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lisp/org/ob-julia.el

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+;;; ob-julia.el --- org-babel functions for julia code evaluation  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2013-2021 Free Software Foundation, Inc.
+;; Authors: G. Jay Kerns
+;; Maintainer: Pedro Bruel <pedro.bruel@gmail.com>
+;; Keywords: literate programming, reproducible research, scientific computing
+;; Homepage: https://github.com/phrb/ob-julia
+
+;; 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 julia code
+;;
+;; Based on ob-R.el by Eric Schulte and Dan Davison.
+
+;;; Code:
+(require 'cl-lib)
+(require 'ob)
+
+(declare-function orgtbl-to-csv "org-table" (table params))
+(declare-function julia "ext:ess-julia" (&optional start-args))
+(declare-function inferior-ess-send-input "ext:ess-inf" ())
+(declare-function ess-make-buffer-current "ext:ess-inf" ())
+(declare-function ess-eval-buffer "ext:ess-inf" (vis))
+(declare-function ess-wait-for-process "ext:ess-inf"
+		  (&optional proc sec-prompt wait force-redisplay))
+
+(defvar org-babel-header-args:julia
+  '((width		 . :any)
+    (horizontal		 . :any)
+    (results             . ((file list vector table scalar verbatim)
+			    (raw org html latex code pp wrap)
+			    (replace silent append prepend)
+			    (output value graphics))))
+  "Julia-specific header arguments.")
+
+(add-to-list 'org-babel-tangle-lang-exts '("julia" . "jl"))
+
+(defvar org-babel-default-header-args:julia '())
+
+(defcustom org-babel-julia-command "julia"
+  "Name of command to use for executing julia code."
+  :version "24.3"
+  :package-version '(Org . "8.0")
+  :group 'org-babel
+  :type 'string)
+
+(defvar ess-current-process-name) ; dynamically scoped
+(defvar ess-local-process-name)   ; dynamically scoped
+(defvar ess-eval-visibly-p)       ; dynamically scoped
+(defun org-babel-edit-prep:julia (info)
+  (let ((session (cdr (assq :session (nth 2 info)))))
+    (when (and session
+	       (string-prefix-p "*"  session)
+	       (string-suffix-p "*" session))
+      (org-babel-julia-initiate-session session nil))))
+
+(defun org-babel-expand-body:julia (body params &optional _graphics-file)
+  "Expand BODY according to PARAMS, return the expanded body."
+  (mapconcat #'identity
+	     (append
+	      (when (cdr (assq :prologue params))
+		(list (cdr (assq :prologue params))))
+	      (org-babel-variable-assignments:julia params)
+	      (list body)
+	      (when (cdr (assq :epilogue params))
+		(list (cdr (assq :epilogue params)))))
+	     "\n"))
+
+(defun org-babel-execute:julia (body params)
+  "Execute a block of julia code.
+This function is called by `org-babel-execute-src-block'."
+  (save-excursion
+    (let* ((result-params (cdr (assq :result-params params)))
+	   (result-type (cdr (assq :result-type params)))
+           (session (org-babel-julia-initiate-session
+		     (cdr (assq :session params)) params))
+	   (graphics-file (and (member "graphics" (assq :result-params params))
+			       (org-babel-graphical-output-file params)))
+	   (colnames-p (unless graphics-file (cdr (assq :colnames params))))
+	   (full-body (org-babel-expand-body:julia body params graphics-file))
+	   (result
+	    (org-babel-julia-evaluate
+	     session full-body result-type result-params
+	     (or (equal "yes" colnames-p)
+		 (org-babel-pick-name
+		  (cdr (assq :colname-names params)) colnames-p)))))
+      (if graphics-file nil result))))
+
+(defun org-babel-normalize-newline (result)
+  (replace-regexp-in-string
+   "\\(\n\r?\\)\\{2,\\}"
+   "\n"
+   result))
+
+(defun org-babel-prep-session:julia (session params)
+  "Prepare SESSION according to the header arguments specified in PARAMS."
+  (let* ((session (org-babel-julia-initiate-session session params))
+	 (var-lines (org-babel-variable-assignments:julia params)))
+    (org-babel-comint-in-buffer session
+      (mapc (lambda (var)
+              (end-of-line 1) (insert var) (comint-send-input nil t)
+              (org-babel-comint-wait-for-output session)) var-lines))
+    session))
+
+(defun org-babel-load-session:julia (session body params)
+  "Load BODY into SESSION."
+  (save-window-excursion
+    (let ((buffer (org-babel-prep-session:julia session params)))
+      (with-current-buffer buffer
+        (goto-char (process-mark (get-buffer-process (current-buffer))))
+        (insert (org-babel-chomp body)))
+      buffer)))
+
+;; helper functions
+
+(defun org-babel-variable-assignments:julia (params)
+  "Return list of julia statements assigning the block's variables."
+  (let ((vars (org-babel--get-vars params)))
+    (mapcar
+     (lambda (pair) (org-babel-julia-assign-elisp (car pair) (cdr pair)))
+     (mapcar
+      (lambda (i)
+	(cons (car (nth i vars))
+	      (org-babel-reassemble-table
+	       (cdr (nth i vars))
+	       (cdr (nth i (cdr (assq :colname-names params))))
+	       (cdr (nth i (cdr (assq :rowname-names params)))))))
+      (number-sequence 0 (1- (length vars)))))))
+
+(defun org-babel-julia-quote-csv-field (s)
+  "Quote field S for export to julia."
+  (if (stringp s)
+      (concat "\"" (mapconcat #'identity (split-string s "\"") "\"\"") "\"")
+    (format "%S" s)))
+
+(defun org-babel-julia-assign-elisp (name value)
+  "Construct julia code assigning the elisp VALUE to a variable named NAME."
+  (if (listp value)
+      (let* ((lengths (mapcar #'length (cl-remove-if-not #'sequencep value)))
+             (max (if lengths (apply #'max lengths) 0))
+             (min (if lengths (apply #'min lengths) 0)))
+        ;; Ensure VALUE has an orgtbl structure (depth of at least 2).
+        (unless (listp (car value)) (setq value (list value)))
+        (let ((file (orgtbl-to-csv value '(:fmt org-babel-julia-quote-csv-field))))
+          (if (= max min)
+              (format "%s = begin
+    using CSV
+    CSV.read(\"%s\")
+end" name file)
+            (format "%s = begin
+    using CSV
+    CSV.read(\"%s\")
+end"
+                    name file))))
+    (format "%s = %s" name (org-babel-julia-quote-csv-field value))))
+
+(defvar ess-ask-for-ess-directory) ; dynamically scoped
+(defun org-babel-julia-initiate-session (session params)
+  "If there is not a current julia process then create one."
+  (unless (string= session "none")
+    (let ((session (or session "*Julia*"))
+	  (ess-ask-for-ess-directory
+	   (and (bound-and-true-p ess-ask-for-ess-directory)
+                (not (cdr (assq :dir params))))))
+      (if (org-babel-comint-buffer-livep session)
+	  session
+	;; FIXME: Depending on `display-buffer-alist', (julia) may end up
+        ;; popping up a new frame which `save-window-excursion' won't be able
+        ;; to "undo", so we really should call a kind of
+        ;; `julia-no-select' instead so we don't need to undo any
+        ;; window-changes afterwards.
+	(save-window-excursion
+	  (when (get-buffer session)
+	    ;; Session buffer exists, but with dead process
+	    (set-buffer session))
+          (require 'ess) (set-buffer (julia))
+	  (rename-buffer
+	   (if (bufferp session)
+	       (buffer-name session)
+	     (if (stringp session)
+		 session
+	       (buffer-name))))
+	  (current-buffer))))))
+
+(defun org-babel-julia-graphical-output-file (params)
+  "Name of file to which julia should send graphical output."
+  (and (member "graphics" (cdr (assq :result-params params)))
+       (cdr (assq :file params))))
+
+(defconst org-babel-julia-eoe-indicator "print(\"org_babel_julia_eoe\")")
+(defconst org-babel-julia-eoe-output "org_babel_julia_eoe")
+
+(defconst org-babel-julia-write-object-command "begin
+    local p_ans = %s
+    local p_tmp_file = \"%s\"
+
+    try
+        using CSV, DataFrames
+
+        if typeof(p_ans) <: DataFrame
+           p_ans_df = p_ans
+        else
+            p_ans_df = DataFrame(:ans => p_ans)
+        end
+
+        CSV.write(p_tmp_file,
+                  p_ans_df,
+                  writeheader = %s,
+                  transform = (col, val) -> something(val, missing),
+                  missingstring = \"nil\",
+                  quotestrings = false)
+        p_ans
+    catch e
+        err_msg = \"Source block evaluation failed. $e\"
+        CSV.write(p_tmp_file,
+                  DataFrame(:ans => err_msg),
+                  writeheader = false,
+                  transform = (col, val) -> something(val, missing),
+                  missingstring = \"nil\",
+                  quotestrings = false)
+
+        err_msg
+    end
+end")
+
+(defun org-babel-julia-evaluate
+    (session body result-type result-params column-names-p)
+  "Evaluate julia code in BODY."
+  (if session
+      (org-babel-julia-evaluate-session
+       session body result-type result-params column-names-p)
+    (org-babel-julia-evaluate-external-process
+     body result-type result-params column-names-p)))
+
+(defun org-babel-julia-evaluate-external-process
+    (body result-type result-params column-names-p)
+  "Evaluate BODY in external julia process.
+If RESULT-TYPE equals 'output then return standard output as a
+string.  If RESULT-TYPE equals 'value then return the value of the
+last statement in BODY, as elisp."
+  (cl-case result-type
+    (value
+     (let ((tmp-file (org-babel-temp-file "julia-")))
+       (org-babel-eval org-babel-julia-command
+		       (format org-babel-julia-write-object-command
+			       (format "begin %s end" body)
+			       (org-babel-process-file-name tmp-file 'noquote)
+                               (if column-names-p "true" "false")
+                               ))
+       (org-babel-julia-process-value-result
+	(org-babel-result-cond result-params
+	  (with-temp-buffer
+	    (insert-file-contents tmp-file)
+	    (buffer-string))
+	  (org-babel-import-elisp-from-file tmp-file '(4)))
+	column-names-p)))
+    (output (org-babel-eval org-babel-julia-command body))))
+
+(defun org-babel-julia-evaluate-session
+    (session body result-type result-params column-names-p)
+  "Evaluate BODY in SESSION.
+If RESULT-TYPE equals 'output then return standard output as a
+string.  If RESULT-TYPE equals 'value then return the value of the
+last statement in BODY, as elisp."
+  (cl-case result-type
+    (value
+     (with-temp-buffer
+       (insert (org-babel-chomp body))
+       (let ((ess-local-process-name
+	      (process-name (get-buffer-process session)))
+	     (ess-eval-visibly-p nil))
+	 (ess-eval-buffer nil)))
+     (let ((tmp-file (org-babel-temp-file "julia-")))
+       (org-babel-comint-eval-invisibly-and-wait-for-file
+	session tmp-file
+	(format org-babel-julia-write-object-command
+                "ans"
+		(org-babel-process-file-name tmp-file 'noquote)
+                (if column-names-p "true" "false")
+                ))
+       (org-babel-julia-process-value-result
+	(org-babel-result-cond result-params
+	  (with-temp-buffer
+	    (insert-file-contents tmp-file)
+	    (buffer-string))
+	  (org-babel-import-elisp-from-file tmp-file '(4)))
+	column-names-p)))
+    (output
+     (mapconcat
+      #'org-babel-chomp
+      (butlast
+       (delq nil
+	     (mapcar
+	      (lambda (line) (when (> (length line) 0) line))
+	      (mapcar
+	       (lambda (line) ;; cleanup extra prompts left in output
+		 (if (string-match
+		      "^\\([>+.]\\([ ][>.+]\\)*[ ]\\)"
+		      (car (split-string line "\n")))
+		     (substring line (match-end 1))
+		   line))
+	       (org-babel-comint-with-output (session org-babel-julia-eoe-output)
+		 (insert (mapconcat #'org-babel-chomp
+				    (list body org-babel-julia-eoe-indicator)
+				    "\n"))
+                 (inferior-ess-send-input))))))
+      "\n"))))
+
+(defun org-babel-julia-process-value-result (result column-names-p)
+  "Julia-specific processing of return value.
+Insert hline if column names in output have been requested."
+  (if column-names-p
+      (cons (car result) (cons 'hline (cdr result)))
+    result))
+
+(provide 'ob-julia)
+
+;;; ob-julia.el ends here