package b0

find_tool ~win_exe ~search tool is the file path, if any, to the program executable for the tool specification tool. For portability do not add an .exe suffix to tool on Windows, see the win_exe argument.

• If tool has a single path segment: the filename tool is searched, in list order, for the first matching executable file in the directories of search. search defaults to the env var PATH parsed with Fpath.list_of_search_path.
• If tool has multiple path segments: the file path tool is simply tested for existence and executability. Ok (Some tool) is returned if that is case and Ok None otherwise.
• If win_exe is true a .exe suffix is added to tool if it doesn't already have one. Defaults to Stdlib.Sys.win32.

get_tool is like find_tool except it errors if Ok None is returned.

get_first_tool tools is the first tool that can be found in the list with find_tool or an error if none is found. tools must be non-empty.

find cmd is like find_tool but looks and replaces cmd's B0_std.Cmd.tool.

get cmd is like get_tool but looks and replaces cmd's B0_std.Cmd.tool.

The type for process exit statuses.

pp_status is a formatter for process exit statuses of the form:

• "exited %d" for `Exited _ values
• "signaled %s" for `Signaled _ value

pp_cmd_status is a formatter for command process exit statuses of the form: "cmd [%a]: %a".

The type for representing the standard input of a process.

in_string s is a standard input that reads the string s.

in_file f is a standard input that reads from file f.

in_fd ~close fd is a standard input that reads from file descriptor fd. If close is true, fd is closed after the process is spawn.

in_stdin is in_fd ~close:false Unix.stdin, a standard input that reads from the current process standard input.

in_null is in_file File.null.

The type for representing the standard output of a process.

out_file ~force ~make_path file is a standard output that writes to file file.

• If make_path is true and the parent directory of file does not exist the whole path to the parent is created as needed with permission 0o755 (readable and traversable by everyone, writable by the user).
• If force is true and file exists at call time as a regular file it tries to overwrite it, in all other cases the function errors if file exists.
• mode are the permissions of the written file; they default to 0o644, readable by everyone, writable by the user.

out_fd ~close fd is a standard output that writes to file descriptor fd. If close is true, fd is closed after the process spawn.

out_stdout is out_fd ~close:false Unix.stdout

out_stderr is out_fd ~close:false Unix.stderr

out_null is out_file File.null

run_status ~env ~cwd ~stdin ~stdout ~stderr cmd runs and waits for the completion of cmd in environment env with current directory cwd and standard IO connections stdin, stdout and stderr.

• env defaults to Env.current_assignments ()
• cwd defaults to Dir.cwd ()
• stdin defaults to in_stdin
• stdout defaults to out_stdout
• stderr defaults to out_stderr

run_status_out is like run_status except stdout is read from the process to a string. The string is String.trimed if trim is true (default). If stderr is `Out the process' stderr is redirected to stdout and thus read back in the string aswell.

run is run_status with non-`Exited 0 statuses turned into errors via pp_cmd_status.

run_out is run_status_out with non-`Exited 0 statuses reporting the captured output (if any) prefixed by pp_cmd_status.

The type for process identifiers.

pid_to_int pid is the system identifier for process identifier pid.

spawn ~env ~cwd ~stdin ~stdout ~stderr cmd spawns command cmd in environment env with current directory cwd and standard IO connections stdin, stdout and stderr. env defaults to Env.current_assignments (), cwd to Dir.cwd (), stdin to in_stdin, stdout to out_stdout and stderr to out_stderr.

spawn_poll_status pid tries to collect the exit status of command spawn pid. If block is false, Ok None is immediately returned if pid has not terinated yet.

spawn_wait_status blocks and waits for pid's termination status to become available.

kill pid signal sends signal signal to the process pid.

Windows. Only the Sys.sigkill signal is emulated.

The type for spawn tracers. Called with each blocking and non-blocking spawned command aswell as execv. The function is given the process identifier of the spawn (or None in case of execv), the environment if different from the program's one, the current working directory if different from the program's one and the actual command.

spawn_tracer_nop is a spawn tracer that does nothing. This is the initial spawn tracer.

tracer () is the current spawn tracer. Initially this is spawn_tracer_nop.

set_tracer t sets the current spawn tracer to t.

execv ~env ~cwd file argv executes file file as a new process in environment env with args as the Sys.argv of this process (in particular Sys.argv.(0) is the name of the program not the first argument to the program). The function only recturns in case of error. env defaults to B0_std.Os.Env.current_assignments (), cwd to B0_std.Dir.cwd ().

Exit needs that alias to refer to B0_std.Cmd.t.