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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
}
// TabsToMap read from a reader and turns values from kCol, vCol columns into a
// mapping.
func TabsToMap(r io.Reader, sep string, kCol, vCol int) (map[string]string, error) {
var (
br = bufio.NewReader(r)
m = make(map[string]string)
)
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 && len(fields) <= vCol {
k := strings.TrimSpace(fields[kCol-1])
v := strings.TrimSpace(fields[vCol-1])
m[k] = v
} else {
return nil, fmt.Errorf("invalid line: %v", line)
}
}
return m, nil
}
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