[LyX/master] Enable graphics generation from external gnuplot scripts.

[Tommaso Cucinotta]

commit 066edd3c30463a6c7c3a2161d204ee4101931be6
Author: Tommaso Cucinotta <tomm...@lyx.org>
Date:   Mon Oct 17 08:44:16 2016 +0200

    Enable graphics generation from external gnuplot scripts.
---
 lib/Makefile.am            |    1 +
 lib/configure.py           |    5 ++++-
 lib/scripts/gnuplot2pdf.py |   17 +++++++++++++++++
 3 files changed, 22 insertions(+), 1 deletions(-)

diff --git a/lib/Makefile.am b/lib/Makefile.am
index 66fe051..fc578a5 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -2332,6 +2332,7 @@ dist_scripts_DATA += \
        scripts/svg2pdftex.py \
        scripts/svg2pstex.py \
        scripts/fig_copy.py \
+       scripts/gnuplot2pdf.py \
        scripts/html2latexwrapper.py \
        scripts/include_bib.py \
        scripts/layout2layout.py \
diff --git a/lib/configure.py b/lib/configure.py
index f995c62..59f89f6 100644
--- a/lib/configure.py
+++ b/lib/configure.py
@@ -1045,7 +1045,10 @@ def checkConverterEntries():
         rc_entry = [ r'''\converter svg        png        "%%"    "",
 \converter svgz       png        "%%"    ""'''],
         path = ['', inkscape_path])
-
+    #
+    checkProg('Gnuplot', ['gnuplot'], 
+        rc_entry = [ r'''\Format gnuplot     "gp, gnuplot"    "Gnuplot"     "" 
"" ""  "vector" "text/plain"
+\converter gnuplot      pdf6      "python -tt $$s/scripts/gnuplot2pdf.py $$i 
$$o"    ""''' ])
     #
     # gnumeric/xls/ods to tex
     checkProg('a spreadsheet -> latex converter', ['ssconvert'],
diff --git a/lib/scripts/gnuplot2pdf.py b/lib/scripts/gnuplot2pdf.py
new file mode 100755
index 0000000..fb036b2
--- /dev/null
+++ b/lib/scripts/gnuplot2pdf.py
@@ -0,0 +1,17 @@
+#!/usr/bin/python
+
+from subprocess import Popen, PIPE
+from sys import argv, stderr, exit
+import os
+import shutil
+
+if (len(argv) != 3):
+    stderr.write("Usage: %s <src_file> <dst_file>\n" % argv[0])
+    exit(1)
+
+with open(argv[1], 'rb') as fsrc:
+    subproc = Popen("gnuplot", shell=True, stdin=PIPE)
+    subproc.stdin.write("set terminal pdf\nset output '%s'\n" % argv[2])
+    shutil.copyfileobj(fsrc, subproc.stdin)
+    subproc.stdin.write("exit\n")
+    subproc.wait()