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;;; hcel-client.el --- talks to a haskell-code-server. -*- lexical-binding: t; -*-
;; Copyright (C) 2022 Yuchen Pei.
;;
;; This file is part of hcel.
;;
;; hcel is free software: you can redistribute it and/or modify it under
;; the terms of the GNU Affero General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; hcel 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 Affero General
;; Public License for more details.
;;
;; You should have received a copy of the GNU Affero General Public
;; License along with hcel. If not, see <https://www.gnu.org/licenses/>.
(defcustom hcel-endpoint "localhost:8080"
"hcel endpoint"
:group 'hcel)
(defcustom hcel-indexed-dir "/.haskell-code-explorer"
"hcel indexed dir"
:group 'hcel)
(defvar hcel-client-buffer-name "*hcel-client*")
(defun hcel-api-packages ()
(let ((packages
(hcel-url-fetch-json (concat hcel-endpoint "/api/packages"))))
(mapcan
(lambda (package)
(mapcar
(lambda (version) (list (cons 'name (alist-get 'name package))
(cons 'version version)))
(alist-get 'versions package)))
packages)))
(defun hcel-api-package-info (package-id)
(mapcar
(lambda (tuple)
(prin1-to-string (car tuple) t))
(alist-get
'modules
(hcel-url-fetch-json (concat
hcel-endpoint "/files/" (hcel-format-package-id package-id "-")
hcel-indexed-dir "/packageInfo.json")))))
(defun hcel-api-definition-site
(package-id component-id module-name entity name)
(hcel-url-fetch-json
(concat hcel-endpoint "/api/definitionSite/"
(hcel-format-package-id package-id "-")
"/" component-id "/" module-name "/" entity "/" name)))
(defun hcel-definition-site-location-info (approx-location-info)
"Call definitionSite with info from an approximate location."
(when (string= (hcel-location-tag approx-location-info) "ExactLocation")
(error "An ExactLocation supplied."))
(when-let* ((package-id (alist-get 'packageId approx-location-info))
(component-id (alist-get 'componentId approx-location-info))
(module-name (alist-get 'moduleName approx-location-info))
(entity (alist-get 'entity approx-location-info))
(name (alist-get 'name approx-location-info)))
(hcel-api-definition-site package-id component-id module-name entity name)))
(defun hcel-api-module-info (package-id module-path)
(hcel-url-fetch-json
(concat
hcel-endpoint "/files/" (hcel-format-package-id package-id "-")
hcel-indexed-dir
"/" (replace-regexp-in-string "/" "%252F" module-path) ".json.gz")
t))
(defun hcel-api-expressions
(package-id module-path line-beg col-beg line-end col-end)
(hcel-url-fetch-json
(concat
hcel-endpoint "/api/expressions/" (hcel-format-package-id package-id "-")
"/" (replace-regexp-in-string "/" "%2F" module-path)
"/" (number-to-string (1+ line-beg))
"/" (number-to-string (1+ col-beg))
"/" (number-to-string (1+ line-end))
"/" (number-to-string (1+ col-end)))))
(defun hcel-api-hoogle-docs (package-id module-name entity name)
(hcel-url-fetch-json
(concat hcel-endpoint "/api/hoogleDocs/"
(hcel-format-package-id package-id "-") "/"
module-name "/" entity "/" name)))
(defun hcel-format-pagination-query (page per-page)
(when (or page per-page)
(concat "?"
(string-join
(list
(when page (concat "page=" page))
(when per-page (concat "per_page=" per-page)))
(when (and page per-page) "&")))))
(defun hcel-api-references (package-id name &optional page per-page)
(hcel-url-fetch-json
(concat hcel-endpoint "/api/references/"
(hcel-format-package-id package-id "-") "/"
name
(hcel-format-pagination-query page per-page))))
(defun hcel-api-identifiers (scope query package-id &optional page per-page
with-header)
(hcel-url-fetch-json
(concat hcel-endpoint
(if (eq scope 'global)
"/api/globalIdentifiers/"
(concat "/api/identifiers/"
(hcel-format-package-id package-id "-")
"/"))
query
(hcel-format-pagination-query page per-page))
nil with-header))
(defun hcel-api-global-references (name)
(hcel-url-fetch-json (concat hcel-endpoint "/api/globalReferences/" name)))
(defun hcel-parse-http-header (text)
(let ((status) (fields))
(with-temp-buffer
(insert text)
(goto-char (point-min))
(re-search-forward "^HTTP.*\\([0-9]\\{3\\}\\).*$")
(setq status (match-string 1))
(while (re-search-forward "^\\(.*?\\): \\(.*\\)$" nil t)
(push (cons (intern (match-string 1)) (match-string 2)) fields)))
(list (cons 'status status) (cons 'fields fields))))
(defun hcel-url-fetch-json (url &optional decompression with-header)
(with-current-buffer (get-buffer-create hcel-client-buffer-name)
(goto-char (point-max))
(insert "[" (current-time-string) "] Request: " url "\n"))
(with-current-buffer (url-retrieve-synchronously url t)
(let ((header) (status) (fields) (json))
(delete-http-header)
(setq header (hcel-parse-http-header (car kill-ring))
status (alist-get 'status header)
fields (alist-get 'fields header))
(with-current-buffer hcel-client-buffer-name
(insert "[" (current-time-string) "] Response: " status "\n"))
(when decompression
(call-process-region (point) (point-max) "gunzip" t t t)
(goto-char (point-min)))
(call-interactively 'delete-trailing-whitespace)
(if (string= status "200")
(unless (= (point) (point-max))
(if with-header
(list
(cons 'header fields)
(cons 'json (json-read)))
(json-read)))
(error "HTTP error: %s" (buffer-substring (point) (point-max)))))))
(provide 'hcel-client)
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