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package xio
import (
"bufio"
"fmt"
"io"
"os"
"strings"
)
// OpenTwo opens two files. The caller needs to check for a single error only.
func OpenTwo(f1, f2 string) (g1, g2 *os.File, err error) {
if g1, err = os.Open(f1); err != nil {
return nil, nil, err
}
if g2, err = os.Open(f2); err != nil {
return nil, nil, err
}
return g1, g2, nil
}
// TabsToMapFile turns two columns from a tabular file into a map.
func TabsToMapFile(filename, sep string, kCol, vCol int) (map[string]string, error) {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
return TabsToMap(f, sep, kCol, vCol)
}
// TabsToMap read from a reader and turns values from kCol, vCol columns
// (1-indexed) into a map.
func TabsToMap(r io.Reader, sep string, kCol, vCol int) (map[string]string, error) {
var (
br = bufio.NewReader(r)
m = make(map[string]string)
line, k, v string
fields []string
err error
)
for {
line, err = br.ReadString('\n')
if err == io.EOF {
return m, nil
}
if err != nil {
return nil, err
}
fields = strings.Split(line, sep)
if len(fields) > kCol-1 && len(fields) > vCol-1 {
k = strings.TrimSpace(fields[kCol-1])
v = strings.TrimSpace(fields[vCol-1])
m[k] = v
} else {
return nil, fmt.Errorf("invalid line: %v (%v fields, %v, %v)", line, len(fields), kCol, vCol)
}
}
return m, nil
}
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