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|
phrollo: a phlogroll in a shellscript
=============================================
`phrollo` is a simple tool to manage a phlog roll. It uses a simple
configuration file and outputs the relevant selectors to be added to a
gophermap. The list of selectors of updated phlogs is sorted in
decreasing order of update time (meaning that more recent updates appear
at the top of the list). `phrollo` also prints on stderr an updaterd
config file, to be used for future calls.
`phrollo` detects updates by using `shasum -a 256`, i.e. by computing
a hash of the resource and comparing it with the hash obtained when the
resource was last seen.
Usage
===========
Either :
```
./phrollo status.txt
```
or:
```
cat status.txt | ./phrollo
```
will print the sorted list of gopher selectors on stdout, and the
updated config file on stderr.
IMPORTANT: The next time `phrollo` is run, it must be given the last
config file generated, so be sure to redirect stderr appropriately. A
fully working example is given below.
Configuration file
========================
The format of the `phrollo` config file is as follows:
DATE \t DESCRIPTION \t URI \t HOST \t PORT \t SHASUM
where:
- DATE: is the last time the phlog was updated, or an empty string for
a new phlog;
- DESCRIPTION: is the description of the phlog (e.g., the name of the
author)
- URI: is the path of the phlog
- HOST: well, the host
- PORT: normally 70
- SHASUM: the shasum of the phlog at the time of the latest change, or
an empty string for a new phlog
Example
=============
Let us construct an initial `phrollo` config file containing all the
phlogs we would like to follow. Since `phrollo` has never seen any of
those phlogs, both DATE and SHASUM will be ignored. We will indicated
them with a "-" dash. Notice that fields are separated by actual TABs:
```
- Slugmax /~slugmax/cgi-bin/slerm zaibatsu.circumlunar.space 70 -
- RPDO /Phlog 1436.ninja 70 -
- Alex Shroeder / alexschroeder.ch 70 -
- Solderpunk /~solderpunk/phlog zaibatsu.circumlunar.space 70 -
- Tomasino /phlog gopher.black 70 -
- KatolaZ /~katolaz/phlog republic.circumlunar.space 70 -
```
Now we can feed this file to `phrollo`:
```
cat config.txt | ./phrollo 2> config_updated.txt > gophermap
```
and we will get the following output in `gophermap`:
```
1(20190126) Alex Shroeder / alexschroeder.ch 70
1(20190126) KatolaZ /~katolaz/phlog republic.circumlunar.space 70
1(20190126) RPDO /Phlog 1436.ninja 70
1(20190126) Slugmax /~slugmax/cgi-bin/slerm zaibatsu.circumlunar.space 70
1(20190126) Solderpunk /~solderpunk/phlog zaibatsu.circumlunar.space 70
1(20190126) Tomasino /phlog gopher.black 70
```
which is a list of selectors corresponding to the phlogs specified in
the config file, and the updated config file in config_updated.txt:
```
20190126 Tomasino /phlog gopher.black 70 bd141abfc29522e3e2b5d00f1a656212201ae5def60de90a7ce847cddeb6d0db
20190126 Solderpunk /~solderpunk/phlog zaibatsu.circumlunar.space 70 4df8feff5237db12a4fb1c43d95f254dc26b0e35e3b008d53cc5004ad2c6acb9
20190126 Slugmax /~slugmax/cgi-bin/slerm zaibatsu.circumlunar.space 70 bfd0e14e2c5b08fff6b968804dd253e488c5e0bfd9d80cec4ca7599928fac53f
20190126 RPDO /Phlog 1436.ninja 70 d61e34dfc71a10f5b45c6ccf7f6d96e4f976832efdd179e71a0981695b317dc9
20190126 KatolaZ /~katolaz/phlog republic.circumlunar.space 70 af9b99199b344b027addeb09ba71621123bf799605b6190a65be145221bcefde
20190126 Alex Shroeder / alexschroeder.ch 70 36d66161d096c5c729a6433c411fad9da978931cdfab40e9bd57787aa0e0b1f6
```
Then, we can run `phrollo` again using the latest updated config file
to detect updates and generate the new gophermap. It is possible to
automate the update procedure by something like:
```
#!/bin/sh
cp config.txt config.txt."$(date +%Y%m%d)"
cat config.txt | ./phrollo 2> config.txt.new > gophermap.new
[ $? -eq 0 ] && {
mv config.txt.new config.txt
mv gophermap.new gophermap
}
```
|
