Set settings local to a single buffer. A more granular approach to settings than the per file type .sublime-settings files.
Inspired in Vim's modelines feature.
Download and install SublimeModelines.
See the installation instructions for .sublime-packages.
Buffers will be scanned .on_load() for modelines and settings will be set accordingly. Settings will apply only to the buffer declaring them.
How to Declare Modelines
Modelines must be declared at the top or the bottom of source code files with one of the following syntaxes:
# sublime: option_name value # sublime: option_name value; another_option value; third_option value
Note: # is the default comment character. Use the corresponding single-line comment character for your language. When there isn't a concept of comment, the default comment character must be used.
How to Define Comment Characters in Sublime Text
SublimeModelines finds the appropriate single-line comment character by inspecting the shellVariables preference, which must be defined in a .tmPreferences file. To see an example of how this is done, open Packages/Python/Miscellaneous.tmPreferences.
Many packages giving support for programming languages already include this, but you might need to create a .tmPreferences file for the language you're working with if you want SublimeModelines to be available.
If the option's value contains a semicolon (;), make sure it isn't followed by a blank space. Otherwise it will be interpreted as a multioption separator.