diff --git a/ui/build/context.go b/ui/build/context.go
index 0636631..c8b00c3 100644
--- a/ui/build/context.go
+++ b/ui/build/context.go
@@ -16,45 +16,14 @@
 
 import (
 	"context"
-	"io"
-	"os"
-	"time"
 
 	"android/soong/ui/logger"
+	"android/soong/ui/status"
+	"android/soong/ui/terminal"
 	"android/soong/ui/tracer"
 )
 
-type StdioInterface interface {
-	Stdin() io.Reader
-	Stdout() io.Writer
-	Stderr() io.Writer
-}
-
-type StdioImpl struct{}
-
-func (StdioImpl) Stdin() io.Reader  { return os.Stdin }
-func (StdioImpl) Stdout() io.Writer { return os.Stdout }
-func (StdioImpl) Stderr() io.Writer { return os.Stderr }
-
-var _ StdioInterface = StdioImpl{}
-
-type customStdio struct {
-	stdin  io.Reader
-	stdout io.Writer
-	stderr io.Writer
-}
-
-func NewCustomStdio(stdin io.Reader, stdout, stderr io.Writer) StdioInterface {
-	return customStdio{stdin, stdout, stderr}
-}
-
-func (c customStdio) Stdin() io.Reader  { return c.stdin }
-func (c customStdio) Stdout() io.Writer { return c.stdout }
-func (c customStdio) Stderr() io.Writer { return c.stderr }
-
-var _ StdioInterface = customStdio{}
-
-// Context combines a context.Context, logger.Logger, and StdIO redirection.
+// Context combines a context.Context, logger.Logger, and terminal.Writer.
 // These all are agnostic of the current build, and may be used for multiple
 // builds, while the Config objects contain per-build information.
 type Context struct{ *ContextImpl }
@@ -62,7 +31,8 @@
 	context.Context
 	logger.Logger
 
-	StdioInterface
+	Writer terminal.Writer
+	Status *status.Status
 
 	Thread tracer.Thread
 	Tracer tracer.Tracer
@@ -88,28 +58,3 @@
 		c.Tracer.Complete(name, c.Thread, begin, end)
 	}
 }
-
-// ImportNinjaLog imports a .ninja_log file into the tracer.
-func (c ContextImpl) ImportNinjaLog(filename string, startOffset time.Time) {
-	if c.Tracer != nil {
-		c.Tracer.ImportNinjaLog(c.Thread, filename, startOffset)
-	}
-}
-
-func (c ContextImpl) IsTerminal() bool {
-	if term, ok := os.LookupEnv("TERM"); ok {
-		return term != "dumb" && isTerminal(c.Stdout()) && isTerminal(c.Stderr())
-	}
-	return false
-}
-
-func (c ContextImpl) IsErrTerminal() bool {
-	if term, ok := os.LookupEnv("TERM"); ok {
-		return term != "dumb" && isTerminal(c.Stderr())
-	}
-	return false
-}
-
-func (c ContextImpl) TermWidth() (int, bool) {
-	return termWidth(c.Stdout())
-}