Why can't I add a variable to GIMP plugin?

Question

Ok, I am trying to develop a small plugin for gimp that makes a bitmap font. For some reason now that I added the following code it won't work.

current_cell_x = 0
current_cell_y = 0

x_pos = current_cell_x * cwidth
y_pos = current_cell_y * cheight

x_pos += cwidth / 2.0
y_pos += cheight / 2.0

x_pos -= text_layer.width / 2.0
y_pos -= text_layer.height / 2.0

Even just the first line with 'current_cell_x = 0' is enough to make the entire plugin not work.

Here is all the code in a working format:

from gimpfu import *

def create_font(cwidth, cheight, xcells, ycells, font, size, color) :

    char_begin = 32
    char_end = 127
    num_chars = char_end - char_begin

    #current_cell_x = 0
    #current_cell_y = 0

    # Figure out total width & height
    twidth = int(cwidth * xcells)
    theight = int(cheight * ycells)

    # Create Image
    img = gimp.Image(twidth, theight, RGB)
    img.disable_undo()

    # Save the current foreground color:
    pdb.gimp_context_push()

    # Set the text color & background color
    gimp.set_foreground(color)
    gimp.set_background(0, 0, 0)

    # Create All Layers & Position Accordingly
    for i in range(char_begin, char_end):
        string = '%c' % i
        offset = i - char_begin
        text_layer = pdb.gimp_text_fontname(img, None, 0, 0, string, -1, True, size, PIXELS, font)

        #x_pos = current_cell_x * cwidth
        #y_pos = current_cell_y * cheight

        #x_pos += cwidth / 2.0
        #y_pos += cheight / 2.0

        #x_pos -= text_layer.width / 2.0
        #y_pos -= text_layer.height / 2.0

    #pdb.gimp_image_flatten(img)

    img.enable_undo()

    # Create a new image window
    gimp.Display(img)
    # Show the new image window
    gimp.displays_flush()

    # Restore the old foreground color:
    pdb.gimp_context_pop()

register(
    "python_fu_bitmap_font",
    "Bitmap Font",
    "Create a new bitmap font",
    "*****",
    "*****",
    "2013",
    "Bitmap Font (Py)...",
    "",      # Create a new image, don't work on an existing one
    [
        (PF_SPINNER, "cwidth", "Cell Width", 24, (1, 3000, 1)),
        (PF_SPINNER, "cheight", "Cell Height", 51, (1, 3000, 1)),
        (PF_SPINNER, "xcells", "Cells on X axis", 10, (1, 3000, 1)),
        (PF_SPINNER, "ycells", "Cells on Y axis", 10, (1, 3000, 1)),
        (PF_FONT, "font", "Font face", "Consolas"),
        (PF_SPINNER, "size", "Font size", 50, (1, 3000, 1)),
        (PF_COLOR, "color", "Text color", (1.0, 0.0, 0.0))
    ],
    [],
    create_font, menu="<Image>/File/Create")

main()

However, when I un-comment lines 9 - 10 & lines 33 - 40 I get the following errors.

I wanted my final code to look something like this:

def create_font(cwidth, cheight, xcells, ycells, font, size, color) :

    char_begin = 32
    char_end = 127
    num_chars = char_end - char_begin

    current_cell_x = 0
    current_cell_y = 0

    # Figure out total width & height
    twidth = int(cwidth * xcells)
    theight = int(cheight * ycells)

    # Create Image
    img = gimp.Image(twidth, theight, RGB)
    img.disable_undo()

    # Save the current foreground color:
    pdb.gimp_context_push()

    # Set the text color & background color
    gimp.set_foreground(color)
    gimp.set_background(0, 0, 0)

    # Create All Layers & Position Accordingly
    for i in range(char_begin, char_end):
        string = '%c' % i

        text_layer = pdb.gimp_text_fontname(img, None, 0, 0, string, -1, True, size, PIXELS, font)
        pdb.plug_in_autocrop_layer(0, img, text_layer)

        x_pos = float(current_cell_x * cwidth)
        y_pos = float(current_cell_y * cheight)

        x_pos += float(cwidth) / 2.0
        y_pos += float(cheight) / 2.0

        x_pos -= float(text_layer.width) / 2.0
        y_pos -= float(text_layer.height) / 2.0

        text_layer.translate(x_pos, y_pos)

        #Set current cell
        current_cell_x += 1
        if current_cell_x > xcells:
            current_cell_x = 0
            current_cell_y += 1
        if current_cell_y > ycells:
            break

        gimp.progress_update(float(offset) / float(num_chars))

    #pdb.gimp_image_flatten(img) # Don't do this

    img.enable_undo()

    # Create a new image window
    gimp.Display(img)
    # Show the new image window
    gimp.displays_flush()

    # Restore the old foreground color:
    pdb.gimp_context_pop()

If you see any suggestions as far as that goes, I wouldn't mind.

Note: Got my code from - https://github.com/sole/snippets/blob/master/gimp/generate_bitmap_font/sole_generate_bitmap_font.py and http://gimpbook.com/scripting/

---

Ran 'python -tt plugin.py' and got the following:

Answer 1

I had inconsistent indentation I needed to go to Settings>Preferences>Language Menu/Tab Settings>Tab Settings and then check Replace by space.

Then I needed to run

python -tt yourscript.py

Which allowed me to get rid of all the indention errors that were caused by my edior.

I also used reindent.py from the Python33/Tools/Scripts folder, but it did not work for me. It may have helped in someway I did not see.

Matthias was halfway right, but he did not submit an answer. I am doing that in his place.