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// Copyright 2019 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package terminal
import (
"fmt"
"io"
"os"
"os/signal"
"strings"
"sync"
"syscall"
"android/soong/ui/status"
)
type smartStatusOutput struct {
writer io.Writer
formatter formatter
lock sync.Mutex
haveBlankLine bool
termWidth int
sigwinch chan os.Signal
sigwinchHandled chan bool
}
// NewSmartStatusOutput returns a StatusOutput that represents the
// current build status similarly to Ninja's built-in terminal
// output.
func NewSmartStatusOutput(w io.Writer, formatter formatter) status.StatusOutput {
s := &smartStatusOutput{
writer: w,
formatter: formatter,
haveBlankLine: true,
sigwinch: make(chan os.Signal),
}
s.updateTermSize()
s.startSigwinch()
return s
}
func (s *smartStatusOutput) Message(level status.MsgLevel, message string) {
if level < status.StatusLvl {
return
}
str := s.formatter.message(level, message)
s.lock.Lock()
defer s.lock.Unlock()
if level > status.StatusLvl {
s.print(str)
} else {
s.statusLine(str)
}
}
func (s *smartStatusOutput) StartAction(action *status.Action, counts status.Counts) {
str := action.Description
if str == "" {
str = action.Command
}
progress := s.formatter.progress(counts)
s.lock.Lock()
defer s.lock.Unlock()
s.statusLine(progress + str)
}
func (s *smartStatusOutput) FinishAction(result status.ActionResult, counts status.Counts) {
str := result.Description
if str == "" {
str = result.Command
}
progress := s.formatter.progress(counts) + str
output := s.formatter.result(result)
s.lock.Lock()
defer s.lock.Unlock()
if output != "" {
s.statusLine(progress)
s.requestLine()
s.print(output)
} else {
s.statusLine(progress)
}
}
func (s *smartStatusOutput) Flush() {
s.lock.Lock()
defer s.lock.Unlock()
s.stopSigwinch()
s.requestLine()
}
func (s *smartStatusOutput) Write(p []byte) (int, error) {
s.lock.Lock()
defer s.lock.Unlock()
s.print(string(p))
return len(p), nil
}
func (s *smartStatusOutput) requestLine() {
if !s.haveBlankLine {
fmt.Fprintln(s.writer)
s.haveBlankLine = true
}
}
func (s *smartStatusOutput) print(str string) {
if !s.haveBlankLine {
fmt.Fprint(s.writer, "\r", "\x1b[K")
s.haveBlankLine = true
}
fmt.Fprint(s.writer, str)
if len(str) == 0 || str[len(str)-1] != '\n' {
fmt.Fprint(s.writer, "\n")
}
}
func (s *smartStatusOutput) statusLine(str string) {
idx := strings.IndexRune(str, '\n')
if idx != -1 {
str = str[0:idx]
}
// Limit line width to the terminal width, otherwise we'll wrap onto
// another line and we won't delete the previous line.
if s.termWidth > 0 {
str = s.elide(str)
}
// Move to the beginning on the line, turn on bold, print the output,
// turn off bold, then clear the rest of the line.
start := "\r\x1b[1m"
end := "\x1b[0m\x1b[K"
fmt.Fprint(s.writer, start, str, end)
s.haveBlankLine = false
}
func (s *smartStatusOutput) elide(str string) string {
if len(str) > s.termWidth {
// TODO: Just do a max. Ninja elides the middle, but that's
// more complicated and these lines aren't that important.
str = str[:s.termWidth]
}
return str
}
func (s *smartStatusOutput) startSigwinch() {
signal.Notify(s.sigwinch, syscall.SIGWINCH)
go func() {
for _ = range s.sigwinch {
s.lock.Lock()
s.updateTermSize()
s.lock.Unlock()
if s.sigwinchHandled != nil {
s.sigwinchHandled <- true
}
}
}()
}
func (s *smartStatusOutput) stopSigwinch() {
signal.Stop(s.sigwinch)
close(s.sigwinch)
}
func (s *smartStatusOutput) updateTermSize() {
if w, ok := termWidth(s.writer); ok {
s.termWidth = w
}
}
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