blame: Allow `~blame #last 2' etc.

Ie,
  ~blame #last 1   =  ~blame #last
  ~blame #last 2   =  the last-but-one fish
  ~blame #last 3   =  the last-but-two fish
etc.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
v2: Fixed off-by-one error in commit message.

diff --git a/commands.py b/commands.py
index d6ba5302dee49573d96ae9013fae6526a4c206a8..721089d3912d6e86d466c2be1d65edbf3253f7e9 100755 (executable)
--- a/commands.py
+++ b/commands.py
@@ -333,7 +333,14 @@ def blameq(bot,cmd,nick,conn,public,fishpond,cfgs):
     cwhat=' '.join(clist[2:])
     kindsfile = "fish?"
     if clist[1]=="#last":
-        try: lmsg, lcfg = fishpond.last[0]
+        try:
+            n = abs(int(clist[2]))-1
+            if n < 0: raise ValueError
+        except IndexError: n = 0
+        except ValueError:
+            bot.automsg(public,nick,"Huh?")
+            return
+        try: lmsg, lcfg = fishpond.last[n]
         except IndexError:
            bot.automsg(public,nick,"Nothing")
            return