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72 lines
2.7 KiB
Bash
72 lines
2.7 KiB
Bash
#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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# args: ../pytools/tests/data/test.json
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#
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# Author: Hari Sekhon
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# Date: 2020-08-18 01:34:41 +0100 (Tue, 18 Aug 2020)
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#
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# https://github.com/harisekhon/bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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#
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# https://www.linkedin.com/in/harisekhon
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#
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set -euo pipefail
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[ -n "${DEBUG:-}" ] && set -x
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srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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# shellcheck disable=SC1090
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. "$srcdir/lib/utils.sh"
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# shellcheck disable=SC2034,SC2154
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usage_description="
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Converts JSON to YAML using either Perl, Ruby or Python (whichever is available in that order)
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JSON can be specified as a filename argument to piped to standard input
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"
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# used by usage() in lib/utils.sh
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# shellcheck disable=SC2034
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usage_args="[<filename>]"
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help_usage "$@"
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json2yaml(){
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# needs 3rd party modules installed (YAML::XS, JSON::XS), so check we have both modules first
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if type -P perl &>/dev/null &&
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perl -MYAML::XS=Load -MJSON::XS=encode_json -e '' &>/dev/null; then
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#perl -MYAML::XS=LoadFile -MJSON::XS=encode_json -e 'for (@ARGV) { for (LoadFile($_)) { print encode_json($_),"\n" } }'
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perl -MYAML::XS=Dump -MJSON::XS=decode_json -e '$/ = undef; print Dump(decode_json(<STDIN>)) . "\n"'
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# untested, so many transitive dependencies, a couple fail to build
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#elif type -P catmandu &>/dev/null; then
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# catmandu convert JSON to YAML
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elif type -P ruby &>/dev/null &&
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ruby -r yaml -r json -e '' &>/dev/null; then
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# don't want variable expansion
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# shellcheck disable=SC2016
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ruby -r yaml -r json -e 'puts YAML.dump(JSON.parse(STDIN.read))'
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# moved to last as typical Python version change problems, breaks across environments with AttributeError: 'module' object has no attribute 'FullLoader'
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# yaml is a 3rd party library, and in old 2.x versions so was json - only run the Python conversion if we have both libraries installed
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elif type -P python &>/dev/null &&
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python -c 'import yaml, json' &>/dev/null; then
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python -c 'import sys, yaml, json; yaml.safe_dump(json.load(sys.stdin), sys.stdout, default_flow_style=False)'
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# don't use yq - there are 2 completely different 'yq' which could appear in \$PATH, so this is unreliable
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#elif type -P yq &>/dev/null; then
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else
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die "ERROR: unable to convert yaml to json since not one of the following tools were found: Perl (YAML::XS + JSON::XS), Ruby (json + yaml) or Python (PyYaml)"
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fi
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}
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if [ $# -gt 0 ]; then
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for arg; do
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json2yaml < "$arg"
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echo
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done
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else
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json2yaml
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echo
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fi
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