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+;;; sql-indent.el --- indentation of SQL statements
+
+;; Copyright (C) 2000  Alex Schroeder
+
+;; Authors: Alex Schroeder <alex@gnu.org>
+;;          Matt Henry <mcthenry+gnu@gmail.com>
+;; Maintainer: Boerge Svingen <bsvingen@borkdal.com>
+;; Version: $Id: sql-indent.el,v 1.10 2009/03/25 22:52:25 mhenry Exp $
+
+;; Keywords: languages
+;; URL: https://github.com/bsvingen/sql-indent
+
+;; This file is not part of GNU Emacs.
+
+;; This 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 2, or (at your option)
+;; any later version.
+
+;; This 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Indent SQL statements.
+
+;; As the indentation of SQL statements depends not only on the previous
+;; line but also on the current line, empty lines cannot always be
+;; indented correctly.
+
+;; Usage note: Loading this file will make all SQL mode buffers created
+;; from then on use `sql-indent-line' for indentation.  A possible way
+;; to install sql-indent.el would be to add the following to your
+;; .emacs:
+
+;; (eval-after-load "sql"
+;;   '(load-library "sql-indent"))
+
+;; Thanks:
+;; Arcady Genkin <antipode@thpoon.com>
+
+
+;;; History:
+;; 2009-03-22*
+;;     * mhenry
+;;             Added `sql-indent-buffer' for efficient full buffer processing.
+;;             Modified `sql-indent' to be savvy to comments and strings.
+;;             Removed "and", "or" and "exists" from `sql-indent-first-column-regexp'
+;;             Added "create", "drop" and "truncate" to `sql-indent-first-column-regexp'
+
+;;; Code:
+
+(require 'sql)
+
+;; Need the following to allow GNU Emacs 19 to compile the file.
+(require 'regexp-opt)
+
+(defcustom sql-indent-first-column-regexp
+  (concat "\\(^\\s-*" (regexp-opt '(
+				    "select" "update" "insert" "delete"
+				    "union" "intersect"
+				    "from" "where" "into" "group" "having" "order"
+				    "set"
+				    "create" "drop" "truncate"
+				    "--") t) "\\(\\b\\|\\s-\\)\\)\\|\\(^```$\\)")
+  "Regexp matching keywords relevant for indentation.
+The regexp matches lines which start SQL statements and it matches lines
+that should be indented at the same column as the start of the SQL
+statement.  The regexp is created at compile-time.  Take a look at the
+source before changing it.  All lines not matching this regexp will be
+indented by `sql-indent-offset'."
+  :type 'regexp
+  :group 'SQL)
+
+(defcustom sql-indent-offset 4
+  "*Offset for SQL indentation."
+  :type 'number
+  :group 'SQL)
+
+
+(defvar sql-indent-debug nil
+  "If non-nil, `sql-indent-line' will output debugging messages.")
+
+(defun sql-indent-is-string-or-comment ()
+  "Return nil if point is not in a comment or string; non-nil otherwise."
+  (let ((parse-state (syntax-ppss)))
+    (or (nth 3 parse-state)             ; String
+	(nth 4 parse-state)))           ; Comment
+  )
+
+(defun sql-indent-get-last-line-start ()
+  "Find the last non-blank line.  Return the beginning position of that line and its indentation."
+
+  (save-excursion
+    (forward-line -1)
+
+    (while (and (not (bobp))
+		(or
+		 (looking-at "^\\s-*$")
+		 (sql-indent-is-string-or-comment)) ; Skip comments or strings
+		)
+
+      (forward-line -1))
+    (list (point) (current-indentation))
+    )
+  )
+
+(defun sql-indent-level-delta (&optional prev-start prev-indent)
+  "Calculate the change in level from the previous non-blank line.
+Given the optional parameter `PREV-START' and `PREV-INDENT', assume that to be
+the previous non-blank line.
+Return a list containing the level change and the previous indentation."
+
+  (save-excursion
+    ;; Go back to the previous non-blank line
+    (let* ((p-line (cond ((and prev-start prev-indent)
+			  (list prev-start prev-indent))
+			 ((sql-indent-get-last-line-start))))
+	   (curr-start (point-at-bol))
+	   (paren (nth 0 (parse-partial-sexp (nth 0 p-line) curr-start))))
+
+      ;; Add opening or closing parens.
+      ;; If the current line starts with a keyword statement (e.g. SELECT, FROM, ...) back up one level
+      ;; If the previous line starts with a keyword statement then add one level
+
+      (list
+       (+ paren
+	  (if (progn (goto-char (nth 0 p-line))
+		     (looking-at sql-indent-first-column-regexp))
+	      1
+	    0)
+	  (if (progn (goto-char curr-start)
+		     (looking-at sql-indent-first-column-regexp))
+	      -1
+	    0)
+	  )
+       (nth 1 p-line))
+      )
+    )
+  )
+
+(defun sql-indent-buffer ()
+  "Indent the buffer's SQL statements."
+  (interactive)
+  (save-excursion
+    (goto-char (point-min))
+    (while (/= (point) (point-max))
+	(forward-line)
+	(sql-indent-line)
+	(end-of-line))))
+
+(defun sql-indent-line ()
+  "Indent current line in an SQL statement."
+  (interactive)
+  (let* ((pos (point))
+	 (indent-info (sql-indent-level-delta))
+	 (level-delta (nth 0 indent-info))
+	 (prev-indent (nth 1 indent-info))
+	 (this-indent (max 0            ; Make sure the indentation is at least 0
+			   (+ prev-indent
+			      (* sql-indent-offset
+				 (nth 0 indent-info)))))
+	 )
+
+    (if sql-indent-debug
+	(message "SQL Indent: line: %3d, level delta: %3d; prev: %3d; this: %3d"
+		 (line-number-at-pos) level-delta prev-indent this-indent))
+
+    (save-excursion
+
+      (beginning-of-line)
+
+      (if (and (not (looking-at "^\\s-*$")) ; Leave blank lines alone
+	       (not (sql-indent-is-string-or-comment))  ; Don't mess with comments or strings
+	       (/= this-indent (current-indentation))) ; Don't change the line if already ok.
+	  (indent-line-to this-indent))
+      )
+    )
+  )
+
+(add-hook 'sql-mode-hook
+	  (function (lambda ()
+		      (make-local-variable 'indent-line-function)
+		      (setq indent-line-function 'sql-indent-line))))
+
+(provide 'sql-indent)
+
+;;; sql-indent.el ends here