Siag has support for these file formats:
- Native Siag format, with support for Scheme and C-style
expressions as well as formatting attributes (fonts,
widths and so on). Very nice for Siag documents, but
totally incompatible with anything else.
- Comma Separated Values
- Almost every spreadsheet can
load and save this format, but all expressions are
lost. Despite its name, any character can be used
as field separator.
- Plain Text
- Every line is loaded as a label and placed in column 1
of successive rows.
- Lotus 1-2-3
- Siag imports documents in Lotus Worksheet format and
can save values in the same format.
- Siag can output pretty decent Postscript code, with
DSC comments and all to make the resulting files
post-processable. Normally, this code goes straight
to the printer or to Ghostview for previewing, but
it can also be saved in a file. Siag cannot load
- HTML Tables
- Hypertext Markup Language as featured on the World Wide Web.
A spreadsheet maps nicely to the HTML table format,
and Siag can save and load (well-behaved) documents
in this format.
- Scheme Code
- Files containing Scheme code can be loaded and evaluated.
- Troff Tables
- Tables which can be processed by tbl to produce input
to the troff document formatting system.
- LaTeX Tables
- Tables which can be included in documents using the
LaTeX typesetting package.
- Very incomplete support for MS Excel (loading only).
This requires the xls2csv utility which is not
part of Siag.
A better way to convert Excel files to Siag is to save them
as Lotus worksheets (see below) in Excel and then load
them in Siag.
- Siag can save in Adobe's "Portable Document Format".
Requires the program ps2pdf.
Adding Format Handlers
Siag can use external converters to convert files from formats it
can't handle directly to ones it does handle. The converters are registered
by the function register-converters; see siag.scm for the default
implementation of that function.
Ulric Eriksson - June 1999 - email@example.com