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Editing sources
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In the project view, open the `common` directory by clicking on the triangle
on the left of `common`. This will open the directory and display a list of
source files located in this directory.
Now, double click on :file:`sdc.adb`: this will open a source editor on this
file. The source code is syntax-highlighted: keywords, comments, strings and
characters have different colors.
As with many other properties, colors are configurable in GPS:
Select the menu `Edit->Preferences...`. This will open a preferences dialog
window.
Select the `Editor->Fonts & Colors` page by clicking on the triangle next to the
item `Editor` and then selecting the `Fonts & Colors` item.
As you go over the various lines and labels, you will notice that by holding
the mouse over a label, a tool tip pops up displaying on-line help about the
selected item.
Change the background color of the `Keywords` by clicking on the last button,
at the right of the `Keywords` line.
Choose a color, e.g a light green. When you're done with the color selection,
click on `Select` in the color selection dialog.
After selecting a color, look at the effects in the source editor. If
you like the new display, click on `Close` to close dialog, otherwise
select another color.
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