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+;;; ob-C.el --- org-babel functions for C and similar languages
+
+;; Copyright (C) 2010-2012  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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Org-Babel support for evaluating C code.
+;;
+;; very limited implementation:
+;; - currently only support :results output
+;; - not much in the way of error feedback
+
+;;; Code:
+(require 'ob)
+(require 'ob-eval)
+(require 'cc-mode)
+
+(declare-function org-entry-get "org"
+		  (pom property &optional inherit literal-nil))
+
+
+(defvar org-babel-tangle-lang-exts)
+(add-to-list 'org-babel-tangle-lang-exts '("C++" . "cpp"))
+
+(defvar org-babel-default-header-args:C '())
+
+(defvar org-babel-C-compiler "gcc"
+  "Command used to compile a C source code file into an
+  executable.")
+
+(defvar org-babel-C++-compiler "g++"
+  "Command used to compile a C++ source code file into an
+  executable.")
+
+(defvar org-babel-c-variant nil
+  "Internal variable used to hold which type of C (e.g. C or C++)
+is currently being evaluated.")
+
+(defun org-babel-execute:cpp (body params)
+  "Execute BODY according to PARAMS.  This function calls
+`org-babel-execute:C++'."
+  (org-babel-execute:C++ body params))
+
+(defun org-babel-execute:C++ (body params)
+  "Execute a block of C++ code with org-babel.  This function is
+called by `org-babel-execute-src-block'."
+  (let ((org-babel-c-variant 'cpp)) (org-babel-C-execute body params)))
+
+(defun org-babel-expand-body:C++ (body params)
+  "Expand a block of C++ code with org-babel according to it's
+header arguments (calls `org-babel-C-expand')."
+  (let ((org-babel-c-variant 'cpp)) (org-babel-C-expand body params)))
+
+(defun org-babel-execute:C (body params)
+  "Execute a block of C code with org-babel.  This function is
+called by `org-babel-execute-src-block'."
+  (let ((org-babel-c-variant 'c)) (org-babel-C-execute body params)))
+
+(defun org-babel-expand-body:c (body params)
+  "Expand a block of C code with org-babel according to it's
+header arguments (calls `org-babel-C-expand')."
+  (let ((org-babel-c-variant 'c)) (org-babel-C-expand body params)))
+
+(defun org-babel-C-execute (body params)
+  "This function should only be called by `org-babel-execute:C'
+or `org-babel-execute:C++'."
+  (let* ((tmp-src-file (org-babel-temp-file
+			"C-src-"
+			(cond
+			 ((equal org-babel-c-variant 'c) ".c")
+			 ((equal org-babel-c-variant 'cpp) ".cpp"))))
+         (tmp-bin-file (org-babel-temp-file "C-bin-" org-babel-exeext))
+         (cmdline (cdr (assoc :cmdline params)))
+         (flags (cdr (assoc :flags params)))
+         (full-body (org-babel-C-expand body params))
+         (compile
+	  (progn
+	    (with-temp-file tmp-src-file (insert full-body))
+	    (org-babel-eval
+	     (format "%s -o %s %s %s"
+		     (cond
+		      ((equal org-babel-c-variant 'c) org-babel-C-compiler)
+		      ((equal org-babel-c-variant 'cpp) org-babel-C++-compiler))
+		     (org-babel-process-file-name tmp-bin-file)
+		     (mapconcat 'identity
+				(if (listp flags) flags (list flags)) " ")
+		     (org-babel-process-file-name tmp-src-file)) ""))))
+    ((lambda (results)
+       (org-babel-reassemble-table
+	(if (member "vector" (cdr (assoc :result-params params)))
+	    (let ((tmp-file (org-babel-temp-file "c-")))
+	      (with-temp-file tmp-file (insert results))
+	      (org-babel-import-elisp-from-file tmp-file))
+	  (org-babel-read results))
+	(org-babel-pick-name
+	 (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
+	(org-babel-pick-name
+	 (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params)))))
+     (org-babel-trim
+      (org-babel-eval
+       (concat tmp-bin-file (if cmdline (concat " " cmdline) "")) "")))))
+
+(defun org-babel-C-expand (body params)
+  "Expand a block of C or C++ code with org-babel according to
+it's header arguments."
+  (let ((vars (mapcar #'cdr (org-babel-get-header params :var)))
+        (main-p (not (string= (cdr (assoc :main params)) "no")))
+        (includes (or (cdr (assoc :includes params))
+                      (org-babel-read (org-entry-get nil "includes" t))))
+        (defines (org-babel-read
+                  (or (cdr (assoc :defines params))
+                      (org-babel-read (org-entry-get nil "defines" t))))))
+    (mapconcat 'identity
+	       (list
+		;; includes
+		(mapconcat
+		 (lambda (inc) (format "#include %s" inc))
+		 (if (listp includes) includes (list includes)) "\n")
+		;; defines
+		(mapconcat
+		 (lambda (inc) (format "#define %s" inc))
+		 (if (listp defines) defines (list defines)) "\n")
+		;; variables
+		(mapconcat 'org-babel-C-var-to-C vars "\n")
+		;; body
+		(if main-p
+		    (org-babel-C-ensure-main-wrap body)
+		  body) "\n") "\n")))
+
+(defun org-babel-C-ensure-main-wrap (body)
+  "Wrap body in a \"main\" function call if none exists."
+  (if (string-match "^[ \t]*[intvod]+[ \t\n\r]*main[ \t]*(.*)" body)
+      body
+    (format "int main() {\n%s\nreturn(0);\n}\n" body)))
+
+(defun org-babel-prep-session:C (session params)
+  "This function does nothing as C is a compiled language with no
+support for sessions"
+  (error "C is a compiled languages -- no support for sessions"))
+
+(defun org-babel-load-session:C (session body params)
+  "This function does nothing as C is a compiled language with no
+support for sessions"
+  (error "C is a compiled languages -- no support for sessions"))
+
+;; helper functions
+
+(defun org-babel-C-var-to-C (pair)
+  "Convert an elisp val into a string of C code specifying a var
+of the same value."
+  ;; TODO list support
+  (let ((var (car pair))
+        (val (cdr pair)))
+    (when (symbolp val)
+      (setq val (symbol-name val))
+      (when (= (length val) 1)
+        (setq val (string-to-char val))))
+    (cond
+     ((integerp val)
+      (format "int %S = %S;" var val))
+     ((floatp val)
+      (format "double %S = %S;" var val))
+     ((or (integerp val))
+      (format "char %S = '%S';" var val))
+     ((stringp val)
+      (format "char %S[%d] = \"%s\";"
+              var (+ 1 (length val)) val))
+     (t
+      (format "u32 %S = %S;" var val)))))
+
+
+(provide 'ob-C)
+
+
+
+;;; ob-C.el ends here