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
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154

use std::fmt;

use gix_hash::{oid, ObjectId};

use crate::{FullName, FullNameRef, Kind, Target, TargetRef};

impl<'a> TargetRef<'a> {
    /// Returns the kind of the target the ref is pointing to.
    pub fn kind(&self) -> Kind {
        match self {
            TargetRef::Symbolic(_) => Kind::Symbolic,
            TargetRef::Peeled(_) => Kind::Peeled,
        }
    }
    /// Interpret this target as object id which maybe `None` if it is symbolic.
    pub fn try_id(&self) -> Option<&oid> {
        match self {
            TargetRef::Symbolic(_) => None,
            TargetRef::Peeled(oid) => Some(oid),
        }
    }
    /// Interpret this target as object id or **panic** if it is symbolic.
    pub fn id(&self) -> &oid {
        match self {
            TargetRef::Symbolic(_) => panic!("BUG: tries to obtain object id from symbolic target"),
            TargetRef::Peeled(oid) => oid,
        }
    }
    /// Interpret this target as name of the reference it points to which maybe `None` if it an object id.
    pub fn try_name(&self) -> Option<&FullNameRef> {
        match self {
            TargetRef::Symbolic(name) => Some(name),
            TargetRef::Peeled(_) => None,
        }
    }
    /// Convert this instance into an owned version, without consuming it.
    pub fn into_owned(self) -> Target {
        self.into()
    }
}

impl Target {
    /// Returns the kind of the target the ref is pointing to.
    pub fn kind(&self) -> Kind {
        match self {
            Target::Symbolic(_) => Kind::Symbolic,
            Target::Peeled(_) => Kind::Peeled,
        }
    }

    /// Return true if this is a peeled target with a null hash
    pub fn is_null(&self) -> bool {
        match self {
            Target::Peeled(oid) => oid.is_null(),
            Target::Symbolic(_) => false,
        }
    }

    /// Interpret this owned Target as shared Target
    pub fn to_ref(&self) -> TargetRef<'_> {
        match self {
            Target::Peeled(oid) => TargetRef::Peeled(oid),
            Target::Symbolic(name) => TargetRef::Symbolic(name.as_ref()),
        }
    }

    /// Interpret this target as object id which maybe `None` if it is symbolic.
    pub fn try_id(&self) -> Option<&oid> {
        match self {
            Target::Symbolic(_) => None,
            Target::Peeled(oid) => Some(oid),
        }
    }
    /// Interpret this target as object id or panic if it is symbolic.
    pub fn id(&self) -> &oid {
        match self {
            Target::Symbolic(_) => panic!("BUG: tries to obtain object id from symbolic target"),
            Target::Peeled(oid) => oid,
        }
    }
    /// Return the contained object id or panic
    pub fn into_id(self) -> ObjectId {
        match self {
            Target::Symbolic(_) => panic!("BUG: expected peeled reference target but found symbolic one"),
            Target::Peeled(oid) => oid,
        }
    }

    /// Return the contained object id if the target is peeled or itself if it is not.
    pub fn try_into_id(self) -> Result<ObjectId, Self> {
        match self {
            Target::Symbolic(_) => Err(self),
            Target::Peeled(oid) => Ok(oid),
        }
    }
    /// Interpret this target as name of the reference it points to which maybe `None` if it an object id.
    pub fn try_name(&self) -> Option<&FullNameRef> {
        match self {
            Target::Symbolic(name) => Some(name.as_ref()),
            Target::Peeled(_) => None,
        }
    }
}

impl<'a> From<TargetRef<'a>> for Target {
    fn from(src: TargetRef<'a>) -> Self {
        match src {
            TargetRef::Peeled(oid) => Target::Peeled(oid.to_owned()),
            TargetRef::Symbolic(name) => Target::Symbolic(name.to_owned()),
        }
    }
}

impl<'a> PartialEq<TargetRef<'a>> for Target {
    fn eq(&self, other: &TargetRef<'a>) -> bool {
        match (self, other) {
            (Target::Peeled(lhs), TargetRef::Peeled(rhs)) => lhs == rhs,
            (Target::Symbolic(lhs), TargetRef::Symbolic(rhs)) => lhs.as_bstr() == rhs.as_bstr(),
            _ => false,
        }
    }
}

impl From<ObjectId> for Target {
    fn from(id: ObjectId) -> Self {
        Target::Peeled(id)
    }
}

impl TryFrom<Target> for ObjectId {
    type Error = Target;

    fn try_from(value: Target) -> Result<Self, Self::Error> {
        match value {
            Target::Peeled(id) => Ok(id),
            Target::Symbolic(_) => Err(value),
        }
    }
}

impl From<FullName> for Target {
    fn from(name: FullName) -> Self {
        Target::Symbolic(name)
    }
}

impl fmt::Display for Target {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Target::Peeled(oid) => oid.fmt(f),
            Target::Symbolic(name) => write!(f, "ref: {}", name.as_bstr()),
        }
    }
}