feat: add --json flag

[Nadim147c]

The --json flag allows to output version as json.

{
  "major": 3,
  "minor": 2,
  "patch": 4,
  "metadata": "",
  "prefix": "v",
  "prerelease": "",
  "version": "v3.2.4"
}

Why?

It gives more control of over version. My reason for adding this flag is adding prerelease automatically using shell script. Something like this:

#!/usr/bin/env bash

prerelease=$(svu current --json | jq .prerelease --raw-output)
prerelease=$(echo "$prerelease" |
    gum input --header "Pre release tag" --placeholder "alpha, beta or rc")

if [ -n "$prerelease" ]; then
    svu next --prerelease "$prerelease"
    exit
fi

# Also probably create the tag?
svu next

It can be done with grep but it much nicer and reliable. Thanks!

[caarlos0]

i think it is probably clearer to have a type here instead of a map

also adds the benefit that people that want to parse it can just copy the struct from here.

[Nadim147c]

does this works?

type VersionInfo struct {
	Version    string `json:"version"`
	Major      uint64 `json:"major"`
	Minor      uint64 `json:"minor"`
	Patch      uint64 `json:"patch"`
	Prefix     string `json:"prefix,omitempty"`
	Metadata   string `json:"metadata,omitempty"`
	Prerelease string `json:"prerelease,omitempty"`
	Build      string `json:"build,omitempty"`
}

[caarlos0]

that looks great, thank you!