How to make a custom search engine in AppleScript So I have a database of folders and files (.txt) and I'm trying to create a program that I can enter keywords and have it search those files, and it will output the text of any files containing the keywords. I have a working code that does just that, but it doesn't search the words individually - it searches for the words together, as a single string. 

For instance, if I input "Joe Bill Bob," I'd like it to output files that contain each of those words anywhere in the file, even if they aren't next to each other, or in that order. 

I would rather avoid doing a repeat loop to input one search term at a time. 

I'd also rather avoid setting up hundreds of variables in the code, and do a repeat loop that if a character isn't a space it adds it onto the first blank variable and if it is it skips to the next variable.

If you have any other ideas, that would be great. Thanks!
Note: the text files must be encoded with the "UTF8" encoding.

Here's a starting script:

Example: The keywords: 


"Bill
Bob
Joe"



fgrep and sort return lines, like this : 


/path/of/thisFile.txt:Bill
/path/of/thisFile.txt:Bob
/path/of/thisFile.txt:Joe
/path/of/thisFile2.txt:Bob
/path/of/thisFile2.txt:Joe
/path/of/thisFile3.txt:Bob
/path/subf1/of/some_File.txt:Bill
/path/subf3/of/some_xzzz_File.txt:Bill



The script use a loop to check the path of each item in this list.

The script get the path from the first item, it remove ":Bill" at end of the line --> so the path is "/path/of/thisFile.txt".

The script check the item (current index  + the number of keywords -1), it's the third item, so the third item contains the same path, then the script append the path into a new list

The others items doesn't contains all the keywords.



set r to text returned of (display dialog "What keywords?" default answer "Joe Bill Bob") --- each keyword must be sepearated by a space
set tKeys to my makeKeysForGrep(r)
if tKeys is not "" then
    set masterFolder to choose folder with prompt "Select the source folder .."
    set filesList to my getFilescontainingKeywords(masterFolder, tKeys) -- get a list of files ( each file contains all the keywords)
    --do something with the filesList -- this list contains path of type 'posix path' 
end if

on makeKeysForGrep(t)
    (***   delete trailing and leading spaces, replace multiple spaces in a row by one space (clean the string to avoid issue with the unnecessary spaces in the grep command),
     and replace the space character by a linefeed character , so each line contains a keyword.  ***)
    set r to do shell script "perl -pe 's/ +$|^ +//g; s/ +/ /g; s/ /\\n/g; '  &lt;&lt;&lt; " &amp; (quoted form of t) &amp; "| sort -u" without altering line endings
    if r is not linefeed then return text 1 thru -2 of r -- remove the last line (it's a blank line)
    return "" -- r is a a blank line, so return ""
end makeKeysForGrep

on getFilescontainingKeywords(dir, tKeys)
    script o
        property tfiles : {}
    end script
    set numOfKeywords to count (paragraphs of tKeys) -- get the number of keywords
    set tFolder to quoted form of POSIX path of dir
    set o's tfiles to do shell script "fgrep -R -o -w  --include \"*.txt\" " &amp; (quoted form of tKeys) &amp; " " &amp; tFolder &amp; " | sort -u"
    -- fgrep return the full path + ":" + the keyword, sort -u  : sort the paths and deletes duplicate lines (because the same file can contains multiple occcurences of a keyword)

    if o's tfiles is not "" then
        if numOfKeywords = 1 then return o's tfiles -- no need to continue because one keyword only,  return all Files
        set l to {}
        set o's tfiles to paragraphs of o's tfiles
        set tc to count o's tfiles
        set firstKeyword to ":" &amp; (paragraph 1 of tKeys)
        set numCh to (length of firstKeyword) + 1
        set i to 1
        repeat while (i &lt; tc) -- check each path in the list, the same path must exists  numOfKeywords  in a row 
            set thisItem to (item i of o's tfiles)
            if thisItem ends with firstKeyword then
                set textFilepath to text 1 thru -numCh of thisItem
                set j to (i + numOfKeywords - 1)
                if j &gt; tc then exit repeat
                if (item j of o's tfiles) starts with textFilepath then -- this file contains all the keywords
                    set end of l to textFilepath --- append this path to the list
                    set i to i + numOfKeywords -- to skip items wich contains the same path
                else
                    set i to i + 1 -- next file
                end if
            else
                set i to i + 1 -- next file
            end if
        end repeat
        return l -- list of files which contains all the keywords
    end if
    return {} -- No files found
end getFilescontainingKeywords


The options of fgrep :


The --include \"*.txt\" option :  only files matching the given
filename pattern are searched, so any name which end with ".txt"

The -w option : match word only, so Bob does not match Bobby,
remove this option if you want to match a substring in the text.

The -R option :  Recursively search subdirectories, remove this
option if you don't want recursion.

Add the -i option to  perform case insensitive matching. By
default, fgrep is case sensitive.