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examples: add an example of a simple process wrapper, built around an…
… interactive python process, in wrapping_interactive_python.v
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import os | ||
import time | ||
import term | ||
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python_exe := os.find_abs_path_of_executable('python') or { | ||
eprintln('This example needs a python executable in your PATH. Please install Python to see it in action.') | ||
exit(1) | ||
} | ||
mut p := os.new_process(python_exe) | ||
defer { | ||
dump(p.code) | ||
p.close() | ||
p.wait() | ||
} | ||
// The Python flags here, are needed to reduce clutter and buffering. | ||
// See https://docs.python.org/3/using/cmdline.html | ||
p.set_args(['-i', '-q', '-u']) | ||
p.set_redirect_stdio() | ||
p.run() | ||
dump(p.pid) | ||
println('This is a simple V wrapper/shell for the Python interpreter.') | ||
println('Try typing some python code here, or type `bye` to end your session:') | ||
for p.is_alive() { | ||
// check if there is any input from the user (it does not block, if there is not): | ||
if os.fd_is_pending(0) { | ||
cmd := os.get_raw_line() | ||
if cmd.len == 0 { | ||
println('closed stdin detected, perhaps due to Ctrl-D...exiting') | ||
break | ||
} | ||
if cmd.trim_space() == 'bye' { | ||
println('Goodbye...') | ||
break | ||
} | ||
p.stdin_write(cmd) | ||
} | ||
if oline := p.pipe_read(.stdout) { | ||
print(term.bright_yellow('python stdout: ') + term.bold(oline)) | ||
} | ||
if eline := p.pipe_read(.stderr) { | ||
eprint(term.red('python stderr: ') + eline) | ||
} | ||
time.sleep(20 * time.millisecond) | ||
} |