tiempo-rs/src/commands/display.rs

use std::convert::TryFrom;
use std::io::Write;
use std::str::FromStr;

use clap::ArgMatches;
use chrono::{DateTime, Utc, Local, TimeZone, LocalResult};
use terminal_size::{Width, terminal_size};
use ansi_term::Color::Yellow;

use crate::error;
use crate::database::{Database, DBVersion};
use crate::formatters::Formatter;
use crate::config::Config;
use crate::models::Entry;

use super::Command;

fn local_to_utc(t: DateTime<Utc>) -> error::Result<DateTime<Utc>> {
    let local_time = match Local.from_local_datetime(&t.naive_utc()) {
        LocalResult::None => return Err(error::Error::NoneLocalTime(t.naive_utc())),
        LocalResult::Single(t) => t,
        LocalResult::Ambiguous(t1, t2) => return Err(error::Error::AmbiguousLocalTime {
            orig: t.naive_utc(),
            t1, t2,
        }),
    };

    Ok(Utc.from_utc_datetime(&local_time.naive_utc()))
}

fn local_to_utc_vec(entries: Vec<Entry>) -> error::Result<Vec<Entry>> {
    entries
        .into_iter()
        .map(|e| {
            Ok(Entry {
                start: local_to_utc(e.start)?,
                end: e.end.map(|t| local_to_utc(t)).transpose()?,
                ..e
            })
        })
        .collect()
}

fn term_width() -> usize {
    if let Some((Width(w), _)) = terminal_size() {
        w as usize
    } else {
        80
    }
}

enum Sheet {
    All,
    Full,
    Sheet(String),
}

impl FromStr for Sheet {
    type Err = error::Error;

    fn from_str(name: &str) -> error::Result<Sheet> {
        Ok(match name {
            "all" => Sheet::All,
            "full" => Sheet::Full,
            name => Sheet::Sheet(name.into()),
        })
    }
}

#[derive(Default)]
pub struct Args {
    ids: bool,
    start: Option<DateTime<Utc>>,
    end: Option<DateTime<Utc>>,
    format: Formatter,
    grep: Option<String>,
    sheet: Option<Sheet>,
}

impl<'a> TryFrom<&'a ArgMatches<'a>> for Args {
    type Error = error::Error;

    fn try_from(matches: &'a ArgMatches) -> error::Result<Args> {
        Ok(Args {
            ids: matches.is_present("ids"),
            start: matches.value_of("at").map(|s| s.parse()).transpose()?,
            end: matches.value_of("at").map(|s| s.parse()).transpose()?,
            format: matches.value_of("format").unwrap().parse()?,
            grep: matches.value_of("grep").map(|s| s.into()),
            sheet: matches.value_of("sheet").map(|s| s.parse()).transpose()?,
        })
    }
}

pub struct DisplayCommand { }

impl<'a> Command<'a> for DisplayCommand {
    type Args = Args;

    fn handle<D, O, E>(args: Self::Args, db: &mut D, out: &mut O, err: &mut E, config: &Config) -> error::Result<()>
    where
        D: Database,
        O: Write,
        E: Write,
    {
        let entries = match args.sheet {
            Some(Sheet::All) => db.entries_all_visible()?,
            Some(Sheet::Full) => db.entries_full()?,
            Some(Sheet::Sheet(name)) => db.entries_by_sheet(&name)?,
            None => {
                let current_sheet = db.current_sheet()?.unwrap_or("default".into());

                db.entries_by_sheet(&current_sheet)?
            }
        };

        let entries = if let DBVersion::Timetrap = db.version()? {
            // this indicates that times in the database are specified in the
            // local time and need to be converted to utc before displaying
            writeln!(
                err,
                "{} You are using the old timetrap format, it is advised that \
                you update your database using t migrate",
                Yellow.bold().paint("[WARNING]"),
            )?;

            local_to_utc_vec(entries)?
        } else {
            entries
        };

        args.format.print_formatted(
            entries,
            out,
            Utc::now(),
            args.ids,
            term_width(),
        )
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    use crate::database::SqliteDatabase;
    use crate::test_utils::PrettyString;

    #[test]
    fn display_as_local_time_if_previous_version() {
        let args = Default::default();
        let mut db = SqliteDatabase::from_path("assets/test_old_db.db").unwrap();
        let mut out = Vec::new();
        let mut err = Vec::new();
        let config = Default::default();

        DisplayCommand::handle(args, &mut db, &mut out, &mut err, &config).unwrap();

        assert_eq!(PrettyString(&String::from_utf8_lossy(&out)), PrettyString("Timesheet: default
    Day                Start      End        Duration Notes
    Tue Jun 29, 2021   06:26:49 - 07:26:52    1:00:03 lets do some rust
                                              1:00:03
    -------------------------------------------------------------------
    Total                                     1:00:03
"));

        assert_eq!(
            String::from_utf8_lossy(&err),
            format!("{} You are using the old timetrap format, it is advised that you update your database using t migrate\n", Yellow.bold().paint("[WARNING]")),
        );
    }

    #[test]
    #[ignore]
    fn correctly_use_utc_if_new_version() {
        assert!(false, "start with a newly created database");
        assert!(false, "correctly display times in local timezone");
    }
}