crecord: move status window text calculation to a separate method

We will do some changes there in the next patches. The new method would also
be the "source of truth" of the content of the status window (so if the
status window needs more than 2 lines, it would be calculated from the new
method).

Also, moved "statuswin.refresh" to make the code compact and easier to read.

mercurial/crecord.py

@@ -946,6 +946,17 b' class curseschunkselector(object):'
         self.linesprintedtopadsofar += linesprinted
         return t
 
+    def _getstatuslines(self):
+        """() -> [str]. return short help used in the top status window"""
+        if self.errorstr is not None:
+            lines = [self.errorstr, _('Press any key to continue')]
+        else:
+            lines = [_("SELECT CHUNKS: (j/k/up/dn/pgup/pgdn) move cursor; "
+                       "(space/A) toggle hunk/all; (e)dit hunk;"),
+                     _(" (f)old/unfold; (c)onfirm applied; (q)uit; (?) help "
+                       "| [X]=hunk applied **=folded, toggle [a]mend mode")]
+        return [util.ellipsis(l, self.xscreensize - 1) for l in lines]
+
     def updatescreen(self):
         self.statuswin.erase()
         self.chunkpad.erase()
@@ -954,25 +965,13 b' class curseschunkselector(object):'
 
         # print out the status lines at the top
         try:
-            if self.errorstr is not None:
-                printstring(self.statuswin, self.errorstr, pairname='legend')
-                printstring(self.statuswin, 'Press any key to continue',
-                            pairname='legend')
+            for line in self._getstatuslines():
+                printstring(self.statuswin, line, pairname="legend")
                 self.statuswin.refresh()
-                return
-            line1 = _("SELECT CHUNKS: (j/k/up/dn/pgup/pgdn) move cursor; "
-                      "(space/A) toggle hunk/all; (e)dit hunk;")
-            line2 = _(" (f)old/unfold; (c)onfirm applied; (q)uit; (?) help "
-                      "| [X]=hunk applied **=folded, toggle [a]mend mode")
-
-            printstring(self.statuswin,
-                        util.ellipsis(line1, self.xscreensize - 1),
-                        pairname="legend")
-            printstring(self.statuswin,
-                        util.ellipsis(line2, self.xscreensize - 1),
-                        pairname="legend")
         except curses.error:
             pass
+        if self.errorstr is not None:
+            return
 
         # print out the patch in the remaining part of the window
         try:
@@ -985,9 +984,6 b' class curseschunkselector(object):'
         except curses.error:
             pass
 
-        # refresh([pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol])
-        self.statuswin.refresh()
-
     def getstatusprefixstring(self, item):
         """
         create a string to prefix a line with which indicates whether 'item'