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  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

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12.4.5: Editing the syntax output by gri-complete

You might wonder what to do with all the bracketed code left behind by `gri-complete'. It certainly won't go through the gri parser without error, so you have to edit it out. The tools provided in gri-mode are `gri-option-select' (`C-C C-o') and `gri-kill-option' (`C-C C-k') to narrow in on a particular gri command, given a syntax description left on the line by `gri-complete'. The cursor location is used to decide which gri command(s) to narrow to.

For example, if `gri-complete' is used on the line `dr x a', the result will be a line like

draw x axis [at bottom|top|{.y. [cm]} [lower|upper]]

This is the gri way of describing many commands at once. The above syntax description is a shortcut formulation for all of:

draw x axis
draw x axis at bottom
draw x axis at bottom top
draw x axis at bottom bottom
draw x axis at top
draw x axis at top top
draw x axis at top bottom
draw x axis at .y. cm
draw x axis at .y. cm lower
draw x axis at .y. cm upper

The `gri-option-select' (`C-C C-o') command provides easy navigation to select one of these commands. The narrowing process is governed by the cursor position. For example, to get the command narrowed down to

draw x axis at bottom [lower|upper]

place the cursor somewhere in the word `bottom' and invoke `gri-option-select'. To complete the narrowing process, selecting

draw x axis at bottom lower

move the cursor to some place in the word `lower' and invoke `gri-option-select again'. On the other hand, to get

draw x axis at bottom

you would have put the cursor over either the word `lower' or `upper', and invoke `gri-kill-option' (`C-C C-k') instead.

You might want to practice using this example to learn how to do it. If you make a mistake, note that the normal Emacs undo works.

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