From e9090dded3c478126731855c860bcd51f4a2910b Mon Sep 17 00:00:00 2001
From: Joseph Graham <joseph@fibreglass.tunachunks>
Date: Thu, 29 Aug 2013 22:19:31 +0100
Subject: made the code that unsets facts more robust

---
 hack_of_all_hacks | 42 ++++++++++++++++++++++++++++--------------
 1 file changed, 28 insertions(+), 14 deletions(-)

diff --git a/hack_of_all_hacks b/hack_of_all_hacks
index 5ee621b..2f940dc 100644
--- a/hack_of_all_hacks
+++ b/hack_of_all_hacks
@@ -277,26 +277,40 @@ EOF
                 thing="${thing%% isn\'t *}"
                 isnt="${sentence#* isn\'t }"
 
-                if grep "${isnt}" "info/${thing}" >/dev/null
-                then
-                    grep -v "${isnt}" "info/${thing}" | sponge "info/${thing}"
-                    send_msg "${channel_it_came_from}" "${personoslash}: OK, entry removed."
-                else
-                    send_msg "${channel_it_came_from}" "${personoslash}: I know."
-                fi
+                number_of_matching_lines=$(grep -c "^${isnt}" "info/${thing}")
+
+                case "${number_of_matching_lines}" in
+                    0 )
+                        send_msg "${channel_it_came_from}" "${personoslash}: I know."
+                        ;;
+                    1 )
+                        grep -v "${isnt}" "info/${thing}" | sponge "info/${thing}"
+                        send_msg "${channel_it_came_from}" "${personoslash}: OK, entry removed."
+                        ;;
+                    * )
+                        send_msg "${channel_it_came_from}" "${personoslash}: Ambiguos."
+                        ;;
+                esac
                 ;;
             "${my_own_name}: "+([![:space:]])" isn't: "+([![:space:]])* )
                 declare -l thing="${sentence#${my_own_name}: }"
                 thing="${thing%% isn\'t: *}"
                 isnt="${sentence#* isn\'t: }"
 
-                if grep "${isnt}" "info/${thing}" >/dev/null
-                then
-                    grep -v "${isnt}" "info/${thing}" | sponge "info/${thing}"
-                    send_msg "${channel_it_came_from}" "${personoslash}: OK, entry removed."
-                else
-                    send_msg "${channel_it_came_from}" "${personoslash}: I know."
-                fi
+                number_of_matching_lines=$(grep -c "^${isnt}" "info/${thing}")
+
+                case "${number_of_matching_lines}" in
+                    0 )
+                        send_msg "${channel_it_came_from}" "${personoslash}: I know."
+                        ;;
+                    1 )
+                        grep -v "${isnt}" "info/${thing}" | sponge "info/${thing}"
+                        send_msg "${channel_it_came_from}" "${personoslash}: OK, entry removed."
+                        ;;
+                    * )
+                        send_msg "${channel_it_came_from}" "${personoslash}: Ambiguos."
+                        ;;
+                esac
                 ;;
             ','+([![:space:]]) )
                 thing="${sentence#,}"
-- 
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