init

examples/write_to_child_stdin.v

@@ -0,0 +1,38 @@
+import io.string_reader
+import strings
+import runcmd
+
+fn main() {
+	input := 'Hello from parent process!'
+
+	// Prepare reader and writer.
+	//
+	// * `reader` reads input from the parent process; it will be copied to the
+	//    standard input of the child process.
+	// * `writer` accepts data from the child process; it will be copied from the
+	//    standard output of the child process.
+	mut reader := string_reader.StringReader.new(reader: runcmd.buffer(input.bytes()), source: input)
+	mut writer := strings.new_builder(4096)
+
+	// Prepare the command.
+	mut cmd := runcmd.new('cat')
+
+	// Set redirect_stdio to perform I/O copying between parent and child processes.
+	cmd.redirect_stdio = true
+
+	// Setup reader and writer for child I/O streams.
+	cmd.stdin = reader
+	cmd.stdout = writer
+
+	// Start and wait for command.
+	cmd.run()!
+
+	// Get command output as string.
+	output := writer.str()
+
+	// Make sure that `cat` returned the same data that we sent to it as input.
+	assert input == output, 'output data differs from input!'
+
+	println('Child state: ${cmd.state}')
+	println('Child output: ${output}')
+}