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README
A haskell implementation of a sphinx full text search client. Sphinx is a very fast and featureful full-text search daemon. Version 0.4 is Compatible with sphinx version 1.1-beta Version 0.5+ is Compatible with sphinx version 2.0, but you can instead pass the version-one-one build flag. On hackage.
Usage
Constructing Queries
The data type Query
is used to represent queries to the server. It specifies
a search string and the indexes to run the query on, as well as a comment,
which may be the empty string. In order to run a query on all indexes, use
"*"
in the index field.
The convenience function query
executes a single query and constructs the
Query
by itself, so you don't have to.
To execute more than one Query
, use runQueries
. Details are below in the
section Batch Queries. To construct simple queries, you can
also use simpleQuery :: Text -> Query
which constructs a Query
over all
indexes. Don't forget that you can use record updates on a Query
.
In extended mode you may want to escape special query characters with escapeString
.
All interaction with the server, including sending queries and receiving
results, is based on the Data.Text
string type. You might therefore want to
enable the OverloadedStrings
pragma.
Excerpts and XML Indexes
buildExcerpts
creates highlighted excerpts.
You will probably need to import the types as well:
import qualified Text.Search.Sphinx as Sphinx
import qualified Text.Search.Sphinx.Types as SphinxT
There is also an Indexable
module for generating an xml file of data to be indexed.
Batch Queries
You can send more than one query per request to the server (which may enable
server-side query optimization in certain cases. Refer to the
Sphinx manual
for details.) The function runQueries
pipelines multiple queries together. If you
are trying to combine the results, there are some helpers such as
maybeQueries
and resultsToMatches
.
mr <- Sphinx.maybeQueries sphinxLogger sphinxConfig [
SphinxT.Query query1 "db1" ""
, SphinxT.Query query1 "db2" ""
, SphinxT.Query query2 "db1" ""
, SphinxT.Query query2 "db2" ""
]
case mr of
Nothing -> return Nothing
Just rs -> do
let combined = Sphinx.resultsToMatches 20 rs
if null combined
then return Nothing
else return $ Just combined
A note for those transitioning from 0.5.*
to 0.6
: the function addQueries
has been removed. You can now directly send a list of Query
to the server by using
runQueries
, which will handle the serialization for you behind the scenes.
Encoding
The sphinx server itself does not know about encodings except for the difference between single-byte encodings and multi-byte encodings. It assumes that all incoming queries are already properly encoded and matches the raw bytes it receives; the same holds for the results returned by the server. Hence the responsibilty for using the proper encoding (and decoding) routines lies with the caller.
Version 0.6.0 of haskell-sphinx-client
introduces the encoding
field in
both the Configuration
data type and the ExcerptConfiguration
data type.
The library handles proper encoding and decoding in the background; just
make sure you set the right encoding setting in the configuration!
Details
Implemenation
Implementation of API as detailed in the documentation. Most search and buildExcerpts features are implemented.
History
Originally written by Tupil and maintained by Chris Eidhof for an earlier version of sphinx. Greg Weber improved the library and updated it for the latest version of sphinx, and is now maintaining it. Aleksandar Dimitrov updated the library to use Text.
Usage of this haskell client
Tupil originally wrote this for use on a commercial project. This sphinx package is now finding some use in the Yesod community. Here is a well described example usage, but do keep in mind there is no requirement to tie the generation of sphinx documents to your web application, just your database. Used in Yesod applications yesdoweb.com and eatnutrients.com.