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0.1.2 | Apr 22, 2020 |
#748 in Build Utils
133 downloads per month
Used in wrappe
18KB
280 lines
staticfilemap
Procedural macro to embed files during compilation with optional compression.
Similar to include_file!
or include_dir!
, but accepts a list of files that can be specified through environment variables and supports compression with LZ4 or zstd.
Usage
Derive from StaticFileMap
to create a map.
#[derive(StaticFileMap)]
#[files("README.md;LICENSE")]
struct StaticMap;
Specify the files to be included and the names they should be accessed by with the files
and names
attributes.
These can either be strings containing values separated with ;
, or environment variables containing them when the parse
attribute is set to env
.
Relative paths are resolved relative to CARGO_MANIFEST_DIR
. If the names
attribute is not specified, the names are inferred from the filenames.
Compression
The compression level is controlled by the compression
attribute. With a compression level above 0
the included files are compresed with Zstd. Zstd supports a compression level up to 22
.
Alternatively, LZ4 can be used for compression by setting the algorithm
attribute to lz4
. LZ4 accepts a compression level up to 12
.
The cargo features zstd
and lz4
are available to select compression support. zstd
is enabled by default.
Runtime
Files can be accessed as &'static [u8]
slices by the get(name)
and get_match(name)
functions at runtime.
get_match(name)
returns the file with a matching substring in its name if it exists and is unique.
iter()
, data()
and keys()
are available to iterate over the included files.
See the examples, the tests or the implementation for details.
Dependency
[dependencies]
staticfilemap = "^0.8"
Examples
use staticfilemap::StaticFileMap;
#[derive(StaticFileMap)]
#[names("a;b")]
#[files("README.md;LICENSE")]
struct StaticMap;
fn main() {
let content: &[u8] = StaticMap::get("b").unwrap();
let keys: &[&str] = StaticMap::keys();
}
use staticfilemap::StaticFileMap;
use zstd::decode_all;
#[derive(StaticFileMap)]
#[parse("env")]
#[names("FILENAMES")]
#[files("FILEPATHS")]
#[compression(8)]
struct StaticMap;
fn main() {
let mut compressed = StaticMap::get("diogenes.txt")
.expect("file diogenes.txt was not included");
let content = decode_all(&mut compressed);
}
use staticfilemap::StaticFileMap;
#[derive(StaticFileMap)]
#[files("README.md;LICENSE")]
struct StaticMap;
fn main() {
for (key, data) in StaticMap::iter() {
println!("{}: {}", key, String::from_utf8_lossy(data));
}
}
use staticfilemap::StaticFileMap;
use minilz4::Decode;
use std::io::Read;
#[derive(StaticFileMap)]
#[parse("env")]
#[names("FILENAMES")]
#[files("FILEPATHS")]
#[compression(8)]
#[algorithm("lz4")]
struct StaticMap;
fn main() {
let compressed = StaticMap::get_match("diogenes")
.expect("file matching diogenes was not included");
let content = compressed.decode();
}
Dependencies
~4MB
~70K SLoC