135 lines
4.4 KiB
EmacsLisp
135 lines
4.4 KiB
EmacsLisp
;;; ob-sqlite.el --- org-babel functions for sqlite database interaction
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;; Copyright (C) 2010 Free Software Foundation
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research
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;; Homepage: http://orgmode.org
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;; Version: 0.01
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Org-Babel support for evaluating sqlite source code.
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;;; Code:
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(require 'ob)
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(require 'ob-ref)
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(declare-function org-fill-template "org" (template alist))
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(declare-function org-table-convert-region
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"org-table" (beg0 end0 &optional separator))
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(defvar org-babel-default-header-args:sqlite '())
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(defvar org-babel-header-arg-names:sqlite
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'(db header echo bail csv column html line list separator nullvalue)
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"Sqlite specific header args.")
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(defun org-babel-expand-body:sqlite
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(body params &optional processed-params) body)
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(defvar org-babel-sqlite3-command "sqlite3")
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(defun org-babel-execute:sqlite (body params)
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"Execute a block of Sqlite code with org-babel. This function is
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called by `org-babel-execute-src-block'."
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(message "executing Sqlite source code block")
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(let ((result-params (split-string (or (cdr (assoc :results params)) "")))
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(vars (org-babel-ref-variables params))
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(db (cdr (assoc :db params)))
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(separator (cdr (assoc :separator params)))
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(nullvalue (cdr (assoc :nullvalue params)))
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(headers-p (equal "yes" (cdr (assoc :colnames params))))
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(others (delq nil (mapcar
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(lambda (arg) (car (assoc arg params)))
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(list :header :echo :bail :column
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:csv :html :line :list))))
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exit-code)
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(message "others:%s" others)
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(unless db (error "ob-sqlite: can't evaluate without a database."))
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(with-temp-buffer
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(insert
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(shell-command-to-string
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(org-fill-template
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"%cmd %header %separator %nullvalue %others %csv %db %body"
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(list
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(cons "cmd" org-babel-sqlite3-command)
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(cons "header" (if headers-p "-header" "-noheader"))
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(cons "separator"
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(if separator (format "-separator %s" separator) ""))
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(cons "nullvalue"
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(if nullvalue (format "-nullvalue %s" nullvalue) ""))
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(cons "others"
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(mapconcat
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(lambda (arg) (format "-%s" (substring (symbol-name arg) 1)))
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others " "))
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;; for easy table parsing, default header type should be -csv
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(cons "csv" (if (or (member :csv others) (member :column others)
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(member :line others) (member :list others)
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(member :html others) separator)
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""
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"-csv"))
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(cons "db " db)
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(cons "body" (format "%S" (org-babel-sqlite-expand-vars
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body vars)))))))
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(if (or (member "scalar" result-params)
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(member "html" result-params)
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(member "code" result-params))
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(buffer-string)
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(org-table-convert-region (point-min) (point-max))
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(org-babel-sqlite-table-or-scalar
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(org-babel-sqlite-offset-colnames
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(org-table-to-lisp) headers-p))))))
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(defun org-babel-sqlite-expand-vars (body vars)
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"Expand the variables held in VARS in BODY."
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(mapc
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(lambda (pair)
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(setq body (replace-regexp-in-string
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(format "\$%s" (car pair))
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(format "%S" (cdr pair))
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body)))
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vars)
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body)
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(defun org-babel-sqlite-table-or-scalar (result)
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"If RESULT looks like a trivial table, then unwrap it."
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(if (and (equal 1 (length result))
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(equal 1 (length (car result))))
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(org-babel-read (caar result))
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(mapcar (lambda (row)
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(if (equal 'hline row)
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'hline
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(mapcar #'org-babel-read row))) result)))
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(defun org-babel-sqlite-offset-colnames (table headers-p)
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"If HEADERS-P is non-nil then offset the first row as column names."
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(if headers-p
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(cons (car table) (cons 'hline (cdr table)))
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table))
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(defun org-babel-prep-session:sqlite (session params)
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"Prepare SESSION according to the header arguments specified in PARAMS."
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(error "sqlite sessions not yet implemented"))
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(provide 'ob-sqlite)
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;; arch-tag: 5c03d7f2-0f72-48b8-bbd1-35aafea248ac
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;;; ob-sqlite.el ends here
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