* add part.scm (attachment handling), plot.scm (plot statistics)

guile/mu/plot.scm

@@ -0,0 +1,59 @@
+;;
+;; Copyright (C) 2011-2012 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+;;
+;; This program 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, or (at your option) any
+;; later version.
+;;
+;; This program 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 this program; if not, write to the Free Software Foundation,
+;; Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+(define-module (mu plot)
+  :use-module (mu message)
+  :use-module (ice-9 popen)
+  :export ( mu:plot-x11
+	    mu:plot-ascii))
+
+(define (export-pairs pairs)
+  "Write a temporary file with the list of PAIRS in table format, and
+return the file name."
+  (let* ((datafile (tmpnam))
+	  (output (open datafile (logior O_CREAT O_WRONLY) #O0600)))
+    (for-each
+      (lambda(pair)
+	(display (format #f "~a ~a\n" (car pair) (cdr pair)) output))
+      pairs)
+    (close output)
+    datafile))
+
+(define (mu:plot data title x-label y-label want-ascii)
+  "Plot DATA with TITLE, X-LABEL and X-LABEL. If WANT-ASCII is #t,
+output in plain-text; otherwise use an X11 window."
+  (let ((datafile (export-pairs data))
+	 (gnuplot (open-pipe "gnuplot -p" OPEN_WRITE)))
+    (display (string-append
+	       "reset\n"
+	       "set term " (if want-ascii "dumb" "x11") "\n"
+	       "set title \"" title "\"\n"
+	       "set xlabel \"" x-label "\"\n"
+	       "set ylabel \"" y-label "\"\n"
+	       "set boxwidth 0.9\n"
+	       "plot \"" datafile "\" using 2:xticlabels(1) with boxes fs solid\n")
+      gnuplot)
+  (close-pipe gnuplot)))
+
+(define* (mu:plot-ascii data #:optional (title "Title") (x-label "X") (y-label "Y"))
+  "Plot DATA with TITLE, X-LABEL and X-LABEL in plain-text."
+  (mu:plot data title x-label y-label #t))
+
+(define* (mu:plot-x11 data #:optional (title "Title") (x-label "X") (y-label "Y"))
+  "Plot DATA with TITLE, X-LABEL and X-LABEL in an X11 window."
+  (mu:plot data title x-label y-label #f))