October 2024
Intermediate to advanced
272 pages
6h 54m
English
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Diverting Output and Including Files
You’re already familiar with the divert([N]) macro, but its concept may still be unclear.
Recall that most m4 scripts act as filters that stream data from the standard input to the standard output (first mentioned). Like a natural water stream, a data stream can be temporarily diverted and later restored. The divert([N]) macro handles this data stream diversion.
By calling divert(N), you request m4 to stream the data from the standard input to a temporary storage unit, known as a diversion, numbered N. A diversion can be implemented as a RAM buffer or a file, depending on how much data it needs to hold. The divert(-1) macro discards the output, which is why it was used in previous code examples. The
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