/
command_show.go
68 lines (56 loc) · 1.26 KB
/
command_show.go
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package main
import (
"errors"
"flag"
"fmt"
"os"
"os/exec"
)
type ShowCommand struct {
flag *flag.FlagSet
}
func (c *ShowCommand) Name() string {
return "show"
}
func (c *ShowCommand) Description() string {
return "Open notes with $PAGER"
}
func (c *ShowCommand) setup(args []string, _options *Options) {
c.flag = flag.NewFlagSet(c.Name(), flag.ExitOnError)
c.flag.Usage = func() {
output := c.flag.Output()
fmt.Fprintf(output, "Usage: %s %s <name>...\n", os.Args[0], c.Name())
fmt.Fprintf(output, "\n%s.\n", c.Description())
}
c.flag.Parse(args)
}
func (c *ShowCommand) Run(args []string, options *Options) error {
c.setup(args, options)
dir, err := options.CheckDirectory()
if err != nil {
return err
}
if c.flag.NArg() == 0 {
return ErrNoFileName
}
return c.runPager(dir, c.flag.Args())
}
func (c *ShowCommand) runPager(dir *Directory, names []string) error {
pager, ok := os.LookupEnv("PAGER")
if !ok {
return errors.New("PAGER is not set")
}
var args []string
for _, name := range names {
path, err := dir.JoinPath(name)
if err != nil {
return err
}
args = append(args, path)
}
pagerCmd := exec.Command(pager, args...)
pagerCmd.Stdin = os.Stdin
pagerCmd.Stdout = os.Stdout
pagerCmd.Stderr = os.Stderr
return pagerCmd.Run()
}