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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"
"strings"
"sync"
"android/soong/ui/status"
)
type smartStatusOutput struct {
writer Writer
formatter formatter
lock sync.Mutex
haveBlankLine bool
}
// NewSmartStatusOutput returns a StatusOutput that represents the
// current build status similarly to Ninja's built-in terminal
// output.
func NewSmartStatusOutput(w Writer, formatter formatter) status.StatusOutput {
return &smartStatusOutput{
writer: w,
formatter: formatter,
haveBlankLine: true,
}
}
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.requestLine()
}
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.
//
// Run this on every line in case the window has been resized while
// we're printing. This could be optimized to only re-run when we get
// SIGWINCH if it ever becomes too time consuming.
if max, ok := s.writer.termWidth(); ok {
if len(str) > max {
// TODO: Just do a max. Ninja elides the middle, but that's
// more complicated and these lines aren't that important.
str = str[:max]
}
}
// Move to the beginning on the line, print the output, then clear
// the rest of the line.
fmt.Fprint(s.writer, "\r", str, "\x1b[K")
s.haveBlankLine = false
}
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