path: root/src/options.rs

use std::fs::File;
use std::path::PathBuf;
use std::process::{Command, Stdio};
use std::{cmp, env, fmt, io};

use anyhow::ensure;
use atty::Stream;
use clap::ArgMatches;

use crate::command::Commands;
use crate::error::OptionsError;
use crate::util::units::{Second, Unit};

use anyhow::Result;

#[cfg(not(windows))]
pub const DEFAULT_SHELL: &str = "sh";

#[cfg(windows)]
pub const DEFAULT_SHELL: &str = "cmd.exe";

/// Shell to use for executing benchmarked commands
#[derive(Debug, PartialEq)]
pub enum Shell {
    /// Default shell command
    Default(&'static str),

    /// Custom shell command specified via --shell
    Custom(Vec<String>),
}

impl Default for Shell {
    fn default() -> Self {
        Shell::Default(DEFAULT_SHELL)
    }
}

impl fmt::Display for Shell {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Shell::Default(cmd) => write!(f, "{}", cmd),
            Shell::Custom(cmdline) => write!(f, "{}", shell_words::join(cmdline)),
        }
    }
}

impl Shell {
    /// Parse given string as shell command line
    pub fn parse_from_str<'a>(s: &str) -> Result<Self, OptionsError<'a>> {
        let v = shell_words::split(s).map_err(OptionsError::ShellParseError)?;
        if v.is_empty() || v[0].is_empty() {
            return Err(OptionsError::EmptyShell);
        }
        Ok(Shell::Custom(v))
    }

    pub fn command(&self) -> Command {
        match self {
            Shell::Default(cmd) => Command::new(cmd),
            Shell::Custom(cmdline) => {
                let mut c = Command::new(&cmdline[0]);
                c.args(&cmdline[1..]);
                c
            }
        }
    }
}

/// Action to take when an executed command fails.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum CmdFailureAction {
    /// Exit with an error message
    RaiseError,

    /// Simply ignore the non-zero exit code
    Ignore,
}

/// Output style type option
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum OutputStyleOption {
    /// Do not output with colors or any special formatting
    Basic,

    /// Output with full color and formatting
    Full,

    /// Keep elements such as progress bar, but use no coloring
    NoColor,

    /// Keep coloring, but use no progress bar
    Color,

    /// Disable all the output
    Disabled,
}

/// Bounds for the number of benchmark runs
pub struct RunBounds {
    /// Minimum number of benchmark runs
    pub min: u64,

    /// Maximum number of benchmark runs
    pub max: Option<u64>,
}

impl Default for RunBounds {
    fn default() -> Self {
        RunBounds { min: 10, max: None }
    }
}

#[derive(Debug, Clone, PartialEq)]
pub enum CommandInputPolicy {
    /// Read from the null device
    Null,

    /// Read input from a file
    File(PathBuf),
}

impl Default for CommandInputPolicy {
    fn default() -> Self {
        CommandInputPolicy::Null
    }
}

impl CommandInputPolicy {
    pub fn get_stdin(&self) -> io::Result<Stdio> {
        let stream: Stdio = match self {
            CommandInputPolicy::Null => Stdio::null(),

            CommandInputPolicy::File(path) => {
                let file: File = File::open(path)?;
                Stdio::from(file)
            }
        };

        Ok(stream)
    }
}

/// How to handle the output of benchmarked commands
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum CommandOutputPolicy {
    /// Redirect output to the null device
    Null,

    /// Feed output through a pipe before discarding it
    Pipe,

    /// Redirect output to a file
    File(PathBuf),

    /// Show command output on the terminal
    Inherit,
}

impl Default for CommandOutputPolicy {
    fn default() -> Self {
        CommandOutputPolicy::Null
    }
}

impl CommandOutputPolicy {
    pub fn get_stdout_stderr(&self) -> io::Result<(Stdio, Stdio)> {
        let streams = match self {
            CommandOutputPolicy::Null => (Stdio::null(), Stdio::null()),

            // Typically only stdout is performance-relevant, so just pipe that
            CommandOutputPolicy::Pipe => (Stdio::piped(), Stdio::null()),

            CommandOutputPolicy::File(path) => {
                let file = File::create(path)?;
                (file.into(), Stdio::null())
            }

            CommandOutputPolicy::Inherit => (Stdio::inherit(), Stdio::inherit()),
        };

        Ok(streams)
    }
}

pub enum ExecutorKind {
    Raw,
    Shell(Shell),
    Mock(Option<String>),
}

impl Default for ExecutorKind {
    fn default() -> Self {
        ExecutorKind::Shell(Shell::default())
    }
}

/// The main settings for a hyperfine benchmark session
pub struct Options {
    /// Upper and lower bound for the number of benchmark runs
    pub run_bounds: RunBounds,

    /// Number of warmup runs
    pub warmup_count: u64,

    /// Minimum benchmarking time
    pub min_benchmarking_time: Second,

    /// Whether or not to ignore non-zero exit codes
    pub command_failure_action: CmdFailureAction,

    /// Command(s) to run before each timing run
    pub preparation_command: Option<Vec<String>>,

    /// Command to run before each *batch* of timing runs, i.e. before each individual benchmark
    pub setup_command: Option<String>,

    /// Command to run after each *batch* of timing runs, i.e. after each individual benchmark
    pub cleanup_command: Option<String>,

    /// What color mode to use for the terminal output
    pub output_style: OutputStyleOption,

    /// Determines how we run commands
    pub executor_kind: ExecutorKind,

    /// Where input to the benchmarked command comes from
    pub command_input_policy: CommandInputPolicy,

    /// What to do with the output of the benchmarked command
    pub command_output_policy: CommandOutputPolicy,

    /// Which time unit to use when displaying results
    pub time_unit: Option<Unit>,
}

impl Default for Options {
    fn default() -> Options {
        Options {
            run_bounds: RunBounds::default(),
            warmup_count: 0,
            min_benchmarking_time: 3.0,
            command_failure_action: CmdFailureAction::RaiseError,
            preparation_command: None,
            setup_command: None,
            cleanup_command: None,
            output_style: OutputStyleOption::Full,
            executor_kind: ExecutorKind::default(),
            command_output_policy: CommandOutputPolicy::Null,
            time_unit: None,
            command_input_policy: CommandInputPolicy::Null,
        }
    }
}

impl Options {
    pub fn from_cli_arguments<'a>(matches: &ArgMatches) -> Result<Self, OptionsError<'a>> {
        let mut options = Self::default();
        let param_to_u64 = |param| {
            matches
                .get_one::<String>(param)
                .map(|n| {
                    n.parse::<u64>()
                        .map_err(|e| OptionsError::IntParsingError(param, e))
                })
                .transpose()
        };

        options.warmup_count = param_to_u64("warmup")?.unwrap_or(options.warmup_count);

        let mut min_runs = param_to_u64("min-runs")?;
        let mut max_runs = param_to_u64("max-runs")?;

        if let Some(runs) = param_to_u64("runs")? {
            min_runs = Some(runs);
            max_runs = Some(runs);
        }

        match (min_runs, max_runs) {
            (Some(min), None) => {
                options.run_bounds.min = min;
            }
            (None, Some(max)) => {
                // Since the minimum was not explicit we lower it if max is below the default min.
                options.run_bounds.min = cmp::min(options.run_bounds.min, max);
                options.run_bounds.max