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
|
use std::path::Path;
use std::path::PathBuf;
use std::collections::HashMap;
use std::path::Component;
use std::convert::TryFrom;
use walkdir::DirEntry;
use walkdir::WalkDir;
use anyhow::anyhow;
use anyhow::Context;
use anyhow::Result;
use anyhow::Error;
use resiter::Map;
use resiter::AndThen;
pub struct FileSystemRepresentation {
root: PathBuf,
elements: HashMap<PathComponent, Element>,
files: Vec<PathBuf>,
}
enum Element {
File(String),
Dir(HashMap<PathComponent, Element>)
}
impl Element {
fn get_map_mut(&mut self) -> Option<&mut HashMap<PathComponent, Element>> {
match self {
Element::File(_) => None,
Element::Dir(ref mut hm) => Some(hm),
}
}
}
#[derive(Clone, PartialEq, Eq, Hash)]
enum PathComponent {
PkgToml,
DirName(String),
}
impl TryFrom<&std::path::Component<'_>> for PathComponent {
type Error = anyhow::Error;
fn try_from(c: &std::path::Component) -> Result<Self> {
match *c {
Component::Prefix(_) => anyhow::bail!("Unexpected path component: Prefix"),
Component::RootDir => anyhow::bail!("Unexpected path component: RootDir"),
Component::CurDir => anyhow::bail!("Unexpected path component: CurDir"),
Component::ParentDir => anyhow::bail!("Unexpected path component: ParentDir"),
Component::Normal(filename) => {
let filename = filename.to_str().ok_or_else(|| anyhow!("UTF8-error"))?;
if filename == "pkg.toml" {
Ok(PathComponent::PkgToml)
} else {
Ok(PathComponent::DirName(filename.to_string()))
}
},
}
}
}
impl FileSystemRepresentation {
pub fn load(root: PathBuf) -> Result<Self> {
let mut fsr = FileSystemRepresentation {
root: root.clone(),
elements: HashMap::new(),
files: vec![],
};
WalkDir::new(root)
.follow_links(false)
.max_open(100)
.same_file_system(true)
.into_iter()
.filter_entry(|e| is_pkgtoml(e))
.inspect(|el| log::trace!("Loading: {:?}", el))
.map_err(Error::from)
.and_then_ok(|de| {
let mut curr_hm = &mut fsr.elements;
fsr.files.push(de.path().to_path_buf());
// traverse the HashMap tree
for cmp in de.path().components() {
match PathComponent::try_from(&cmp)? {
PathComponent::PkgToml => {
curr_hm.entry(PathComponent::PkgToml)
.or_insert(Element::File(load_file(de.path())?));
},
dir @ PathComponent::DirName(_) => {
curr_hm.entry(dir.clone())
.or_insert(Element::Dir(HashMap::new()));
curr_hm = curr_hm.get_mut(&dir)
.unwrap() // safe, because we just inserted it
.get_map_mut()
.unwrap(); // safe, because we inserted Element::Dir
},
}
}
Ok(())
})
.collect::<Result<Vec<_>>>()?;
Ok(fsr)
}
pub fn is_leaf_file(&self, path: &Path) -> Result<bool> {
let mut curr_hm = &self.elements;
fn toml_files_in_tree(hm: &HashMap<PathComponent, Element>) -> bool {
for value in hm.values() {
match value {
Element::File(_) => return true,
Element::Dir(hm) => if toml_files_in_tree(hm) {
return true
},
}
}
false
}
for elem in path.components() {
let elem = PathComponent::try_from(&elem)?;
match curr_hm.get(&elem) {
Some(Element::File(_)) => {
// if I have a file now, and the current hashmap only holds either
// * No directory
// * or a directory where all subdirs do not contain a pkg.toml
return Ok(curr_hm.values().count() == 1 || !toml_files_in_tree(curr_hm))
},
Some(Element::Dir(hm)) => curr_hm = hm,
None => {
unimplemented!()
},
}
}
Ok(false)
}
pub fn get_files_for<'a>(&'a self, path: &Path) -> Result<Vec<&'a String>> {
let mut res = Vec::with_capacity(10); // good enough
let mut curr_hm = &self.elements;
for elem in path.components() {
let elem = PathComponent::try_from(&elem)?;
match curr_hm.get(&elem) {
Some(Element::File(cont)) => res.push(cont),
Some(Element::Dir(hm)) => curr_hm = hm,
None => {
unimplemented!()
},
}
}
Ok(res)
}
}
fn is_pkgtoml(entry: &DirEntry) -> bool {
entry.file_name().to_str().map(|s| s == "pkg.toml").unwrap_or(false)
}
fn load_file(path: &Path) -> Result<String> {
std::fs::read_to_string(path)
.with_context(|| anyhow!("Reading file from filesystem: {}", path.display()))
.map_err(Error::from)
}
|
