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;;; Copyright © 2018 swedebugia <swedebugia@riseup.net>
;;;
;;; This file is part of guile-wikidata.
;;;
;;; guile-wikidata is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; guile-wikidata is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with guile-wikidata. If not, see <http://www.gnu.org/licenses/>.
;;; See
;;; https://www.mediawiki.org/wiki/API:Presenting_Wikidata_knowledge
;;; for a good description of workflow when integrating Wikidata into
;;; an application.
(define-module (wikidata)
#:use-module (ice-9 format)
#:use-module (ice-9 optargs)
#:use-module (json)
#:use-module (guix import json)
#:use-module (srfi srfi-1)
#:use-module (web uri)
#:export (show))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Low-level proc.
;; URI-decorators and fetching
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;TODO implement caching
(define (wdquery uri)
"Fetch the data, return an alist"
(json-fetch-alist uri))
;; Inspired by PYPI wikidata_suggest
(define* (search-uri name
#:key
(format "json")
(language "en")
(type "item")
(continue "0")
(limit "10"))
"Build URI for the Wikidata wbsearchentities API."
(let ((url "https://www.wikidata.org/w/api.php")
(& "&")
(= "=")
(action "wbsearchentities"))
(string->uri
(string-append url "?"
"search" = name &
"action" = action &
"format" = format &
"language" = language &
"type" = type &
"continue" = continue &
"limit" = limit
))))
;; Inspired by
;; https://opendata.stackexchange.com/questions/5248/how-to-get-the-name-of-a-wikidata-item
;; TODO add handling of more than one qid.
(define* (getentities-uri qid
#:optional property
#:key (language 'en)
(format 'json))
"Build URI for the Wikidata wbsearchintities API."
(let* ((url "https://www.wikidata.org/w/api.php")
(& "&")
(= "=")
(u (string-append url "?"
"ids" = qid &
"action" = "wbgetentities" &
"format" = (symbol->string format) &
"language" = (symbol->string language))))
(string->uri
(if (symbol? property)
(let ((property (symbol->string property)))
(string-append u & "props" = property))
;; No property
u))))
;; Only one at a time.
(define* (getclaims-uri qid
#:key (format 'json))
"Build URI for the Wikidata wbgetclaims API."
(let* ((url "https://www.wikidata.org/w/api.php")
(& "&")
(= "=")
(u (string-append url "?"
"entity" = qid &
"action" = "wbgetclaims" &
"format" = (symbol->string format))))
(string->uri u)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Medium-level
;; Extract from queries
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (get-label qid)
(let ((l "label"))
(first
(extract-all
(wdquery (getentities-uri qid l))))
))
(define (get-properties qid)
"Fetches and RETURNS list of all P-property keys from a qid"
(map car ;show all P only first P-statement
(cdr ; ->((p1)(p2(...)))) = list of properties
(first ; ->(claims ((p1)(p2(...))))
(wdquery
(getclaims-uri qid))))))
;;test
;;(display (map getlabel (get-properties "Q180736")))
;; TODO factorize nested alist check
(define* (extract-element alist element
#:optional (x 30))
"Accept unnested ALIST and return the value of ELEMENT.
'qid. Truncate elements to X char, default to 30 char."
(if (if (member element '("label" "description" "id")) #t #f)
;; True
(if (list? alist)
(let ((result (assoc-ref alist element)))
(if (string? result)
;; Truncate string
(if (> (string-length result) x)
(string-append (substring result 0 x) "...")
result)
(if (null? result)
(begin
(error "extract-element: No" element "found:")
(display alist))
(string-append
"(No " element " in the database)"))))
(begin
(error "extract-element: Not a proper list:" )
(display alist)))
;; Not one of the accepted elements
(error "extract-element: accepts only the strings: label, description or id")))
(define (extract-all alist)
"Extract all elements for a given unnested alist"
(if (list? alist)
(if (not (= 0 (length alist)))
`(("label" . ,(extract-element alist "label"))
("description" . ,(extract-element alist "description"))
("id" . ,(extract-element alist "id")))
(error "extract-all: Nothing found." ))
(begin
(error "extract-all: Not a proper list:")
(display alist))))
(define (pretty-print result)
"Takes an unnested alist RESULT and pretty prints it."
(format #t "~a:\t~a~%"
(extract-element result "id")
;; Join and truncate long labels and descriptions
(let* ((l (extract-element result "label"))
(d (extract-element result "description"))
(ld (string-append l ": " d))
(x 50))
(if (> (string-length ld) x)
(string-append (substring ld 0 x) "...")
ld
))))
(define (extract-search name)
"Returns list with each element being an alist of label, desc, qid"
(map extract-all (assoc-ref (wdquery (search-uri name)) "search")))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; High-level
;; Get the results fast
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (search query x)
"Extract first x results and print them in a pretty truncated way."
(let ((result (extract-search query)))
(begin
(format #t "First ~a:\tLabel & Description~%" x)
(map pretty-print (take result x))
)
))
;; For example:
;; (search "aragorn" 10)
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