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GeezerVison is showing github.com — gf/main.go at master · tomnomnom/gf

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package main
import (
"encoding/json"
"errors"
"flag"
"fmt"
"os"
"os/exec"
"os/user"
"path/filepath"
"strings"
)
type pattern struct {
Flags string `json:"flags,omitempty"`
Pattern string `json:"pattern,omitempty"`
Patterns []string `json:"patterns,omitempty"`
Engine string `json:"engine,omitempty"`
}
func main() {
var saveMode bool
flag.BoolVar(&saveMode, "save", false, "save a pattern (e.g: gf -save pat-name -Hnri 'search-pattern')")
var listMode bool
flag.BoolVar(&listMode, "list", false, "list available patterns")
var dumpMode bool
flag.BoolVar(&dumpMode, "dump", false, "prints the grep command rather than executing it")
flag.Parse()
if listMode {
pats, err := getPatterns()
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
return
}
fmt.Println(strings.Join(pats, "\n"))
return
}
if saveMode {
name := flag.Arg(0)
flags := flag.Arg(1)
pattern := flag.Arg(2)
err := savePattern(name, flags, pattern)
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
}
return
}
patName := flag.Arg(0)
files := flag.Arg(1)
if files == "" {
files = "."
}
patDir, err := getPatternDir()
if err != nil {
fmt.Fprintln(os.Stderr, "unable to open user's pattern directory")
return
}
filename := filepath.Join(patDir, patName+".json")
f, err := os.Open(filename)
if err != nil {
fmt.Fprintln(os.Stderr, "no such pattern")
return
}
defer f.Close()
pat := pattern{}
dec := json.NewDecoder(f)
err = dec.Decode(&pat)
if err != nil {
fmt.Fprintf(os.Stderr, "pattern file '%s' is malformed: %s\n", filename, err)
return
}
if pat.Pattern == "" {
// check for multiple patterns
if len(pat.Patterns) == 0 {
fmt.Fprintf(os.Stderr, "pattern file '%s' contains no pattern(s)\n", filename)
return
}
pat.Pattern = "(" + strings.Join(pat.Patterns, "|") + ")"
}
if dumpMode {
fmt.Printf("grep %v %q %v\n", pat.Flags, pat.Pattern, files)
} else {
var cmd *exec.Cmd
operator := "grep"
if pat.Engine != "" {
operator = pat.Engine
}
if stdinIsPipe() {
cmd = exec.Command(operator, pat.Flags, pat.Pattern)
} else {
cmd = exec.Command(operator, pat.Flags, pat.Pattern, files)
}
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Run()
}
}
func getPatternDir() (string, error) {
usr, err := user.Current()
if err != nil {
return "", err
}
path := filepath.Join(usr.HomeDir, ".config/gf")
if _, err := os.Stat(path); !os.IsNotExist(err) {
// .config/gf exists
return path, nil
}
return filepath.Join(usr.HomeDir, ".gf"), nil
}
func savePattern(name, flags, pat string) error {
if name == "" {
return errors.New("name cannot be empty")
}
if pat == "" {
return errors.New("pattern cannot be empty")
}
p := &pattern{
Flags: flags,
Pattern: pat,
}
patDir, err := getPatternDir()
if err != nil {
return fmt.Errorf("failed to determine pattern directory: %s", err)
}
path := filepath.Join(patDir, name+".json")
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
if err != nil {
return fmt.Errorf("failed to create pattern file: %s", err)
}
defer f.Close()
enc := json.NewEncoder(f)
enc.SetIndent("", " ")
err = enc.Encode(p)
if err != nil {
return fmt.Errorf("failed to write pattern file: %s", err)
}
return nil
}
func getPatterns() ([]string, error) {
out := []string{}
patDir, err := getPatternDir()
if err != nil {
return out, fmt.Errorf("failed to determine pattern directory: %s", err)
}
_ = patDir
files, err := filepath.Glob(patDir + "/*.json")
if err != nil {
return out, err
}
for _, f := range files {
f = f[len(patDir)+1 : len(f)-5]
out = append(out, f)
}
return out, nil
}
func stdinIsPipe() bool {
stat, _ := os.Stdin.Stat()
return (stat.Mode() & os.ModeCharDevice) == 0
}
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