Chapters: 1: Introduction 2: Simple example 3: Invocation 4: Finer Control 5: X-Y Plots 6: Contour Plots 7: Image Plots 8: Examples 9: Gri Commands 10: Programming 11: Environment 12: Emacs Mode 13: History 14: Installation 15: Gri Bugs 16: Test Suite 17: Gri in Press 18: Acknowledgments 19: License Indices: Concepts Commands Variables | ## 12.1: About Gri Mode Gri mode has all the wonderful things you've come to expect from Emacs modes. Here's a brief overview of the features: It can complete partially typed commands, builtin variables and synonyms (``gri-complete`', ``M-Tab`') and help you edit the syntax that was thus inserted for you (``gri-option-select`', ``C-c C-o`'; ``gri-option-kill`', ``C-c C-k`'). It can provide a short help synopsis concerning the command on the current line (``gri-help-this-command`', ``C-c C-h`'), or load the info manual for that command (``gri-info-this-command`', ``C-c C-i`'). It knows the list of all Gri commands, and can provide help or info regarding any of them (``gri-help`', ``C-c M-h`'; ``gri-info`', ``C-c M-i`') using command name completion at the prompt (``Tab`'). All Gri commands are listed in a pull-down menu from the menubar, which you can use to either enter the text of the selected command, or obtain help or info about it. It can help you find an unknown command by listing all containing a given word (``gri-apropos`', ``C-c C-a`'). It fontifies your Gri code using colour coding. It indents if statements, loops, and so on (``gri-indent-line`', ``Tab`'). It can let you run Gri and view its output without leaving the editor (``gri-run`', ``C-c C-r`'). If an error is encountered, Emacs will rearrange the buffer so the cursor is on the bad line of the Gri command-file. If you've already run Gri, and therefore have a PostScript output file, the mode will let you view that file (``gri-view`', ``C-c C-v`') even if that file is compressed. Thus one never has to leave Emacs; type ``C-c C-r`' to run Gri, and if there is no error, the graph comes up automatically. If there was an error, gri-mode will move editing point to the line with the error and display the error message. Given that the mode can complete partially typed commands, this means a substantial saving in development time. Inside gri-mode, type ``C-h m`' for help on the mode, including a list of all commands and key definitions.