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Appendix D: Emacs Octave Support 339• the builtin operators (‘&&’, ‘’, . . .) using font-lock-reference-face• the builtin variables (such as ‘warn_fortran_indexing’, ‘NaN’ or ‘LOADPATH’) in fontlock-variable-name-face• and the function names in function declarations in font-lock-function-name-face.There is also rudimentary support for Imenu (currently, function names can be indexed).You can generate TAGS files for Emacs from Octave ‘.m’ files using the shell script otagsthat is installed alongside your copy of Octave.Customization of Octave mode can be performed by modification of the variable octavemode-hook.If the value of this variable is non-nil, turning on Octave mode calls its value.If you discover a problem with Octave mode, you can conveniently send a bug reportusing C-c C-b (octave-submit-bug-report). This automatically sets up a mail bufferwith version information already added. You just need to add a description of the problem,including a reproducible test case and send the message.D.3 Running Octave From Within EmacsThe package ‘octave’ provides commands for running an inferior Octave process in aspecial Emacs buffer. UseM-x run-octaveto directly start an inferior Octave process. If Emacs does not know about this command,add the line(autoload ’run-octave "octave-inf" nil t)to your ‘.emacs’ file.This will start Octave in a special buffer the name of which is specified by the variableinferior-octave-buffer and defaults to "*Inferior Octave*". From within this buffer,you can interact with the inferior Octave process ‘as usual’, i.e., by entering Octave commandsat the prompt. The buffer is in Inferior Octave mode, which is derived from thestandard Comint mode, a major mode for interacting with an inferior interpreter. See thedocumentation for comint-mode for more details, and use C-h b to find out about availablespecial keybindings.You can also communicate with an inferior Octave process from within files with Octavecode (i.e., buffers in Octave mode), using the following commands.C-c i lC-c i bC-c i fC-c i rC-c i sC-c i hSend the current line to the inferior Octave process (octave-send-line). Withpositive prefix argument N, send that many lines. If octave-send-line-autoforwardis non-nil, go to the next unsent code line.Send the current block to the inferior Octave process (octave-send-block).Send the current function to the inferior Octave process (octave-send-defun).Send the region to the inferior Octave process (octave-send-region).Make sure that ‘inferior-octave-buffer’ is displayed (octave-show-processbuffer).Delete all windows that display the inferior Octave buffer (octave-hideprocess-buffer).