strip punctuations around word before searching

This should fix #1337.

frontend/apps/reader/modules/readerdictionary.lua

@@ -59,9 +59,7 @@ end
 function ReaderDictionary:stardictLookup(word, box)
     DEBUG("lookup word:", word, box)
     if word then
-        -- strip ASCII punctuation characters around selected word
-        -- and strip any generic punctuation (U+2000 - U+206F) in the word
-        word = word:gsub("\226[\128-\131][\128-\191]",''):gsub("^%p+",''):gsub("%p+$",'')
+        word = require("util").stripePunctuations(word)
         DEBUG("stripped word:", word)
         -- escape quotes and other funny characters in word
         local std_out = io.popen("./sdcv --utf8-input --utf8-output -nj "..("%q"):format(word), "r")

frontend/apps/reader/modules/readersearch.lua

@@ -29,6 +29,7 @@ function ReaderSearch:addToMainMenu(tab_item_table)
 end
 
 function ReaderSearch:onShowSearchDialog(text)
+    text = require("util").stripePunctuations(text)
     local do_search = function(search_func, text, param)
         return function()
             local res = search_func(self, text, param)

frontend/util.lua

@@ -0,0 +1,11 @@
+
+local util = {}
+
+function util.stripePunctuations(word)
+    if not word then return end
+    -- strip ASCII punctuation characters around word
+    -- and strip any generic punctuation (U+2000 - U+206F) in the word
+    return word:gsub("\226[\128-\131][\128-\191]",''):gsub("^%p+",''):gsub("%p+$",'')
+end
+
+return util