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authorLuke Shumaker <LukeShu@sbcglobal.net>2011-04-13 23:20:15 -0400
committerLuke Shumaker <LukeShu@sbcglobal.net>2011-04-13 23:20:15 -0400
commitf7464fdd2e33e5dc6c159a4adc8f53902e6d4511 (patch)
treeb1d65db982af54cc2088de3228174c4ea710c2f4 /.emacs.d/org-7.4/lisp/ob-sqlite.el
Initial commit of Luke Shumaker's "dot-files".
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+;;; ob-sqlite.el --- org-babel functions for sqlite database interaction
+
+;; Copyright (C) 2010 Free Software Foundation
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+;; Version: 7.4
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Org-Babel support for evaluating sqlite source code.
+
+;;; Code:
+(require 'ob)
+(require 'ob-eval)
+(require 'ob-ref)
+
+(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))
+
+(defvar org-babel-default-header-args:sqlite '())
+
+(defvar org-babel-header-arg-names:sqlite
+ '(db header echo bail csv column html line list separator nullvalue)
+ "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 (mapcar #'cdr (org-babel-get-header params :var))))
+
+(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 (assoc :results params)) "")))
+ (db (cdr (assoc :db params)))
+ (separator (cdr (assoc :separator params)))
+ (nullvalue (cdr (assoc :nullvalue params)))
+ (headers-p (equal "yes" (cdr (assoc :colnames params))))
+ (others (delq nil (mapcar
+ (lambda (arg) (car (assoc arg params)))
+ (list :header :echo :bail :column
+ :csv :html :line :list))))
+ exit-code)
+ (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)))
+ (if (or (member "scalar" result-params)
+ (member "html" result-params)
+ (member "code" result-params)
+ (equal (point-min) (point-max)))
+ (buffer-string)
+ (org-table-convert-region (point-min) (point-max))
+ (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."
+ (mapc
+ (lambda (pair)
+ (setq body
+ (replace-regexp-in-string
+ (format "\$%s" (car pair))
+ ((lambda (val)
+ (if (listp val)
+ ((lambda (data-file)
+ (with-temp-file data-file
+ (insert (orgtbl-to-csv
+ val '(:fmt (lambda (el) (if (stringp el)
+ el
+ (format "%S" el)))))))
+ data-file)
+ (org-babel-temp-file "sqlite-data-"))
+ (if (stringp val) val (format "%S" val))))
+ (cdr pair))
+ 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 (equal 'hline row)
+ 'hline
+ (mapcar #'org-babel-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)
+
+;; arch-tag: 5c03d7f2-0f72-48b8-bbd1-35aafea248ac
+
+;;; ob-sqlite.el ends here