Clucy is a Clojure interface to Lucene.
To install Clucy, add the following dependency to your project.clj
file:
To use Clucy, first require it:
(ns example
(:require [clucy.core :as clucy]))
Then create an index. You can use (memory-index), which stores the search
index in RAM, or (disk-index "/path/to/a-folder"), which stores the index in
a folder on disk.
(def index (clucy/memory-index))
Next, add Clojure maps to the index:
(clucy/add index
{:name "Bob", :job "Builder"}
{:name "Donald", :job "Computer Scientist"})
You can remove maps just as easily:
(clucy/delete index
{:name "Bob", :job "Builder"})
Once maps have been added, the index can be searched:
user=> (clucy/search index "bob" 10)
({:name "Bob", :job "Builder"})
user=> (clucy/search index "scientist" 10)
({:name "Donald", :job "Computer Scientist"})
You can search and remove all in one step. To remove all of the scientists...
(clucy/search-and-delete index "job:scientist")
(ns example
(:use [clucy.core
clucy.analyzers
clucy.positions-searcher]))
(binding [*analyzer* (make-analyzer :class :en)]
(let [test-text "This is the house that Jack built.
This is the malt
That lay in the house that Jack built."
index (doto (memory-index)
(add (set-field-params
test-text
{:positions-offsets true
:vector-positions true})))
searcher (make-dict-searcher
#{"house"
"lay"
"Jack built"})
result-iter (searcher index)]
(sort-by second
(show-text-matches result-iter test-text))))=> (["house" 12] ["Jack built" 23] ["lay" 95] ["house" 106] ["Jack built" 117])
(ns example
(:use clucy.core
clucy.analyzers
clucy.document-statistics))
(binding [*analyzer* (make-analyzer :class :en)]
(let [index (doto (memory-index)
(add (set-field-params
"This is the house that Jack built.
This is the malt
That lay in the house that Jack built."
{:positions-offsets true})))
iterator (get-top-words-iterator index 2)]
{:word-count (get-word-count index)
:most-frequent (iterator)}))
=> {:word-count 8,
:most-frequent (["built" {:count 2, :pos ([130 135] [28 33])}]
["hous" {:count 2, :pos ([114 119] [12 17])}]
["jack" {:count 2, :pos ([125 129] [23 27])}])}By default all fields in a map are stored and indexed. If you would like more fine-grained control over which fields are stored and index, add this to the meta-data for your map.
(with-meta {:name "Stever", :job "Writer", :phone "555-212-0202"}
{:phone {:stored false}})
When the map above is saved to the index, the phone field will be available for searching but will not be part of map in the search results. This example is pretty contrived, this makes more sense when you are indexing something large (like the full text of a long article) and you don't want to pay the price of storing the entire text in the index.
A field called "_content" that contains all of the map's values is stored in the index for each map (excluding fields with {:stored false} in the map's metadata). This provides a default field to run all searches against. Anytime you call the search function without providing a default search field "_content" is used.
This behavior can be disabled by binding content to false, you must then specify the default search field with every search invocation.
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