initial work on comparison based filters

This enables filters such as
    -time > 2020-01-01
    -time < 2020-02-03
    ...
for time and duration, and later possibly also for more things (such as
a COUNT(...) construct).

This work tries to integrate them into the existing filter system as
seamless as possible, by providing a Comparator which implements
LogFilter.

The "type checking" is done at parse time, so nonsensical comparisons
like -time > 12s flat out give a parse error. This however might be
changed to a more dynamic system with run-time type checking, in which
case we could do away with the type parameter on Producer and simply
work with a generic Value. The comparator would then return an error if
two non-identical types would be compared.

Note that the system does not support arithmetic expressions, only
simple comparisons to constant values.

1 files changed, 11 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index ba834ce..9ed67cf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,7 +8,7 @@ use std::str::FromStr;
 use std::sync::atomic::{AtomicBool, Ordering};
 
 use anyhow::{anyhow, Context, Error, Result};
-use chrono::{DateTime, TimeZone, Utc};
+use chrono::{DateTime, Duration, TimeZone, Utc};
 use colored::Colorize;
 use log::debug;
 use regex::Regex;
@@ -156,6 +156,8 @@ pub struct LogResult {
     log_file: PathBuf,
     /// The time of the recording.
     time: DateTime<Utc>,
+    /// The duration of the fight.
+    duration: Duration,
     /// The boss.
     boss: Option<Boss>,
     /// A vector of all participating players.
@@ -550,9 +552,17 @@ fn extract_info(path: &Path, log: &Log) -> LogResult {
         .collect::<Vec<Player>>();
     players.sort();
 
+    let duration = log
+        .local_end_timestamp()
+        .and_then(|end| log.local_start_timestamp().map(|start| end - start))
+        .map(|x| x as i64)
+        .map(Duration::seconds)
+        .unwrap_or_else(Duration::zero);
+
     LogResult {
         log_file: path.to_path_buf(),
         time: Utc.timestamp(i64::from(log.local_end_timestamp().unwrap_or(0)), 0),
+        duration,
         boss,
         players,
         outcome: get_fight_outcome(log),