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move some commonly used constants into a single module

This commit is contained in:
Lynne Megido 2021-06-14 17:07:38 +10:00
parent 1ecc6e6c6e
commit 6934dd0b5e
Signed by: lynnesbian
GPG Key ID: F0A184B5213D9F90
4 changed files with 45 additions and 36 deletions
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4
src/formats.rs
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@ -10,8 +10,8 @@ use cfg_if::cfg_if;
use snailquote::escape;
use crate::findings::ScanError;
use crate::parameters::VERSION;
use crate::{Findings, BACKEND};
use crate::utils::{VERSION, BACKEND};
use crate::{Findings};
use itertools::Itertools;
/// A macro for creating an array of `Writable`s without needing to pepper your code with `into()`s.

6
src/main.rs
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@ -45,18 +45,15 @@ pub(crate) mod string_type;
#[cfg(test)]
mod tests;
mod utils;
cfg_if! {
if #[cfg(any(all(unix, feature = "infer-backend"), all(not(unix), not(feature = "xdg-mime-backend"))))] {
/// A [OnceCell] holding an instance of [mime_db::MimeDb].
static MIMEDB: OnceCell<mime_db::InferDb> = OnceCell::new();
/// The backend being used; either "Infer" or "XDG-Mime".
const BACKEND: &str = "Infer";
} else {
/// A [OnceCell] holding an instance of [mime_db::MimeDb].
static MIMEDB: OnceCell<mime_db::XdgDb> = OnceCell::new();
/// The backend being used; either "Infer" or "XDG-Mime".
const BACKEND: &str = "XDG-Mime";
}
}
@ -74,6 +71,7 @@ fn main() {
// .target(env_logger::Target::Stdout) // log to stdout rather than stderr
.init();
// trace!("fif {}", CLAP_LONG_VERSION.get().unwrap());
trace!("Initialise mimetype database");
init_db();

31
src/parameters.rs
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@ -1,10 +1,9 @@
//! [Clap] struct used to parse command line arguments.
use crate::string_type::String as StringType;
use crate::BACKEND;
use crate::utils::{clap_version, clap_long_version};
use cfg_if::cfg_if;
use clap::{AppSettings, Clap};
use once_cell::sync::OnceCell;
use std::collections::BTreeSet;
use std::path::PathBuf;
@ -16,34 +15,6 @@ cfg_if! {
}
}
/// The current version of fif, as defined in Cargo.toml.
pub const VERSION: Option<&'static str> = option_env!("CARGO_PKG_VERSION");
// the version and long_version given to clap need to be a &str, but we want to use format!, which returns a String.
// we can't just do something like `version = format!(...).as_str()`, because clap needs to know that the version will
// live for a given lifetime, which we need to satisfy by making our String static. of course, you can't use format!
// statically, so we need to use a OnceCell or similar to get around this.
static CLAP_VERSION: OnceCell<String> = OnceCell::new();
static CLAP_LONG_VERSION: OnceCell<String> = OnceCell::new();
/// Sets [`CLAP_VERSION`] to be the version defined in Cargo.toml, prefixed with a v (e.g. "v0.3.1"), then returns it as
/// a String.
fn clap_version() -> &'static str {
CLAP_VERSION
.set(format!("v{}", VERSION.unwrap_or("???")))
.unwrap_or_default(); // it doesn't matter if CLAP_VERSION has already been set
CLAP_VERSION.get().unwrap().as_str()
}
/// Sets [`CLAP_LONG_VERSION`] to be similar to [`CLAP_VERSION`], followed by the chosen backend in parentheses (e.g.
/// "v0.3.1 (XDG-Mime backend)"), then returns it as a String.
fn clap_long_version() -> &'static str {
CLAP_LONG_VERSION
.set(format!("v{} ({} backend)", VERSION.unwrap_or("???"), BACKEND))
.unwrap_or_default();
CLAP_LONG_VERSION.get().unwrap().as_str()
}
#[derive(Clap, PartialEq, Debug)]
pub enum OutputFormat {
/// A Bourne shell compatible script.

40
src/utils.rs Normal file
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@ -0,0 +1,40 @@
use once_cell::sync::OnceCell;
use cfg_if::cfg_if;
/// The current version of fif, as defined in Cargo.toml.
pub const VERSION: Option<&'static str> = option_env!("CARGO_PKG_VERSION");
cfg_if! {
if #[cfg(any(all(unix, feature = "infer-backend"), all(not(unix), not(feature = "xdg-mime-backend"))))] {
/// The backend being used; either "Infer" or "XDG-Mime".
pub const BACKEND: &str = "Infer";
} else {
/// The backend being used; either "Infer" or "XDG-Mime".
pub const BACKEND: &str = "XDG-Mime";
}
}
// the version and long_version given to clap need to be a &str, but we want to use format!, which returns a String.
// we can't just do something like `version = format!(...).as_str()`, because clap needs to know that the version will
// live for a given lifetime, which we need to satisfy by making our String static. of course, you can't use format!
// statically, so we need to use a OnceCell or similar to get around this.
static CLAP_VERSION: OnceCell<String> = OnceCell::new();
static CLAP_LONG_VERSION: OnceCell<String> = OnceCell::new();
/// Sets [`CLAP_VERSION`] to be the version defined in Cargo.toml, prefixed with a v (e.g. "v0.3.1"), then returns it as
/// a String.
pub(crate) fn clap_version() -> &'static str {
CLAP_VERSION
.set(format!("v{}", VERSION.unwrap_or("???")))
.unwrap_or_default(); // it doesn't matter if CLAP_VERSION has already been set
CLAP_VERSION.get().unwrap().as_str()
}
/// Sets [`CLAP_LONG_VERSION`] to be similar to [`CLAP_VERSION`], followed by the chosen backend in parentheses (e.g.
/// "v0.3.1 (XDG-Mime backend)"), then returns it as a String.
pub(crate) fn clap_long_version() -> &'static str {
CLAP_LONG_VERSION
.set(format!("v{} ({} backend)", VERSION.unwrap_or("???"), BACKEND))
.unwrap_or_default();
CLAP_LONG_VERSION.get().unwrap().as_str()
}