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/*
Copyright © 2025 NAME HERE <EMAIL ADDRESS>
*/
package cmd
import (
"bytes"
"context"
"fmt"
"os"
"path/filepath"
"sync"
"github.com/scrotadamus/ghligh/document"
"github.com/spf13/cobra"
)
var recursive bool
type resolver struct {
paths []string
recurse bool
ctx context.Context
ch chan<- string
wg sync.WaitGroup
}
func (r *resolver) resolve() {
for _, path := range r.paths {
r.wg.Add(1)
go r.resolvePath(path)
}
go func() {
r.wg.Wait()
close(r.ch)
}()
}
func (r *resolver) resolvePath(path string) {
defer r.wg.Done()
if err := r.ctx.Err(); err != nil {
return
}
entries, err := os.ReadDir(path)
if err != nil {
str, err := filepath.Abs(path)
if err != nil {
return
}
r.ch <- str
return
}
for _, entry := range entries {
info, err := entry.Info()
if err != nil {
fmt.Fprintf(os.Stderr, "Error retrieving info for %s: %v\n", entry.Name(), err)
continue
}
fullPath := filepath.Join(path, entry.Name())
if info.IsDir() {
if r.recurse {
if err := r.ctx.Err(); err != nil {
return
}
r.wg.Add(1)
go r.resolvePath(fullPath)
}
} else if info.Mode().IsRegular() {
r.ch <- fullPath
}
}
}
// ArgsOrCWD returns the provided args slice if non-empty.
// If args is empty, it returns a slice containing the current working directory.
//
// Example:
//
// ArgsOrCWD([]string{"path1", "file2"}) -> []string{"path1", "file2"}
// ArgsOrCWD([]string{}) -> []string{"."}
func ArgsOrCWD(args []string) []string {
if len(args) == 0 {
cwd, err := os.Getwd()
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
return nil
}
return []string{cwd}
}
return args
}
// returns true if file specified in path start with the PDF magic header
func isPDF(path string) bool {
file, err := os.Open(path)
if err != nil {
// We only care about printing permissions errors
// and things like that
fmt.Fprintf(os.Stderr, "%s\n", err)
return false
}
defer file.Close()
header := make([]byte, 5)
_, err = file.Read(header)
if err != nil {
return false
}
return bytes.Equal(header, []byte("%PDF-"))
}
// returns true if file contains at least one highlight or is tagged with "ls" (is ls-able by ghligh)
func HasHighlights(path string) bool {
// Ensure is a pdf file, might block for other kind of files
if !isPDF(path) {
return false
}
doc, err := document.Open(path)
if err != nil {
return false
}
defer doc.Close()
return doc.HasHighlights()
}
// lsCmd represents the ls command
var lsCmd = &cobra.Command{
Use: "ls",
Short: "show files with highlights or tagged with 'ls' [unix]",
Long: `
ghligh ls file1.pdf directory [-R] [-c]
will show every file inside directory that contains highlights or it is marked
ls with the ghligh tag add command
ghligh ls # show files in current dir
ghligh ls file1.pdf # if it outpus file1.pdf it means that file1.pdf contains highlights
ghligh ls -c file1.pdf # same as ghligh ls file1.pdf but exit status will not be if file1.pdf doesnt
contains highlights
ghligh ls -R # do it recursively, be careful with symlink dir cycles, as I am to lazy to
address that particular issue
`,
Run: func(cmd *cobra.Command, args []string) {
files := ArgsOrCWD(args)
ch := make(chan string)
ctx := context.Background()
res := resolver{
paths: files,
recurse: recursive,
ctx: ctx,
ch: ch,
}
go res.resolve()
var wg sync.WaitGroup
var found bool
for file := range ch {
wg.Add(1)
go func(f string) {
defer wg.Done()
if HasHighlights(f) {
found = true
fmt.Printf("%s\n", f)
}
}(file)
}
wg.Wait()
check, err := cmd.Flags().GetBool("check")
if err != nil {
cmd.Help()
return
}
if check && !found {
os.Exit(1)
}
},
}
func init() {
rootCmd.AddCommand(lsCmd)
lsCmd.Flags().BoolVarP(&recursive, "recursive", "R", false, "List recursively")
lsCmd.Flags().BoolP("check", "c", false, "exit status is 1 if no file its found")
// order pdf by time of something (modification / creation) ???
//lsCmd.Flags().BoolP("time", "t", false, "ls by time")
}
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