph_children.setdefault(revid, [])
72
 
    finally:
73
 
        progress_bar.finished()
74
 
 
75
 
    update_root_progress(2)
76
 
    progress_bar = ui.ui_factory.nested_progress_bar()
77
 
    try:
78
 
        progress_bar.update(msg="Removing ghosts", total=len(ghosts))
79
 
        for i, ghost in enumerate(ghosts):
80
 
            if i % 25 == 0:
81
 
                progress_bar.update(current=i)
82
 
            for ghost_child in graph_children[ghost]:
83
 
                graph_parents[ghost_child] = [p for p in graph_parents[ghost_child]
84
 
                                              if p not in ghosts]
85
 
    finally:
86
 
        progress_bar.finished()
87
 
    graph_parents["top:"] = start_revs
88
 
 
89
 
    if len(graph_parents)>0:
90
 
        merge_sorted_revisions = merge_sort(
91
 
            graph_parents,
92
 
            "top:",
93
 
            generate_revno=True)
94
 
    else:
95
 
        merge_sorted_revisions = ()
96
 
    
97
 
    if mainline_only:
98
 
        merge_sorted_revisions = [elem for elem in merge_sorted_revisions \
99
 
                                  if len(elem[3])==1 ]
100
 
 
101
 
    assert merge_sorted_revisions[0][1] == "top:"
102
 
    merge_sorted_revisions = merge_sorted_revisions[1:]
 
52
    for revid in graph_parents.iterkeys():
 
53
        graph_children[revid] = []
 
54
 
 
55
    merge_sorted_revisions = merge_sort(
 
56
        graph_parents,
 
57
        start,
 
58
        mainline,
 
59
        generate_revno=True)
103
60
    
104
61
    revid_index = {}
105
62
    revno_index = {}
115
72
    
116
73
    linegraph = []    
117
74
    
118
 
    update_root_progress(3)
119
 
    progress_bar = ui.ui_factory.nested_progress_bar()
120
 
    try:
121
 
        progress_bar.update(msg="Finding nodes", total=len(merge_sorted_revisions))
122
 
        for (rev_index, (sequence_number,
123
 
                         revid,
124
 
                         merge_depth,
125
 
                         revno_sequence,
126
 
                         end_of_merge)) in enumerate(merge_sorted_revisions):
 
75
    for (rev_index, (sequence_number,
 
76
                     revid,
 
77
                     merge_depth,
 
78
                     revno_sequence,
 
79
                     end_of_merge)) in enumerate(merge_sorted_revisions):
 
80
        
 
81
        revid_index[revid] = rev_index
 
82
        revno_index[revno_sequence] = rev_index
 
83
        
 
84
        branch_id = revno_sequence[0:-1]
 
85
        
 
86
        branch_line = None
 
87
        if branch_id not in branch_lines:
 
88
            branch_line = []
 
89
            branch_lines[branch_id] = branch_line
 
90
        else:
 
91
            branch_line = branch_lines[branch_id]
 
92
        
 
93
        branch_line.append(rev_index)
 
94
        
 
95
        parents = graph_parents[revid]
 
96
        for parent_revid in parents:
 
97
            graph_children[parent_revid].append(revid)
 
98
        
 
99
        linegraph.append([revid,
 
100
                          None,
 
101
                          [],
 
102
                          parents,
 
103
                          None,
 
104
                          revno_sequence])
127
105
 
128
 
            if rev_index % 25 == 0:
129
 
                progress_bar.update(current=rev_index)
130
 
            if maxnum and rev_index >= maxnum:
131
 
                break
132
 
            revid_index[revid] = rev_index
133
 
            
134
 
            parents = graph_parents[revid]
135
 
            linegraph.append([revid,
136
 
                              None,
137
 
                              [],
138
 
                              parents,
139
 
                              None,
140
 
                              revno_sequence])
141
 
            
142
 
            if graph_data:
143
 
                revno_index[revno_sequence] = rev_index
144
 
                
145
 
                branch_id = revno_sequence[0:-1]
146
 
                
147
 
                branch_line = None
148
 
                if branch_id not in branch_lines:
149
 
                    branch_line = []
150
 
                    branch_lines[branch_id] = branch_line
 
106
    branch_ids = branch_lines.keys()
 
107
    
 
108
    def branch_id_cmp(x, y):
 
109
        """Compaire branch_id's first by the number of digits, then reversed
 
110
        by their value"""
 
111
        len_x = len(x)
 
112
        len_y = len(y)
 
113
        if len_x == len_y:
 
114
            return -cmp(x, y)
 
115
        return cmp(len_x, len_y)
 
116
    
 
117
    branch_ids.sort(branch_id_cmp)
 
118
    # This will hold a tuple of (child_index, parent_index, col_index) for each
 
119
    # line that needs to be drawn. If col_index is not none, then the line is
 
120
    # drawn along that column, else the the line can be drawn directly between
 
121
    # the child and parent because either the child and parent are in the same
 
122
    # branch line, or the child and parent are 1 row apart.
 
123
    lines = []
 
124
    empty_column = [False for i in range(len(graph_parents))]
 
125
    # This will hold a bit map for each cell. If the cell is true, then the
 
126
    # cell allready contains a node or line. This use when deciding what column
 
127
    # to place a branch line or line in, without it overlaping something else.
 
128
    columns = [list(empty_column)]
 
129
    
 
130
    
 
131
    for branch_id in branch_ids:
 
132
        branch_line = branch_lines[branch_id]
 
133
        
 
134
        # Find the col_index for the direct parent branch. This will be the
 
135
        # starting point when looking for a free column.
 
136
        parent_col_index = 0
 
137
        parent_index = None
 
138
        if len(branch_id) > 1:
 
139
            parent_revno = branch_id[0:-1]
 
140
            if parent_revno in revno_index:
 
141
                parent_index = revno_index[parent_revno]
 
142
                parent_node = linegraph[parent_index][1]
 
143
                if parent_node:
 
144
                    parent_col_index = parent_node[0]
 
145
                
 
146
        
 
147
        col_search_order = _branch_line_col_search_order(columns,
 
148
                                                         parent_col_index)
 
149
        color = reduce(lambda x, y: x+y, branch_id, 0)
 
150
        cur_cont_line = []
 
151
        
 
152
        line_range = []
 
153
        last_rev_index = None
 
154
        for rev_index in branch_line:
 
155
            if last_rev_index:
 
156
                if rev_index - last_rev_index > BROKEN_LINE_LENGTH:
 
157
                    line_range.append(last_rev_index+1)
 
158
                    line_range.append(rev_index-1)
151
159
                else:
152
 
                    branch_line = branch_lines[branch_id]
153
 
                
154
 
                branch_line.append(rev_index)        
155
 
    finally:
156
 
        progress_bar.finished()
157
 
 
158
 
    if graph_data:
159
 
        branch_ids = branch_lines.keys()
160
 
    
161
 
        def branch_id_cmp(x, y):
162
 
            """Compaire branch_id's first by the number of digits, then reversed
163
 
            by their value"""
164
 
            len_x = len(x)
165
 
            len_y = len(y)
166
 
            if len_x == len_y:
167
 
                return -cmp(x, y)
168
 
            return cmp(len_x, len_y)
169
 
        
170
 
        branch_ids.sort(branch_id_cmp)
171
 
        # This will hold a tuple of (child_index, parent_index, col_index) for each
172
 
        # line that needs to be drawn. If col_index is not none, then the line is
173
 
        # drawn along that column, else the the line can be drawn directly between
174
 
        # the child and parent because either the child and parent are in the same
175
 
        # branch line, or the child and parent are 1 row apart.
176
 
        lines = []
177
 
        empty_column = [False for i in range(len(graph_parents))]
178
 
        # This will hold a bit map for each cell. If the cell is true, then the
179
 
        # cell allready contains a node or line. This use when deciding what column
180
 
        # to place a branch line or line in, without it overlaping something else.
181
 
        columns = [list(empty_column)]
182
 
        
183
 
        
184
 
        update_root_progress(4)
185
 
        progress_bar = ui.ui_factory.nested_progress_bar()
186
 
        try:
187
 
            progress_bar.update(msg="Organizing edges", total=len(branch_ids))
188
 
            for i, branch_id in enumerate(branch_ids):
189
 
                if i % 25 == 0:
190
 
                    progress_bar.update(current=i)
191
 
                branch_line = branch_lines[branch_id]
192
 
                
193
 
                # Find the col_index for the direct parent branch. This will be the
194
 
                # starting point when looking for a free column.
195
 
                parent_col_index = 0
196
 
                parent_index = None
197
 
                if len(branch_id) > 1:
198
 
                    parent_revno = branch_id[0:-1]
199
 
                    if parent_revno in revno_index:
200
 
                        parent_index = revno_index[parent_revno]
201
 
                        parent_node = linegraph[parent_index][1]
202
 
                        if parent_node:
203
 
                            parent_col_index = parent_node[0]
 
160
                    line_range.extend(range(last_rev_index+1, rev_index))
 
161
            
 
162
            line_range.append(rev_index)
 
163
            last_rev_index = rev_index
 
164
        
 
165
        if parent_index:
 
166
            if parent_index - last_rev_index > BROKEN_LINE_LENGTH:
 
167
                line_range.append(last_rev_index+1)
 
168
            else:
 
169
                line_range.extend(range(last_rev_index+1, parent_index))
 
170
        
 
171
        col_index = _find_free_column(columns,
 
172
                                      empty_column,
 
173
                                      col_search_order,
 
174
                                      line_range)
 
175
        node = (col_index, color)
 
176
        for rev_index in branch_line:
 
177
            linegraph[rev_index][1] = node
 
178
            columns[col_index][rev_index] = True
 
179
        
 
180
        for rev_index in branch_line:
 
181
            (sequence_number,
 
182
                 revid,
 
183
                 merge_depth,
 
184
                 revno_sequence,
 
185
                 end_of_merge) = merge_sorted_revisions[rev_index]
 
186
            
 
187
            linegraph[rev_index][4] = graph_children[revid]
 
188
            col_index = linegraph[rev_index][1][0]
 
189
            
 
190
            for parent_revid in graph_parents[revid]:
 
191
                if parent_revid in revid_index:
 
192
                    
 
193
                    parent_index = revid_index[parent_revid]                            
 
194
                    parent_node = linegraph[parent_index][1]
 
195
                    if parent_node:
 
196
                        parent_col_index = parent_node[0]
 
197
                    else:
 
198
                        parent_col_index = None
 
199
                    col_search_order = \
 
200
                            _line_col_search_order(columns,
 
201
                                                   parent_col_index,
 
202
                                                   col_index)
204
203
                        
205
 
                
206
 
                col_search_order = _branch_line_col_search_order(columns,
207
 
                                                                 parent_col_index)
208
 
                color = reduce(lambda x, y: x+y, branch_id, 0)
209
 
                cur_cont_line = []
210
 
                
211
 
                line_range = []
212
 
                last_rev_index = None
213
 
                for rev_index in branch_line:
214
 
                    if last_rev_index:
215
 
                        if broken_line_length and \
216
 
                           rev_index - last_rev_index > broken_line_length:
217
 
                            line_range.append(last_rev_index+1)
218
 
                            line_range.append(rev_index-1)
219
 
                        else:
220
 
                            line_range.extend(range(last_rev_index+1, rev_index))
221
 
                    
222
 
                    line_range.append(rev_index)
223
 
                    last_rev_index = rev_index
224
 
                
225
 
                if parent_index:
226
 
                    if broken_line_length and \
227
 
                       parent_index - last_rev_index > broken_line_length:
228
 
                        line_range.append(last_rev_index+1)
229
 
                    else:
230
 
                        line_range.extend(range(last_rev_index+1, parent_index))
231
 
                
232
 
                col_index = _find_free_column(columns,
233
 
                                              empty_column,
234
 
                                              col_search_order,
235
 
                                              line_range)
236
 
                node = (col_index, color)
237
 
                for rev_index in branch_line:
238
 
                    linegraph[rev_index][1] = node
239
 
                    columns[col_index][rev_index] = True
240
 
                
241
 
                for rev_index in branch_line:
242
 
                    (sequence_number,
243
 
                         revid,
244
 
                         merge_depth,
245
 
                         revno_sequence,
246
 
                         end_of_merge) = merge_sorted_revisions[rev_index]
247
 
                    
248
 
                    linegraph[rev_index][4] = graph_children[revid]
249
 
                    col_index = linegraph[rev_index][1][0]
250
 
                    
251
 
                    for parent_revid in graph_parents[revid]:
252
 
                        if parent_revid in revid_index:
253
 
                            
254
 
                            parent_index = revid_index[parent_revid]                            
255
 
                            parent_node = linegraph[parent_index][1]
256
 
                            if parent_node:
257
 
                                parent_col_index = parent_node[0]
258
 
                            else:
259
 
                                parent_col_index = None
260
 
                            col_search_order = \
261
 
                                    _line_col_search_order(columns,
262
 
                                                           parent_col_index,
263
 
                                                           col_index)
264
 
                                
265
 
                            # If this line is really long, break it.
266
 
                            if len(branch_id) > 0 and \
267
 
                               broken_line_length and \
268
 
                               parent_index - rev_index > broken_line_length:
269
 
                                child_line_col_index = \
270
 
                                    _find_free_column(columns,
271
 
                                                      empty_column,
272
 
                                                      col_search_order,
273
 
                                                      (rev_index + 1,))
274
 
                                _mark_column_as_used(columns,
275
 
                                                     child_line_col_index,
276
 
                                                     (rev_index + 1,))
277
 
                                
278
 
                                # Recall _line_col_search_order to reset it back to
279
 
                                # the beging.
280
 
                                col_search_order = \
281
 
                                        _line_col_search_order(columns,
282
 
                                                               parent_col_index,
283
 
                                                               col_index)
284
 
                                parent_col_line_index = \
285
 
                                    _find_free_column(columns,
286
 
                                                      empty_column,
287
 
                                                      col_search_order,
288
 
                                                      (parent_index - 1,))
289
 
                                _mark_column_as_used(columns,
290
 
                                                     parent_col_line_index,
291
 
                                                     (parent_index - 1,))
292
 
                                lines.append((rev_index,
293
 
                                              parent_index,
294
 
                                              (child_line_col_index,
295
 
                                               parent_col_line_index)))
296
 
                            else :
297
 
                                line_col_index = col_index
298
 
                                if parent_index - rev_index >1:
299
 
                                    line_range = range(rev_index + 1, parent_index)
300
 
                                    line_col_index = \
301
 
                                        _find_free_column(columns,
302
 
                                                          empty_column,
303
 
                                                          col_search_order,
304
 
                                                          line_range)
305
 
                                    _mark_column_as_used(columns,
306
 
                                                         line_col_index,
307
 
                                                         line_range)
308
 
                                lines.append((rev_index,
309
 
                                              parent_index,
310
 
                                              (line_col_index,)))
311
 
        finally:
312
 
            progress_bar.finished()
 
204
                    # If this line is really long, break it.
 
205
                    if len(branch_id) > 0 and \
 
206
                       parent_index - rev_index > BROKEN_LINE_LENGTH:
 
207
                        child_line_col_index = \
 
208
                            _find_free_column(columns,
 
209
                                              empty_column,
 
210
                                              col_search_order,
 
211
                                              (rev_index + 1,))
 
212
                        _mark_column_as_used(columns,
 
213
                                             child_line_col_index,
 
214
                                             (rev_index + 1,))
 
215
                        parent_col_line_index = \
 
216
                            _find_free_column(columns,
 
217
                                              empty_column,
 
218
                                              col_search_order,
 
219
                                              (parent_index - 1,))
 
220
                        _mark_column_as_used(columns,
 
221
                                             parent_col_line_index,
 
222
                                             (parent_index - 1,))
 
223
                        lines.append((rev_index,
 
224
                                      parent_index,
 
225
                                      (child_line_col_index,
 
226
                                       parent_col_line_index)))
 
227
                    else :
 
228
                        line_col_index = col_index
 
229
                        if parent_index - rev_index >1:
 
230
                            line_range = range(rev_index + 1, parent_index)
 
231
                            line_col_index = \
 
232
                                _find_free_column(columns,
 
233
                                                  empty_column,
 
234
                                                  col_search_order,
 
235
                                                  line_range)
 
236
                            _mark_column_as_used(columns,
 
237
                                                 line_col_index,
 
238
                                                 line_range)
 
239
                        lines.append((rev_index,
 
240
                                      parent_index,
 
241
                                      (line_col_index,)))
 
242
    
 
243
    for (child_index, parent_index, line_col_indexes) in lines:
 
244
        (child_col_index, child_color) = linegraph[child_index][1]
 
245
        (parent_col_index, parent_color) = linegraph[parent_index][1]
313
246
        
314
 
        update_root_progress(5)
315
 
        progress_bar = ui.ui_factory.nested_progress_bar()
316
 
        try:
317
 
            progress_bar.update(msg="Pretifying graph", total=len(lines))
318
 
            for i, (child_index, parent_index, line_col_indexes) in enumerate(lines):
319
 
                if i % 25 == 0:
320
 
                    progress_bar.update(current=i)
321
 
                (child_col_index, child_color) = linegraph[child_index][1]
322
 
                (parent_col_index, parent_color) = linegraph[parent_index][1]
323
 
                
324
 
                if len(line_col_indexes) == 1:
325
 
                    if parent_index - child_index == 1:
326
 
                        linegraph[child_index][2].append(
327
 
                            (child_col_index,
328
 
                             parent_col_index,
329
 
                             parent_color))
330
 
                    else:
331
 
                        # line from the child's column to the lines column
332
 
                        linegraph[child_index][2].append(
333
 
                            (child_col_index,
334
 
                             line_col_indexes[0],
335
 
                             parent_color))
336
 
                        # lines down the line's column
337
 
                        for line_part_index in range(child_index+1, parent_index-1):
338
 
                            linegraph[line_part_index][2].append(
339
 
                                (line_col_indexes[0],   
340
 
                                 line_col_indexes[0],
341
 
                                 parent_color))
342
 
                        # line from the line's column to the parent's column
343
 
                        linegraph[parent_index-1][2].append(
344
 
                            (line_col_indexes[0],
345
 
                             parent_col_index,
346
 
                             parent_color))
347
 
                else:
348
 
                    # Broken line
349
 
                    # line from the child's column to the lines column
350
 
                    linegraph[child_index][2].append(
351
 
                        (child_col_index,
 
247
        if len(line_col_indexes) == 1:
 
248
            if parent_index - child_index == 1:
 
249
                linegraph[child_index][2].append(
 
250
                    (child_col_index,
 
251
                     parent_col_index,
 
252
                     parent_color))
 
253
            else:
 
254
                # line from the child's column to the lines column
 
255
                linegraph[child_index][2].append(
 
256
                    (child_col_index,
 
257
                     line_col_indexes[0],
 
258
                     parent_color))
 
259
                # lines down the line's column
 
260
                for line_part_index in range(child_index+1, parent_index-1):
 
261
                    linegraph[line_part_index][2].append(
 
262
                        (line_col_indexes[0],   
352
263
                         line_col_indexes[0],
353
264
                         parent_color))
354
 
                    # Broken line end
355
 
                    linegraph[child_index+1][2].append(
356
 
                        (line_col_indexes[0],
357
 
                         None,
358
 
                         parent_color))
359
 
                    
360
 
                    # Broken line end 
361
 
                    linegraph[parent_index-2][2].append(
362
 
                        (None,
363
 
                         line_col_indexes[1],
364
 
                         parent_color))
365
 
                    # line from the line's column to the parent's column
366
 
                    linegraph[parent_index-1][2].append(
367
 
                        (line_col_indexes[1],
368
 
                         parent_col_index,
369
 
                         parent_color))
370
 
        finally:
371
 
            progress_bar.finished()
372
 
        return (linegraph, revid_index, len(columns))
373
 
    else:
374
 
        return (linegraph, revid_index, 0)
 
265
                # line from the line's column to the parent's column
 
266
                linegraph[parent_index-1][2].append(
 
267
                    (line_col_indexes[0],
 
268
                     parent_col_index,
 
269
                     parent_color))
 
270
        else:
 
271
            # Broken line
 
272
            # line from the child's column to the lines column
 
273
            linegraph[child_index][2].append(
 
274
                (child_col_index,
 
275
                 line_col_indexes[0],
 
276
                 parent_color))
 
277
            # Broken line end
 
278
            linegraph[child_index+1][2].append(
 
279
                (line_col_indexes[0],
 
280
                 None,
 
281
                 parent_color))
 
282
            
 
283
            # Broken line end 
 
284
            linegraph[parent_index-2][2].append(
 
285
                (None,
 
286
                 line_col_indexes[1],
 
287
                 parent_color))
 
288
            # line from the line's column to the parent's column
 
289
            linegraph[parent_index-1][2].append(
 
290
                (line_col_indexes[1],
 
291
                 parent_col_index,
 
292
                 parent_color))
 
293
            
375
294
    
 
295
    return (linegraph, revid_index, len(columns))
376
296
 
377
297
def _branch_line_col_search_order(columns, parent_col_index):
378
 
    for col_index in range(parent_col_index, len(columns)):
379
 
        yield col_index
380
 
    for col_index in range(parent_col_index-1, -1, -1):
381
 
        yield col_index
 
298
    return range(parent_col_index, len(columns)) + \
 
299
           range(parent_col_index-1, -1, -1)
382
300
 
383
301
def _line_col_search_order(columns, parent_col_index, child_col_index):
 
302
    dest_col_indexes = []
384
303
    if parent_col_index is not None:
385
 
        max_index = max(parent_col_index, child_col_index)
386
 
        min_index = min(parent_col_index, child_col_index)
387
 
        for col_index in range(max_index, min_index -1, -1):
388
 
            yield col_index
 
304
        dest_col_indexes.append(parent_col_index)
389
305
    else:
390
 
        max_index = child_col_index
391
 
        min_index = child_col_index
392
 
        yield child_col_index
 
306
        dest_col_indexes.append(child_col_index)
 
307
    dest_col_indexes.append(child_col_index)
 
308
    dest_col_indexes.sort()
 
309
    col_search_order = range(dest_col_indexes[1], dest_col_indexes[0] -1, -1) 
393
310
    i = 1
394
 
    while max_index + i < len(columns) or \
395
 
          min_index - i > -1:
396
 
        if max_index + i < len(columns):
397
 
            yield max_index + i
398
 
        if min_index - i > -1:
399
 
            yield min_index - i
 
311
    while dest_col_indexes[1] + i < len(columns) or \
 
312
          dest_col_indexes[0] - i > -1:
 
313
        if dest_col_indexes[1] + i < len(columns):
 
314
            col_search_order.append(dest_col_indexes[1] + i)
 
315
        if dest_col_indexes[0] - i > -1:
 
316
            col_search_order.append(dest_col_indexes[0] - i)
400
317
        i += 1
 
318
    return col_search_order
401
319
 
402
320
def _find_free_column(columns, empty_column, col_search_order, line_range):
403
321
    for col_index in col_search_order: