chrono-lc/build.rs

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Rust
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extern crate serde;
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extern crate walkdir;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;
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use serde_json::Error as JsonError;
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use std::env;
use std::fs::File;
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use std::io::{Error as IoError, Read, Write};
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use std::path::Path;
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use walkdir::{DirEntry, WalkDir};
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#[derive(Deserialize)]
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pub struct Locale {
short_months: Option<Vec<String>>,
long_months: Option<Vec<String>>,
short_weekdays: Option<Vec<String>>,
long_weekdays: Option<Vec<String>>,
ampm: Option<Vec<String>>,
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}
fn main() {
let out_dir = env::var("OUT_DIR").unwrap();
let dest_path = Path::new(&out_dir).join("locales.rs");
let mut f = File::create(&dest_path).unwrap();
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let _ = f.write_all(
r#####"lazy_static! {
pub static ref LOCALES: Locales = {
let mut res = Locales {
short_months: HashMap::new(),
long_months: HashMap::new(),
short_weekdays: HashMap::new(),
long_weekdays: HashMap::new(),
ampm: HashMap::new(),
};
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"#####
.as_bytes(),
);
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println!("Building...");
for entry in WalkDir::new("locales") {
let entry = entry.unwrap();
println!("Found {}", entry.path().display());
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if entry.path().extension().map(|e| e != "json").unwrap_or(false) {
println!("Not a json file");
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continue;
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}
let locale_name = entry.path().file_stem().map(|n| n.to_string_lossy());
if locale_name.is_none() {
continue;
}
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let locale_name = locale_name.unwrap().to_string();
if let Ok(locale_data) = load_locale(&entry) {
if let Some(long_months) = locale_data.long_months {
if long_months.len() == 12 {
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let _ = f
.write_all(
format!(
"res.long_months.insert(\"{}\".into(), vec![{}]);\n",
locale_name,
long_months.iter().map(|s| format!("\"{}\"", s)).collect::<Vec<String>>().join(",")
).as_bytes(),
).unwrap();
}
}
if let Some(short_months) = locale_data.short_months {
if short_months.len() == 12 {
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let _ = f
.write_all(
format!(
"res.short_months.insert(\"{}\".into(), vec![{}]);\n",
locale_name,
short_months.iter().map(|s| format!("\"{}\"", s)).collect::<Vec<String>>().join(",")
).as_bytes(),
).unwrap();
}
}
if let Some(long_weekdays) = locale_data.long_weekdays {
if long_weekdays.len() == 7 {
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let _ = f
.write_all(
format!(
"res.long_weekdays.insert(\"{}\".into(), vec![{}]);\n",
locale_name,
long_weekdays.iter().map(|s| format!("\"{}\"", s)).collect::<Vec<String>>().join(",")
).as_bytes(),
).unwrap();
}
}
if let Some(short_weekdays) = locale_data.short_weekdays {
if short_weekdays.len() == 7 {
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let _ = f
.write_all(
format!(
"res.short_weekdays.insert(\"{}\".into(), vec![{}]);\n",
locale_name,
short_weekdays.iter().map(|s| format!("\"{}\"", s)).collect::<Vec<String>>().join(",")
).as_bytes(),
).unwrap();
}
}
if let Some(ampm) = locale_data.ampm {
if ampm.len() == 2 || ampm.len() == 4 {
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let _ = f
.write_all(
format!(
"res.ampm.insert(\"{}\".into(), vec![{}]);\n",
locale_name,
ampm.iter().map(|s| format!("\"{}\"", s)).collect::<Vec<String>>().join(",")
).as_bytes(),
).unwrap();
}
}
}
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}
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let _ = f.write_all(
r####" res
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};
}
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"####
.as_bytes(),
);
}
fn load_locale(entry: &DirEntry) -> Result<Locale, BuildError> {
let mut locale_data = String::new();
let mut f = File::open(entry.path())?;
f.read_to_string(&mut locale_data)?;
let locale = serde_json::from_str::<Locale>(&locale_data)?;
Ok(locale)
}
enum BuildError {
Io(IoError),
Json(JsonError),
}
impl From<IoError> for BuildError {
fn from(e: IoError) -> Self {
BuildError::Io(e)
}
}
impl From<JsonError> for BuildError {
fn from(e: JsonError) -> Self {
BuildError::Json(e)
}
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}