Tag: jq

Nice idea for my git log visualiser

I could use this excellent idea in my Git log visualiser. Never thought I could do this! ?

Currently I am parsing plain text output from git log –numstat command, looking at certain order of lines and line beginnings to determine what is on the line.

Exporting from git log to JSON using jq like Simon does in his post would make parsing extremely simple using Swift Codable.

Posting this here to remind myself.

Merging two JSON files

Having two large JSON files with one common element, how can you merge them? Editing by hand not so nice if the files contain hundreds of elements.

For example, you have a large JSON file of locations:

{ "name": "Oulu", "lat": 65.013784817, "lon": 25.47209907 },

And then you also have a large JSON file of location codes for the commune:

{ "name": "Oulu", "code": "564" },

And you would like to merge these into a one JSON file and parse the commune code, name, and location data at one go.

You can do this with jq using the following command:

./jq-osx-amd64 --slurpfile file2 codes.json.txt ' INDEX($file2[]; .name) as $dict | $dict[.name] as $x | if $x then . + $x else empty end ' coords.json.txt > out.json

And as a result, you get your JSON element merged in one file:

{ "name": "Oulu", "lat": 65.013784817, "lon": 25.47209907, "code": "564" },

Much faster than copying and pasting or implementing your own JSON merger.