~matthiasbeyer/imag

ref: 08ba6c68a6630e427c744250da9355900f464fc7 imag/lib/entry/libimagentrytag/src/tagable.rs -rw-r--r-- 4.0 KiB
08ba6c68Matthias Beyer Remove unused imports 2 years ago
                                                                                                    
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
//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015-2019 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//

use itertools::Itertools;

use libimagstore::store::Entry;
use libimagerror::errors::ErrorMsg as EM;

use toml_query::read::TomlValueReadExt;
use toml_query::read::Partial;
use toml_query::insert::TomlValueInsertExt;

use failure::Error;
use failure::Fallible as Result;
use crate::tag::{Tag, TagSlice};
use crate::tag::is_tag_str;

use toml::Value;

pub trait Tagable {

    fn get_tags(&self) -> Result<Vec<Tag>>;
    fn set_tags(&mut self, ts: &[Tag]) -> Result<()>;

    fn add_tag(&mut self, t: Tag) -> Result<()>;
    fn remove_tag(&mut self, t: Tag) -> Result<()>;

    fn has_tag(&self, t: TagSlice) -> Result<bool>;
    fn has_tags(&self, ts: &[Tag]) -> Result<bool>;

}

#[derive(Serialize, Deserialize, Debug)]
struct TagHeader {
    values: Vec<String>,
}

impl<'a> Partial<'a> for TagHeader {
    const LOCATION: &'static str = "tags";
    type Output                  = Self;
}

impl Tagable for Value {

    fn get_tags(&self) -> Result<Vec<Tag>> {
        self.read_partial::<TagHeader>()?
            .map(|header| {
                let _ = header.values
                    .iter()
                    .map(is_tag_str)
                    .collect::<Result<_>>()?;

                Ok(header.values)
            })
            .unwrap_or_else(|| Ok(vec![]))
    }

    fn set_tags(&mut self, ts: &[Tag]) -> Result<()> {
        let _ = ts
            .iter()
            .map(is_tag_str)
            .collect::<Result<Vec<_>>>()?;

        let header = TagHeader {
            values: ts.iter().unique().cloned().collect(),
        };

        debug!("Setting tags = {:?}", header);
        self.get_header_mut()
            .insert_serialized("tags", header)
            .map(|_| ())
            .map_err(|_| Error::from(EM::EntryHeaderWriteError))
    }

    fn add_tag(&mut self, t: Tag) -> Result<()> {
        let _ = is_tag_str(&t)?;

        let mut tags = self.get_tags()?;
        debug!("Pushing tag = {:?} to list = {:?}", t, tags);
        tags.push(t);
        self.set_tags(&tags)
    }

    fn remove_tag(&mut self, t: Tag) -> Result<()> {
        let _ = is_tag_str(&t)?;

        let mut tags = self.get_tags()?;
        tags.retain(|tag| *tag != t);
        self.set_tags(&tags)
    }

    fn has_tag(&self, t: TagSlice) -> Result<bool> {
        // use any() because Vec::contains() wants &String, but we do not want to allocate.
        self.get_tags().map(|v| v.iter().any(|s| s == t))
    }

    fn has_tags(&self, tags: &[Tag]) -> Result<bool> {
        let mut result = true;
        for tag in tags {
            result = result && self.has_tag(tag)?;
        }

        Ok(result)
    }

}

impl Tagable for Entry {

    fn get_tags(&self) -> Result<Vec<Tag>> {
        self.get_header().get_tags()
    }

    fn set_tags(&mut self, ts: &[Tag]) -> Result<()> {
        self.get_header_mut().set_tags(ts)
    }

    fn add_tag(&mut self, t: Tag) -> Result<()> {
        self.get_header_mut().add_tag(t)
    }

    fn remove_tag(&mut self, t: Tag) -> Result<()> {
        self.get_header_mut().remove_tag(t)
    }

    fn has_tag(&self, t: TagSlice) -> Result<bool> {
        self.get_header().has_tag(t)
    }

    fn has_tags(&self, ts: &[Tag]) -> Result<bool> {
        self.get_header().has_tags(ts)
    }

}