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74 lines
1.3 KiB
Go

// Copyright 2022 wanderer <wanderer at dotya.ml>
// SPDX-License-Identifier: GPL-3.0-or-later
package main
import (
"encoding/csv"
"flag"
"fmt"
"log"
"os"
)
const (
mFlagDescr = "path to a CSV file containing matrix values"
aFlagDescr = "read matrix from stdin-provided arg"
usage = `Usage of diwt:
-m, --matrixfile ` + mFlagDescr + `
-a, --stdin ` + aFlagDescr + `
-h, --help prints help information
`
)
var version = "development"
func main() {
log.Println("starting diwt, version", version)
var f string
var a string
flag.StringVar(&f, "matrixfile", "", mFlagDescr)
flag.StringVar(&f, "m", "", mFlagDescr)
flag.StringVar(&a, "stdin", "", aFlagDescr)
flag.StringVar(&a, "a", "", aFlagDescr)
flag.Usage = func() { fmt.Fprint(os.Stderr, usage) }
flag.Parse()
var r csv.Reader
switch {
case f == "" && a == "":
log.Println("no file provided, bailing...")
os.Exit(3)
case a != "" && f != "":
log.Println(
"only provide one of the flags (file or stdin), not both. " +
"exiting.",
)
os.Exit(4)
case f != "":
r = readFile(f)
case a != "":
r = readArg(a)
}
records, err := r.ReadAll()
if err != nil {
log.Fatalln("error reading records:", err)
}
m := convertMatrix(records)
traverseMatrixMinSumPath(m)
log.Println("looks like we're done here.")
}