new image file name is the last in the directory plus one

README.md

@@ -104,10 +104,10 @@ described above.
 * If `plt.show()` is detected in code block, it will be replaced with
 `plt.savefig(..)` command and a `\includegraphics` LaTeX command will
 be added in the TeX buffer, same for Markdown. How do we determine
-which image file name to generate? All previous code in buffer is
-scanned for `plt.savefig(..)` commands, say there were 5 of them, in
-this case `show()` will be replaced with
-`plt.savefig('[file]_6.png')`,
+which image file name to generate? All previous image files with png
+extension are searched, e.g. if `test_01.png`, `test_02.png` exist,
+the new file will be the last one in the list plus 1, so in this case
+`show()` will be replaced with `plt.savefig('test_03.png')`,
 
 * After entering any expression, hit F-5 or call
 `'ipython-tex-complete-py`, and emacs-ipython will show a list of

ipython-md.py

@@ -65,10 +65,12 @@ def run_py_code():
 
     # generate savefig for execution code (no output in emacs yet)
     bc = lisp.buffer_string()
-    #plt_count_before = len(re.findall('plt\.savefig\(',bc))
-    #base = os.path.splitext(lisp.buffer_name())[0]
     base = lisp.buffer_name()[:-4]
-    plt_count_before = len(glob.glob(base + "*.png"))
+    fs = glob.glob(base + '*.png')
+    if len(fs)==0:
+        plt_count_before = 0
+    else:
+        plt_count_before =int(fs[-1][-6:-4])
     f = '%s_%s.png' % (base, two_digit(plt_count_before+1))    
     rpl = "plt.savefig('%s')" % f
     show_replaced = True if "plt.show()" in content else False

ipython-tex.py

@@ -79,7 +79,12 @@ def run_py_code():
     #plt_count_before = len(re.findall('plt\.savefig\(',bc))
     #base = os.path.splitext(lisp.buffer_name())[0]
     base = lisp.buffer_name()[:-4]
-    plt_count_before = len(glob.glob(base + "*.png"))    
+    ##plt_count_before = len(glob.glob(base + "*.png"))
+    fs = glob.glob(base + '*.png')
+    if len(fs)==0:
+        plt_count_before = 0
+    else:
+        plt_count_before =int(fs[-1][-6:-4])
     f = '%s_%s.png' % (base, two_digit(plt_count_before+1))
     rpl = "plt.savefig('%s')" % f
     show_replaced = True if "plt.show()" in content else False