// status.rs

//

// Copyright 2020, Georges Racinet <georges.racinets@octobus.net>

//

// This software may be used and distributed according to the terms of the

// GNU General Public License version 2 or any later version.

use crate::error::CommandError;

use crate::ui::Ui;

use crate::utils::path_utils::relativize_paths;

use clap::{Arg, SubCommand};

use format_bytes::format_bytes;

use hg;

use hg::config::Config;

use hg::dirstate::has_exec_bit;

use hg::dirstate::TruncatedTimestamp;

use hg::dirstate::RANGE_MASK_31BIT;

use hg::errors::{HgError, IoResultExt};

use hg::lock::LockError;

use hg::manifest::Manifest;

use hg::matchers::AlwaysMatcher;

use hg::repo::Repo;

use hg::utils::files::get_bytes_from_os_string;

use hg::utils::hg_path::{hg_path_to_path_buf, HgPath};

use hg::{HgPathCow, StatusOptions};

use log::{info, warn};

use std::io;

pub const HELP_TEXT: &str = "

Show changed files in the working directory

This is a pure Rust version of `hg status`.

Some options might be missing, check the list below.

";

pub fn args() -> clap::App<'static, 'static> {

    SubCommand::with_name("status")

        .alias("st")

        .about(HELP_TEXT)

        .arg(

            Arg::with_name("all")

                .help("show status of all files")

                .short("-A")

                .long("--all"),

        )

        .arg(

            Arg::with_name("modified")

                .help("show only modified files")

                .short("-m")

                .long("--modified"),

        )

        .arg(

            Arg::with_name("added")

                .help("show only added files")

                .short("-a")

                .long("--added"),

        )

        .arg(

            Arg::with_name("removed")

                .help("show only removed files")

                .short("-r")

                .long("--removed"),

        )

        .arg(

            Arg::with_name("clean")

                .help("show only clean files")

                .short("-c")

                .long("--clean"),

        )

        .arg(

            Arg::with_name("deleted")

                .help("show only deleted files")

                .short("-d")

                .long("--deleted"),

        )

        .arg(

            Arg::with_name("unknown")

                .help("show only unknown (not tracked) files")

                .short("-u")

                .long("--unknown"),

        )

        .arg(

            Arg::with_name("ignored")

                .help("show only ignored files")

                .short("-i")

                .long("--ignored"),

        )

        .arg(

            Arg::with_name("no-status")

                .help("hide status prefix")

                .short("-n")

                .long("--no-status"),

        )

}

/// Pure data type allowing the caller to specify file states to display

#[derive(Copy, Clone, Debug)]

pub struct DisplayStates {

    pub modified: bool,

    pub added: bool,

    pub removed: bool,

    pub clean: bool,

    pub deleted: bool,

    pub unknown: bool,

    pub ignored: bool,

}

pub const DEFAULT_DISPLAY_STATES: DisplayStates = DisplayStates {

    modified: true,

    added: true,

    removed: true,

    clean: false,

    deleted: true,

    unknown: true,

    ignored: false,

};

pub const ALL_DISPLAY_STATES: DisplayStates = DisplayStates {

    modified: true,

    added: true,

    removed: true,

    clean: true,

    deleted: true,

    unknown: true,

    ignored: true,

};

impl DisplayStates {

    pub fn is_empty(&self) -> bool {

        !(self.modified

            || self.added

            || self.removed

            || self.clean

            || self.deleted

            || self.unknown

            || self.ignored)

    }

}

pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {

    let status_enabled_default = false;

    let status_enabled = invocation.config.get_option(b"rhg", b"status")?;

    if !status_enabled.unwrap_or(status_enabled_default) {

        return Err(CommandError::unsupported(

            "status is experimental in rhg (enable it with 'rhg.status = true' \

            or enable fallback with 'rhg.on-unsupported = fallback')"

        ));

    }

    // TODO: lift these limitations

    if invocation.config.get_bool(b"ui", b"tweakdefaults")? {

        return Err(CommandError::unsupported(

            "ui.tweakdefaults is not yet supported with rhg status",

        ));

    }

    if invocation.config.get_bool(b"ui", b"statuscopies")? {

        return Err(CommandError::unsupported(

            "ui.statuscopies is not yet supported with rhg status",

        ));

    }

    if invocation

        .config

        .get(b"commands", b"status.terse")

        .is_some()

    {

        return Err(CommandError::unsupported(

            "status.terse is not yet supported with rhg status",

        ));

    }

    let ui = invocation.ui;

    let config = invocation.config;

    let args = invocation.subcommand_args;

    let display_states = if args.is_present("all") {

        // TODO when implementing `--quiet`: it excludes clean files

        // from `--all`

        ALL_DISPLAY_STATES

    } else {

        let requested = DisplayStates {

            modified: args.is_present("modified"),

            added: args.is_present("added"),

            removed: args.is_present("removed"),

            clean: args.is_present("clean"),

            deleted: args.is_present("deleted"),

            unknown: args.is_present("unknown"),

            ignored: args.is_present("ignored"),

        };

        if requested.is_empty() {

            DEFAULT_DISPLAY_STATES

        } else {

            requested

        }

    };

    let no_status = args.is_present("no-status");

    let repo = invocation.repo?;

    if repo.has_sparse() || repo.has_narrow() {

        return Err(CommandError::unsupported(

            "rhg status is not supported for sparse checkouts or narrow clones yet"

        ));

    }

    let mut dmap = repo.dirstate_map_mut()?;

    let options = StatusOptions {

        // we're currently supporting file systems with exec flags only

        // anyway

        check_exec: true,

        list_clean: display_states.clean,

        list_unknown: display_states.unknown,

        list_ignored: display_states.ignored,

        collect_traversed_dirs: false,

    };

    let ignore_file = repo.working_directory_vfs().join(".hgignore"); // TODO hardcoded

    let (mut ds_status, pattern_warnings) = dmap.status(

        &AlwaysMatcher,

        repo.working_directory_path().to_owned(),

        vec![ignore_file],

        options,

    )?;

    if !pattern_warnings.is_empty() {

        warn!("Pattern warnings: {:?}", &pattern_warnings);

    }

    if !ds_status.bad.is_empty() {

        warn!("Bad matches {:?}", &(ds_status.bad))

    }

    if !ds_status.unsure.is_empty() {

        info!(

            "Files to be rechecked by retrieval from filelog: {:?}",

            &ds_status.unsure

        );

    }

    let mut fixup = Vec::new();

    if !ds_status.unsure.is_empty()

        && (display_states.modified || display_states.clean)

    {

        let p1 = repo.dirstate_parents()?.p1;

        let manifest = repo.manifest_for_node(p1).map_err(|e| {

            CommandError::from((e, &*format!("{:x}", p1.short())))

        })?;

        for to_check in ds_status.unsure {

            if unsure_is_modified(repo, &manifest, &to_check)? {

                if display_states.modified {

                    ds_status.modified.push(to_check);

                }

            } else {

                if display_states.clean {

                    ds_status.clean.push(to_check.clone());

                }

                fixup.push(to_check.into_owned())

            }

        }

    }

    if display_states.modified {

        display_status_paths(

            ui,

            repo,

            config,

            no_status,

            &mut ds_status.modified,

            b"M",

        )?;

    }

    if display_states.added {

        display_status_paths(

            ui,

            repo,

            config,

            no_status,

            &mut ds_status.added,

            b"A",

        )?;

    }

    if display_states.removed {

        display_status_paths(

            ui,

            repo,

            config,

            no_status,

            &mut ds_status.removed,

            b"R",

        )?;

    }

    if display_states.deleted {

        display_status_paths(

            ui,

            repo,

            config,

            no_status,

            &mut ds_status.deleted,

            b"!",

        )?;

    }

    if display_states.unknown {

        display_status_paths(

            ui,

            repo,

            config,

            no_status,

            &mut ds_status.unknown,

            b"?",

        )?;

    }

    if display_states.ignored {

        display_status_paths(

            ui,

            repo,

            config,

            no_status,

            &mut ds_status.ignored,

            b"I",

        )?;

    }

    if display_states.clean {

        display_status_paths(

            ui,

            repo,

            config,

            no_status,

            &mut ds_status.clean,

            b"C",

        )?;

    }

    let mut dirstate_write_needed = ds_status.dirty;

    let filesystem_time_at_status_start = ds_status

        .filesystem_time_at_status_start

        .map(TruncatedTimestamp::from);

    if (fixup.is_empty() || filesystem_time_at_status_start.is_none())

        && !dirstate_write_needed

    {

        // Nothing to update

        return Ok(());

    }

    // Update the dirstate on disk if we can

    let with_lock_result =

        repo.try_with_wlock_no_wait(|| -> Result<(), CommandError> {

            if let Some(mtime_boundary) = filesystem_time_at_status_start {

                for hg_path in fixup {

                    use std::os::unix::fs::MetadataExt;

                    let fs_path = hg_path_to_path_buf(&hg_path)

                        .expect("HgPath conversion");

                    // Specifically do not reuse `fs_metadata` from

                    // `unsure_is_clean` which was needed before reading

                    // contents. Here we access metadata again after reading

                    // content, in case it changed in the meantime.

                    let fs_metadata = repo

                        .working_directory_vfs()

                        .symlink_metadata(&fs_path)?;

                        let mode = fs_metadata.mode();

                        let size = fs_metadata.len() as u32 & RANGE_MASK_31BIT;