// mxcover turns a -cover run into a coverage report.
//
// Usage:
//
//	mxcover <sites.json> <counts> [path-prefix]
//
// sites.json is the <output>.cover_sites.json the compiler writes beside a
// -cover build; counts is the file the instrumented program dumped into
// (MOXIE_COVER_OUT), whose lines look like "coversite 12 count=3". An optional
// path prefix limits the report to files under it, which is how a relay build
// reports on its own tree while the runtime and stdlib are compiled in too.
//
// The join itself lives in pkg/mxcover, so `moxie test -cover` can print the
// same report for the package it just ran without shelling out to this tool.
package main

import (
	"fmt"
	"os"

	"git.smesh.lol/moxie/pkg/mxcover"
)

func main() {
	args := os.Args
	if len(args) < 3 {
		fmt.Println("usage: mxcover <sites.json> <counts> [path-prefix]")
		os.Exit(2)
	}
	prefix := ""
	if len(args) > 3 {
		prefix = args[3]
	}
	out, errText := mxcover.Report(args[1], args[2], prefix)
	if errText != "" {
		fmt.Println("mxcover: " | errText)
		os.Exit(1)
	}
	fmt.Print(out)
}