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util.go
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util.go
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package main
import (
"fmt"
"image"
"path/filepath"
"strings"
"sync"
"github.com/rjkroege/edwood/file"
"github.com/rjkroege/edwood/runes"
"github.com/rjkroege/edwood/util"
)
var (
prevmouse image.Point
mousew *Window
)
func clearmouse() {
mousew = nil
}
func savemouse(w *Window) {
prevmouse = mouse.Point
mousew = w
}
func restoremouse(w *Window) bool {
defer func() { mousew = nil }()
if mousew != nil && mousew == w {
w.display.MoveTo(prevmouse)
return true
}
return false
}
func bytetorune(s []byte) []rune {
r, _, _ := util.Cvttorunes(s, len(s))
return r
}
// TODO(flux) The "correct" answer here is return unicode.IsNumber(c) || unicode.IsLetter(c)
func isalnum(c rune) bool {
// Hard to get absolutely right. Use what we know about ASCII
// and assume anything above the Latin control characters is
// potentially an alphanumeric.
if c <= ' ' {
return false
}
if 0x7F <= c && c <= 0xA0 {
return false
}
if strings.ContainsRune("!\"#$%&'()*+,-./:;<=>?@[\\]^`{|}~", c) {
return false
}
return true
}
func errorwin1Name(dir string) string {
return filepath.Join(dir, "+Errors")
}
func errorwin1(dir string, incl []string) *Window {
r := errorwin1Name(dir)
w := lookfile(r)
if w == nil {
if len(row.col) == 0 {
if row.Add(nil, -1) == nil {
util.AcmeError("can't create column to make error window", nil)
}
}
w = row.col[len(row.col)-1].Add(nil, nil, -1)
w.filemenu = false
w.SetName(r)
xfidlog(w, "new")
}
for _, in := range incl {
w.AddIncl(in)
}
w.autoindent = *globalAutoIndent
return w
}
// make new window, if necessary; return with it locked
func errorwin(md *MntDir, owner int) *Window {
var w *Window
for {
if md == nil {
w = errorwin1("", nil)
} else {
w = errorwin1(md.dir, md.incl)
}
w.Lock(owner)
if w.col != nil {
break
}
// window was deleted too fast
w.Unlock()
}
return w
}
// Incoming window should be locked.
// It will be unlocked and returned window
// will be locked in its place.
func errorwinforwin(w *Window) *Window {
var (
owner int
incl []string
t *Text
)
t = &w.body
dir := t.DirName("")
incl = append(incl, w.incl...)
owner = w.owner
w.Unlock()
for {
w = errorwin1(dir, incl)
w.Lock(owner)
if w.col != nil {
break
}
// window deleted too fast
w.Unlock()
}
return w
}
// Heuristic city.
func makenewwindow(t *Text) *Window {
var (
c *Column
w, bigw, emptyw *Window
emptyb *Text
i, y, el int
)
switch {
case activecol != nil:
c = activecol
case seltext != nil && seltext.col != nil:
c = seltext.col
case t != nil && t.col != nil:
c = t.col
default:
if len(row.col) == 0 && row.Add(nil, -1) == nil {
util.AcmeError("can't make column", nil)
}
c = row.col[len(row.col)-1]
}
activecol = c
if t == nil || t.w == nil || len(c.w) == 0 {
return c.Add(nil, nil, -1)
}
// find biggest window and biggest blank spot
emptyw = c.w[0]
bigw = emptyw
for i = 1; i < len(c.w); i++ {
w = c.w[i]
// use >= to choose one near bottom of screen
if w.body.fr.GetFrameFillStatus().Maxlines >= bigw.body.fr.GetFrameFillStatus().Maxlines {
bigw = w
}
if w.body.fr.GetFrameFillStatus().Maxlines-w.body.fr.GetFrameFillStatus().Nlines >= emptyw.body.fr.GetFrameFillStatus().Maxlines-emptyw.body.fr.GetFrameFillStatus().Nlines {
emptyw = w
}
}
emptyb = &emptyw.body
el = emptyb.fr.GetFrameFillStatus().Maxlines - emptyb.fr.GetFrameFillStatus().Nlines
// if empty space is big, use it
if el > 15 || (el > 3 && el > (bigw.body.fr.GetFrameFillStatus().Maxlines-1)/2) {
y = emptyb.fr.Rect().Min.Y + emptyb.fr.GetFrameFillStatus().Nlines*fontget(tagfont, t.display).Height()
} else {
// if this window is in column and isn't much smaller, split it
if t.col == c && t.w.r.Dy() > 2*bigw.r.Dy()/3 {
bigw = t.w
}
y = (bigw.r.Min.Y + bigw.r.Max.Y) / 2
}
w = c.Add(nil, nil, y)
if w.body.fr.GetFrameFillStatus().Maxlines < 2 {
w.col.Grow(w, 1)
}
return w
}
type Warning struct {
md *MntDir
buf file.RuneArray
}
var warnings = []*Warning{}
var warningsMu sync.Mutex
func flushwarnings() {
var (
w *Window
t *Text
owner, nr, q0, n int
)
for _, warn := range warnings {
w = errorwin(warn.md, 'E')
t = &w.body
owner = w.owner
if owner == 0 {
w.owner = 'E'
}
w.Commit(t) // marks the backing text as dirty
// Most commands don't generate much output. For instance,
// Edit ,>cat goes through /dev/cons and is already in blocks
// because of the i/o system, but a few can. Edit ,p will
// put the entire result into a single hunk. So it's worth doing
// this in blocks (and putting the text in a buffer in the first
// place), to avoid a big memory footprint.
q0 = t.Nc()
r := make([]rune, RBUFSIZE)
// TODO(rjk): Figure out why Warning doesn't use an file.ObservableEditableBuffer.
for n = 0; n < warn.buf.Nc(); n += nr {
nr = warn.buf.Nc() - n
if nr > RBUFSIZE {
nr = RBUFSIZE
}
warn.buf.Read(n, r[:nr])
_, nr = t.BsInsert(t.Nc(), r[:nr], true)
}
t.Show(q0, t.Nc(), true)
t.w.SetTag()
t.ScrDraw(t.fr.GetFrameFillStatus().Nchars)
w.owner = owner
t.file.TreatAsClean()
w.Unlock()
// warn.buf.Close()
if warn.md != nil {
mnt.DecRef(warn.md) // IncRef in addwarningtext
}
}
warnings = warnings[0:0]
}
func warning(md *MntDir, s string, args ...interface{}) {
r := []rune(fmt.Sprintf(s, args...))
addwarningtext(md, r)
}
func warnError(md *MntDir, s string, args ...interface{}) error {
err := fmt.Errorf(s, args...)
addwarningtext(md, []rune(err.Error()+"\n"))
return err
}
func addwarningtext(md *MntDir, r []rune) {
warningsMu.Lock()
defer warningsMu.Unlock()
for _, warn := range warnings {
if warn.md == md {
warn.buf.Insert(warn.buf.Nc(), r)
return
}
}
warn := Warning{}
warn.md = md
if md != nil {
mnt.IncRef(md) // DecRef in flushwarnings
}
warn.buf.Insert(0, r)
warnings = append(warnings, &warn)
select {
case cwarn <- 0:
default:
}
}
const quoteChar = '\''
func needsQuote(s string) bool {
for i := 0; i < len(s); i++ {
c := s[i]
if c == quoteChar || c <= ' ' { // quote, blanks, or control characters
return true
}
}
return false
}
// Quote adds single quotes to s in the style of rc(1) if they are needed.
// The behaviour should be identical to Plan 9's quote(3).
func quote(s string) string {
if s == "" {
return "''"
}
if !needsQuote(s) {
return s
}
var b strings.Builder
b.Grow(10 + len(s)) // Enough room for few quotes
b.WriteByte(quoteChar)
for i := 0; i < len(s); i++ {
c := s[i]
if c == quoteChar {
b.WriteByte(quoteChar)
}
b.WriteByte(c)
}
b.WriteByte(quoteChar)
return b.String()
}
func skipbl(r []rune) []rune {
return runes.TrimLeft(r, " \t\n")
}