69 lines
1.8 KiB
Bash
Executable File
69 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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#
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# Hash cache storage and retrieval operations
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#
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# Copyright (C) 2012 Mike Gerwitz
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#
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# This file is part of repo2html.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# #
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# intended to be configured from a configuration file; lowercase to help
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# mitigate global env var conflicts
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cachefile="${hashcache:-.hashcache}"
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# 'cause it rhymes and 'cause it's useful
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_cache()
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{
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hash="$1"
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value="$2"
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echo "$hash $value" >>"$cachefile"
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}
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# retrieves the value associated with the given hash
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_retrieve()
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{
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hash="$1"
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# if multiple identical hashes exist, then the last one takes precedence
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# (ideally, such a thing should never happen, but it's best to be prepared)
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grep "^$hash " "$cachefile" \
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| tail -n1 \
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| cut -d' ' -f2-
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}
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# clears the cache file
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_wipe()
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{
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>"$cachefile"
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}
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# the hash is required, but the value to set it to is optional
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hash="${1?No hash provided}"
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set="$2"
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# poor man's argument parsing (we don't need no stinkin' options [yet]); "clear"
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# is not a valid hash currently, though I suppose a sadistic repository could
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# allow such, and we're supposed to be repo-agnostic
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if [ "$hash" == 'clear' ]; then
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_wipe
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elif [ "$set" ]; then
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_cache "$hash" "$set"
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else
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_retrieve "$hash"
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fi
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