differential-engine 0.13.0

Core engine: git io, diff parsing, byte-exact apply, shape classes, invariants
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41

//! Added / removed line totals.

use crate::schema;

/// Line totals for a hunk, or any aggregation of hunks.
///
/// Canonical enumeration is `-U0`, so a hunk carries no context lines and the
/// counts are exactly its added and removed lines. Aggregating them was open-
/// coded in three places in the TUI alone, each re-deciding which schema field
/// meant which direction.
#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
pub struct LineCounts {
    pub adds: usize,
    pub dels: usize,
}

impl LineCounts {
    pub fn of_hunk(h: &schema::HunkEntry) -> Self {
        LineCounts {
            adds: h.new_count as usize,
            dels: h.old_count as usize,
        }
    }
}

impl std::ops::Add for LineCounts {
    type Output = LineCounts;

    fn add(self, rhs: LineCounts) -> LineCounts {
        LineCounts {
            adds: self.adds + rhs.adds,
            dels: self.dels + rhs.dels,
        }
    }
}

impl std::iter::Sum for LineCounts {
    fn sum<I: Iterator<Item = LineCounts>>(iter: I) -> LineCounts {
        iter.fold(LineCounts::default(), |a, b| a + b)
    }
}