graphmod: partial edge styling Allow for a style to only apply to the last N lines (for positive N) or everything but the first N lines (for negative N) of the section along the current node. This allows for more subtle grandparent styling. So from the default: $ hg log -G ... o Lorem ipsum dolor sit :\ amet, consectetur : : adipiscing elit, sed : : do eiusmod tempor : : o : incididunt ut labore | : et dolore magna | : aliqua. Ut enim ad | : minim veniam, quis |/ o nostrud exercitation : ullamco laboris nisi : ut aliquip ex ea : commodo consequat. : o Duis aute irure dolor | in reprehenderit in ~ voluptate velit esse cillum dolore eu to $ hg log -G --config "experimental.graphstyle.grandparent=2." ... o Lorem ipsum dolor sit |\ amet, consectetur | | adipiscing elit, sed . . do eiusmod tempor . . o | incididunt ut labore | | et dolore magna | | aliqua. Ut enim ad | | minim veniam, quis |/ o nostrud exercitation | ullamco laboris nisi | ut aliquip ex ea . commodo consequat. . o Duis aute irure dolor | in reprehenderit in ~ voluptate velit esse cillum dolore eu or $ hg log -G --config "experimental.graphstyle.grandparent=1:" ... o Lorem ipsum dolor sit |\ amet, consectetur | | adipiscing elit, sed | | do eiusmod tempor : : o | incididunt ut labore | | et dolore magna | | aliqua. Ut enim ad | | minim veniam, quis |/ o nostrud exercitation | ullamco laboris nisi | ut aliquip ex ea | commodo consequat. : o Duis aute irure dolor | in reprehenderit in ~ voluptate velit esse cillum dolore eu or $ hg log -G --config "experimental.graphstyle.grandparent=-2!" ... o Lorem ipsum dolor sit |\ amet, consectetur ! ! adipiscing elit, sed ! ! do eiusmod tempor ! ! o | incididunt ut labore | | et dolore magna | | aliqua. Ut enim ad | | minim veniam, quis |/ o nostrud exercitation | ullamco laboris nisi ! ut aliquip ex ea ! commodo consequat. ! o Duis aute irure dolor | in reprehenderit in ~ voluptate velit esse cillum dolore eu

--- a/mercurial/graphmod.py	Sun Apr 24 14:21:38 2016 +0300
+++ b/mercurial/graphmod.py	Wed May 04 20:11:59 2016 +0100
@@ -32,7 +32,9 @@
 GRANDPARENT = 'G'
 MISSINGPARENT = 'M'
 # Style of line to draw. None signals a line that ends and is removed at this
-# point.
+# 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 groupbranchiter(revs, parentsfunc, firstbranch=()):
@@ -653,6 +655,22 @@
     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 = dict(
+            (e, c if len(c) < 2 else parent) for e, c in edgemap.items())
+
     # print lines
     indentation_level = max(ncols, ncols + coldiff)
     for (line, logstr) in zip(lines, text):