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@wader
Created August 29, 2023 14:06
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json diff with jq
# Usage:
# jq -n -L . 'include "diff"; diff({hello:1}; {hello:2, world: 3})'
# {
# "hello": {
# "a": 1,
# "b": 2
# },
# "world": {
# "b": 3
# }
# }
#
# produce a/b pairs for diffing values
def diff($a; $b):
( ( $a | type) as $at
| ( $b | type) as $bt
| if $at != $bt then {a: $a, b: $b}
elif ($at == "array" or $at == "object") then
( [ ((($a | keys) + ($b | keys)) | unique)[] as $k
| {
($k | tostring):
( [($a | has($k)), ($b | has($k))]
| if . == [true, true] then diff($a[$k]; $b[$k])
elif . == [true, false] then {a: $a[$k]}
elif . == [false, true] then {b: $b[$k]}
else empty # TODO: can't happen? error?
end
)
}
]
| add
| if . == null then empty end
)
else
if $a == $b then empty else {a: $a, b: $b} end
end
);
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