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30 lines
1.0 KiB
30 lines
1.0 KiB
6 years ago
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## Burrow-The-Burrows
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A Gopher burrower in a shell script. By using `burrow` and a bit of
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plumbing you can get all the links in a Gopher MENU, recursively visit
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all the available subdirs, and create a directed graph of the visited
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selectors.
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`burrow` takes as input a gopher identifier, as generated by
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`url_to_id`, which is considered a gophermap, and provides on stdout the
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list of menu selectors found in that document. `burrow` will also dump
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on stderr the list of all the edges (to any kind of selector) found in
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that page, in the format:
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src_SHA256 dst_SHA256
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where `src_SHA256` is the SHA256 of the source selector (the current
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document), while `dst_SHA256` is the destination selector (the pointed
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document).
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To start a crawl, one can do something like:
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```
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$ ./url_to_id gopher://your.gopher.url/ > ids
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$ tail -f ids | parallel -j2 './burrow {}' 2>> graph.txt | tee -a ids >/dev/null &
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```
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Notice that `burrow` will create a certain number of folders in the
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current directory, used to keep track of the selectors that have been
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already retrieved.
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