Make box and bigbox snippet aware of &comments setting

UltiSnips/all.snippets

@@ -5,39 +5,64 @@
 # NICE BOXES #
 ##############
 global !p
-def cs(snip):
-    c = '#'
-    cs = snip.opt("&commentstring")
-    if len(cs) == 3:
-        c = cs[0]
-    return c
+import string, vim
+def _parse_comments(s):
+    i = iter(s.split(","))
+
+    rv = []
+    try:
+        while True:
+            n = i.next()
+            if n[0] == 's':
+                ctriple = []
+                indent = ""
+                if n[1] in string.digits:
+                    indent = " " * int(n[1])
+                ctriple.append(n.split(":",1)[1])
+                n = i.next()
+                assert(n[0] == 'm')
+                ctriple.append(n.split(":",1)[1])
+                n = i.next()
+                assert(n[0] == 'e')
+                ctriple.append(n.split(":",1)[1])
+                ctriple.append(indent)
+                rv.append(ctriple)
+            elif n[0] == 'b':
+                cm = n.split(":", 1)[1]
+                if len(cm) == 1:
+                    rv.insert(0, (cm,cm,cm, ""))
+    except StopIteration:
+       return rv
+
+def make_box(twidth, bwidth = None):
+   if bwidth is None:
+      bwidth = twidth + 2
+   b,m,e,i = _parse_comments(vim.eval("&comments"))[0]
+   sline = b + m + bwidth*m + 2*m
+   nspaces = (bwidth - twidth)//2 
+   mlines = i + m + " " + " "*nspaces
+   mlinee = " " + " "*(bwidth-twidth-nspaces) + m
+   eline = i + 2*m + bwidth*m + m + e
+   return sline, mlines, mlinee, eline
 endglobal
 
 snippet box "A nice box with the current comment symbol" b
 `!p
-c = cs(snip)
-
-snip.rv = (len(t[1])+4)*c
-bar = snip.rv
-snip += c + ' '`${1:content}`!p
-
-snip.rv = ' ' + c
-snip += bar`
+box = make_box(len(t[1]))
+snip.rv = box[0] + '\n' + box[1]
+`${1:content}`!p
+box = make_box(len(t[1]))
+snip.rv = box[2] + '\n' + box[3]`
 $0
 endsnippet
 
 snippet bbox "A nice box over the full width" b
 `!p
-c = cs(snip)
-bar = 75*c 
-
-snip.rv = bar
-snip += c + " " + (71-len(t[1]))/2*' '
+box = make_box(len(t[1]), 71)
+snip.rv = box[0] + '\n' + box[1]
 `${1:content}`!p
-
-a = 71-len(t[1])
-snip.rv = (a/2 + a%2) * " " + " " + c 
-snip += bar`
+box = make_box(len(t[1]), 71)
+snip.rv = box[2] + '\n' + box[3]`
 $0
 endsnippet