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;;; ob-sqlite.el --- Babel Functions for SQLite Databases -*- lexical-binding: t; -*-
;; Copyright (C) 2010-2018 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Org-Babel support for evaluating sqlite source code.
;;; Code:
(require 'ob)
(declare-function org-fill-template "org" (template alist))
(declare-function org-table-convert-region "org-table"
(beg0 end0 &optional separator))
(declare-function orgtbl-to-csv "org-table" (table params))
(declare-function org-table-to-lisp "org-table" (&optional txt))
(defvar org-babel-default-header-args:sqlite '())
(defvar org-babel-header-args:sqlite
'((db . :any)
(header . :any)
(echo . :any)
(bail . :any)
(csv . :any)
(column . :any)
(html . :any)
(line . :any)
(list . :any)
(separator . :any)
(nullvalue . :any))
"Sqlite specific header args.")
(defun org-babel-expand-body:sqlite (body params)
"Expand BODY according to the values of PARAMS."
(org-babel-sqlite-expand-vars
body (org-babel--get-vars params)))
(defvar org-babel-sqlite3-command "sqlite3")
(defun org-babel-execute:sqlite (body params)
"Execute a block of Sqlite code with Babel.
This function is called by `org-babel-execute-src-block'."
(let ((result-params (split-string (or (cdr (assq :results params)) "")))
(db (cdr (assq :db params)))
(separator (cdr (assq :separator params)))
(nullvalue (cdr (assq :nullvalue params)))
(headers-p (equal "yes" (cdr (assq :colnames params))))
(others (delq nil (mapcar
(lambda (arg) (car (assq arg params)))
(list :header :echo :bail :column
:csv :html :line :list)))))
(unless db (error "ob-sqlite: can't evaluate without a database"))
(with-temp-buffer
(insert
(org-babel-eval
(org-fill-template
"%cmd %header %separator %nullvalue %others %csv %db "
(list
(cons "cmd" org-babel-sqlite3-command)
(cons "header" (if headers-p "-header" "-noheader"))
(cons "separator"
(if separator (format "-separator %s" separator) ""))
(cons "nullvalue"
(if nullvalue (format "-nullvalue %s" nullvalue) ""))
(cons "others"
(mapconcat
(lambda (arg) (format "-%s" (substring (symbol-name arg) 1)))
others " "))
;; for easy table parsing, default header type should be -csv
(cons "csv" (if (or (member :csv others) (member :column others)
(member :line others) (member :list others)
(member :html others) separator)
""
"-csv"))
(cons "db " db)))
;; body of the code block
(org-babel-expand-body:sqlite body params)))
(org-babel-result-cond result-params
(buffer-string)
(if (equal (point-min) (point-max))
""
(org-table-convert-region (point-min) (point-max)
(if (or (member :csv others)
(member :column others)
(member :line others)
(member :list others)
(member :html others) separator)
nil
'(4)))
(org-babel-sqlite-table-or-scalar
(org-babel-sqlite-offset-colnames
(org-table-to-lisp) headers-p)))))))
(defun org-babel-sqlite-expand-vars (body vars)
"Expand the variables held in VARS in BODY."
;; FIXME: Redundancy with org-babel-sql-expand-vars!
(mapc
(lambda (pair)
(setq body
(replace-regexp-in-string
(format "$%s" (car pair))
(let ((val (cdr pair)))
(if (listp val)
(let ((data-file (org-babel-temp-file "sqlite-data-")))
(with-temp-file data-file
(insert (orgtbl-to-csv val nil)))
data-file)
(if (stringp val) val (format "%S" val))))
body)))
vars)
body)
(defun org-babel-sqlite-table-or-scalar (result)
"If RESULT looks like a trivial table, then unwrap it."
(if (and (equal 1 (length result))
(equal 1 (length (car result))))
(org-babel-read (caar result))
(mapcar (lambda (row)
(if (eq 'hline row)
'hline
(mapcar #'org-babel-string-read row))) result)))
(defun org-babel-sqlite-offset-colnames (table headers-p)
"If HEADERS-P is non-nil then offset the first row as column names."
(if headers-p
(cons (car table) (cons 'hline (cdr table)))
table))
(defun org-babel-prep-session:sqlite (_session _params)
"Raise an error because support for SQLite sessions isn't implemented.
Prepare SESSION according to the header arguments specified in PARAMS."
(error "SQLite sessions not yet implemented"))
(provide 'ob-sqlite)
;;; ob-sqlite.el ends here
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