gix_worktree/stack/state/
mod.rs

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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
use bstr::{BString, ByteSlice};
use gix_glob::pattern::Case;

use crate::{stack::State, PathIdMapping};

#[cfg(feature = "attributes")]
type AttributeMatchGroup = gix_attributes::Search;
type IgnoreMatchGroup = gix_ignore::Search;

/// State related to attributes associated with files in the repository.
#[derive(Default, Clone)]
#[cfg(feature = "attributes")]
pub struct Attributes {
    /// Attribute patterns which aren't tied to the repository root, hence are global, they contribute first.
    globals: AttributeMatchGroup,
    /// Attribute patterns that match the currently set directory (in the stack).
    ///
    /// Note that the root-level file is always loaded, if present, followed by, the `$GIT_DIR/info/attributes`, if present, based
    /// on the location of the `info_attributes` file.
    stack: AttributeMatchGroup,
    /// The first time we push the root, we have to load additional information from this file if it exists along with the root attributes
    /// file if possible, and keep them there throughout.
    info_attributes: Option<std::path::PathBuf>,
    /// A lookup table to accelerate searches.
    collection: gix_attributes::search::MetadataCollection,
    /// Where to read `.gitattributes` data from.
    source: attributes::Source,
}

/// State related to the exclusion of files, supporting static overrides and globals, along with a stack of dynamically read
/// ignore files from disk or from the index each time the directory changes.
#[derive(Default, Clone)]
#[allow(unused)]
pub struct Ignore {
    /// Ignore patterns passed as overrides to everything else, typically passed on the command-line and the first patterns to
    /// be consulted.
    overrides: IgnoreMatchGroup,
    /// Ignore patterns that match the currently set director (in the stack), which is pushed and popped as needed.
    stack: IgnoreMatchGroup,
    /// Ignore patterns which aren't tied to the repository root, hence are global. They are consulted last.
    globals: IgnoreMatchGroup,
    /// A matching stack of pattern indices which is empty if we have just been initialized to indicate that the
    /// currently set directory had a pattern matched. Note that this one could be negated.
    /// (index into match groups, index into list of pattern lists, index into pattern list)
    matched_directory_patterns_stack: Vec<Option<(usize, usize, usize)>>,
    ///  The name of the file to look for in directories.
    pub(crate) exclude_file_name_for_directories: BString,
    /// Where to read ignore files from
    source: ignore::Source,
}

///
#[cfg(feature = "attributes")]
pub mod attributes;
///
pub mod ignore;

/// Initialization
impl State {
    /// Configure a state to be suitable for checking out files, which only needs access to attribute files read from the index.
    #[cfg(feature = "attributes")]
    pub fn for_checkout(
        unlink_on_collision: bool,
        validate: gix_validate::path::component::Options,
        attributes: Attributes,
    ) -> Self {
        State::CreateDirectoryAndAttributesStack {
            unlink_on_collision,
            validate,
            attributes,
        }
    }

    /// Configure a state for adding files, with support for ignore files and attribute files.
    #[cfg(feature = "attributes")]
    pub fn for_add(attributes: Attributes, ignore: Ignore) -> Self {
        State::AttributesAndIgnoreStack { attributes, ignore }
    }
}

/// Utilities
impl State {
    /// Returns a vec of tuples of relative index paths along with the best usable blob OID for
    /// either *ignore* or *attribute* files or both. This allows files to be accessed directly from
    /// the object database without the need for a worktree checkout.
    ///
    /// Note that this method…
    /// - ignores entries which aren't blobs.
    /// - ignores ignore entries which are not skip-worktree.
    /// - within merges, picks 'our' stage both for *ignore* and *attribute* files.
    ///
    /// * `index` is where we look for suitable files by path in order to obtain their blob hash.
    /// * `paths` is the indices storage backend for paths.
    /// * `case` determines if the search for files should be case-sensitive or not.
    pub fn id_mappings_from_index(
        &self,
        index: &gix_index::State,
        paths: &gix_index::PathStorageRef,
        case: Case,
    ) -> Vec<PathIdMapping> {
        let a1_backing;
        #[cfg(feature = "attributes")]
        let a2_backing;
        let names = match self {
            State::IgnoreStack(ignore) => {
                a1_backing = [(
                    ignore.exclude_file_name_for_directories.as_bytes().as_bstr(),
                    Some(ignore.source),
                )];
                a1_backing.as_ref()
            }
            #[cfg(feature = "attributes")]
            State::AttributesAndIgnoreStack { ignore, .. } => {
                a2_backing = [
                    (
                        ignore.exclude_file_name_for_directories.as_bytes().as_bstr(),
                        Some(ignore.source),
                    ),
                    (".gitattributes".into(), None),
                ];
                a2_backing.as_ref()
            }
            #[cfg(feature = "attributes")]
            State::CreateDirectoryAndAttributesStack { .. } | State::AttributesStack(_) => {
                a1_backing = [(".gitattributes".into(), None)];
                a1_backing.as_ref()
            }
        };

        index
            .entries()
            .iter()
            .filter_map(move |entry| {
                let path = entry.path_in(paths);

                // Stage 0 means there is no merge going on, stage 2 means it's 'our' side of the merge, but then
                // there won't be a stage 0.
                if entry.mode == gix_index::entry::Mode::FILE && (entry.stage_raw() == 0 || entry.stage_raw() == 2) {
                    let basename = path.rfind_byte(b'/').map_or(path, |pos| path[pos + 1..].as_bstr());
                    let ignore_source = names.iter().find_map(|t| {
                        match case {
                            Case::Sensitive => basename == t.0,
                            Case::Fold => basename.eq_ignore_ascii_case(t.0),
                        }
                        .then_some(t.1)
                    })?;
                    if let Some(source) = ignore_source {
                        match source {
                            ignore::Source::IdMapping => {}
                            ignore::Source::WorktreeThenIdMappingIfNotSkipped => {
                                // See https://github.com/git/git/blob/master/dir.c#L912:L912
                                if !entry.flags.contains(gix_index::entry::Flags::SKIP_WORKTREE) {
                                    return None;
                                }
                            }
                        };
                    }
                    Some((path.to_owned(), entry.id))
                } else {
                    None
                }
            })
            .collect()
    }

    pub(crate) fn ignore_or_panic(&self) -> &Ignore {
        match self {
            State::IgnoreStack(v) => v,
            #[cfg(feature = "attributes")]
            State::AttributesAndIgnoreStack { ignore, .. } => ignore,
            #[cfg(feature = "attributes")]
            State::AttributesStack(_) | State::CreateDirectoryAndAttributesStack { .. } => {
                unreachable!("BUG: must not try to check excludes without it being setup")
            }
        }
    }

    #[cfg(feature = "attributes")]
    pub(crate) fn attributes_or_panic(&self) -> &Attributes {
        match self {
            State::AttributesStack(attributes)
            | State::AttributesAndIgnoreStack { attributes, .. }
            | State::CreateDirectoryAndAttributesStack { attributes, .. } => attributes,
            State::IgnoreStack(_) => {
                unreachable!("BUG: must not try to check excludes without it being setup")
            }
        }
    }
}