Gri Extras
1: Introduction
2: Simple example
3: Fancy example
4: Running Gri
5: Programming Gri
6: General Issues
7: X-Y Plots
8: Contour Plots
9: Image Plots
10: Examples
11: Handling Data
12: Gri Commands
13: Gri Extras
14: Evolution of Gri
15: Installing Gri
16: Gri Bugs
17: System Tools
18: Acknowledgments
19: License
20: Newsgroup
21: Concept Index
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13: Extra things provided with Gri
13.1: Indentation program
A Perl program called `grindent ' is provided with Gri, installed in
the same directory as Gri.
`ftp://ftp.phys.ocean.dal.ca/users/kelley/gri'
<P>
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Grindent ' can work as a filter, transforming standard input into
standard output, as in `cat a.gri | grindent '. On a Sun
openwindows system, you can therefore make the textedit tool do gri
indentation on the contents of the window by adding the following line
to your `~/.text_extras_menu' file:
"Pretty-print Gri" /local/bin/grindent
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`
Grindent ' can work on a specified Gri command file inplace, as in
`grindent cmd.gri '. Before modifying the `cmd.gri' file, it
first makes a copy in `cmd.gri.BAK'.
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`
Grindent ' indents code within `if ' blocks, `while '
blocks, and new commands. The indentation level is 4 spaces by default.
The `-i ' commandline option lets you change this, e.g.,
`grindent -i2 cmd.gri ' specifies 2 spaces.
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`
Grindent ' tries to line up right-trailing inline comments and continuation
backslashes, to a default column of 32. The commandline option
`-c ' lets you change this column, e.g. `grindent -c40 cmd.gri '
specifies the 40th column.
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Grindent ' makes assignment statements have precisely 1 space before and after
the equal sign.
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Grindent ' transforms all TAB characters into single spaces.
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Grindent ' leaves the help for new commands unaltered.
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Grindent ' does some simple syntax checking, for things like unclosed `if '
statements within `while ' loops or within the whole program. When
Grindent gives a warning, you will know that either the line it quotes
is wrong or some line above it; use the indentation to track the error
down.
13.2: gri_merge, combine PostScript files into one page
Merge separate PostScript files, created by Gri, into one page.
13.3: gri_unpage, create multiple PostScript files for multipage input
Given a multipage PostScript file, `gri_unpage ' creates several new
PostScript files, one for each page.
13.4: gri_curve, extract data from Gri PostScript file
`gri_curve ' is a Perl script that extract information from
PostScript files, in user units. It is mostly used by the author; see
comments in the script.
13.5: Updating Program
A perlscript called `gri_update ' is provided with Gri.
This perlscript edits Gri command files, translating old syntax into new
syntax. The editing is done in-place, after copying to a file with
suffix `.BAK'. `gri_update ' cannot handle all
incompatibilities but it will translate the things
illustrated in the following before/after comparison
see History.
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`
{rpn width("hello")} ' -> `{rpn "hello" width} '
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{rpn ascent("hello")} ' -> `{rpn "hello" ascent} '
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{rpn descent("hello")} ' -> `{rpn "hello" descent} '
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convert columns to grid planar '
-> `convert columns to grid boxcar '
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