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package main
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"sync"
"unicode/utf8"
)
// returns truncated 'data' and amount of bytes skipped (for cursor pos adjustment)
func filter_out_shebang(data []byte) ([]byte, int) {
if len(data) > 2 && data[0] == '#' && data[1] == '!' {
newline := bytes.Index(data, []byte("\n"))
if newline != -1 && len(data) > newline+1 {
return data[newline+1:], newline + 1
}
}
return data, 0
}
func file_exists(filename string) bool {
_, err := os.Stat(filename)
if err != nil {
return false
}
return true
}
func char_to_byte_offset(s []byte, offset_c int) (offset_b int) {
for offset_b = 0; offset_c > 0 && offset_b < len(s); offset_b++ {
if utf8.RuneStart(s[offset_b]) {
offset_c--
}
}
return offset_b
}
func xdg_home_dir() string {
xdghome := os.Getenv("XDG_CONFIG_HOME")
if xdghome == "" {
xdghome = filepath.Join(os.Getenv("HOME"), ".config")
}
return xdghome
}
//-------------------------------------------------------------------------
// print_backtrace
//
// a nicer backtrace printer than the default one
//-------------------------------------------------------------------------
var g_backtrace_mutex sync.Mutex
func print_backtrace(err interface{}) {
g_backtrace_mutex.Lock()
defer g_backtrace_mutex.Unlock()
fmt.Printf("panic: %v\n", err)
i := 2
for {
pc, file, line, ok := runtime.Caller(i)
if !ok {
break
}
f := runtime.FuncForPC(pc)
fmt.Printf("%d(%s): %s:%d\n", i-1, f.Name(), file, line)
i++
}
fmt.Println("")
}
//-------------------------------------------------------------------------
// File reader goroutine
//
// It's a bad idea to block multiple goroutines on file I/O. Creates many
// threads which fight for HDD. Therefore only single goroutine should read HDD
// at the same time.
// -------------------------------------------------------------------------
type file_read_request struct {
filename string
out chan file_read_response
}
type file_read_response struct {
data []byte
error error
}
type file_reader_type struct {
in chan file_read_request
}
func new_file_reader() *file_reader_type {
this := new(file_reader_type)
this.in = make(chan file_read_request)
go func() {
var rsp file_read_response
for {
req := <-this.in
rsp.data, rsp.error = ioutil.ReadFile(req.filename)
req.out <- rsp
}
}()
return this
}
func (this *file_reader_type) read_file(filename string) ([]byte, error) {
req := file_read_request{
filename,
make(chan file_read_response),
}
this.in <- req
rsp := <-req.out
return rsp.data, rsp.error
}
var file_reader = new_file_reader()
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