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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,50 +1,48 @@ | ||
| #![allow(clippy::style)] | ||
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| extern crate autocfg; | ||
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| use std::env; | ||
| use std::path::PathBuf; | ||
| use std::path::{Path, PathBuf}; | ||
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| fn main() -> std::io::Result<()> { | ||
| fn main() { | ||
| let ac = autocfg::new(); | ||
| ac.emit_rustc_version(1, 70); | ||
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| let outdir = match std::env::var_os("OUT_DIR") { | ||
| None => return Ok(()), | ||
| Some(outdir) => outdir, | ||
| }; | ||
| let outdir_path = PathBuf::from(outdir); | ||
| // Option::zip | ||
| ac.emit_rustc_version(1, 46); | ||
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| // Remove this comment if enabled proptests | ||
| // ::PROPERTY-TESTS:: autocfg::emit("property_tests"); | ||
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| write_default_precision(&outdir_path, "default_precision.rs")?; | ||
| Ok(()) | ||
| let outdir: PathBuf = std::env::var_os("OUT_DIR").unwrap().into(); | ||
| write_default_precision_file(&outdir); | ||
| write_default_rounding_mode(&outdir); | ||
| } | ||
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| /// Create default_precision.rs, containg definition of constant DEFAULT_PRECISION | ||
| fn write_default_precision(outdir_path: &PathBuf, filename: &str) -> std::io::Result<()> | ||
| { | ||
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| let default_prec = env::var("RUST_BIGDECIMAL_DEFAULT_PRECISION") | ||
| .map(|s| s.parse::<std::num::NonZeroU32>().expect("$RUST_BIGDECIMAL_DEFAULT_PRECISION must be an integer > 0")) | ||
| .map(|nz_num| nz_num.into()) | ||
| .unwrap_or(100u32); | ||
| /// Create default_precision.rs, containing definition of constant DEFAULT_PRECISION loaded in src/lib.rs | ||
| fn write_default_precision_file(outdir: &Path) { | ||
| let env_var = env::var("RUST_BIGDECIMAL_DEFAULT_PRECISION").unwrap_or_else(|_| "100".to_owned()); | ||
| println!("cargo:rerun-if-env-changed=RUST_BIGDECIMAL_DEFAULT_PRECISION"); | ||
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| let rust_file_path = outdir.join("default_precision.rs"); | ||
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| let default_precision_rs_path = outdir_path.join(filename); | ||
| let default_prec: u32 = env_var | ||
| .parse::<std::num::NonZeroU32>() | ||
| .expect("$RUST_BIGDECIMAL_DEFAULT_PRECISION must be an integer > 0") | ||
| .into(); | ||
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| let default_precision = format!("const DEFAULT_PRECISION: u64 = {};", default_prec); | ||
| let rust_file_contents = format!("const DEFAULT_PRECISION: u64 = {};", default_prec); | ||
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| std::fs::write(rust_file_path, rust_file_contents).unwrap(); | ||
| } | ||
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| // Rewriting the file if it already exists with the same contents | ||
| // would force a rebuild. | ||
| match std::fs::read_to_string(&default_precision_rs_path) { | ||
| Ok(existing_contents) if existing_contents == default_precision => {}, | ||
| _ => { | ||
| std::fs::write(&default_precision_rs_path, default_precision) | ||
| .expect("Could not write big decimal default-precision file"); | ||
| } | ||
| }; | ||
| /// Create default_rounding_mode.rs, using value of RUST_BIGDECIMAL_DEFAULT_ROUNDING_MODE environment variable | ||
| fn write_default_rounding_mode(outdir: &Path) { | ||
| let rounding_mode_name = env::var("RUST_BIGDECIMAL_DEFAULT_ROUNDING_MODE").unwrap_or_else(|_| "HalfEven".to_owned()); | ||
| println!("cargo:rerun-if-env-changed=RUST_BIGDECIMAL_DEFAULT_ROUNDING_MODE"); | ||
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| println!("cargo:rerun-if-changed={}", default_precision_rs_path.display()); | ||
| println!("cargo:rerun-if-env-changed={}", "RUST_BIGDECIMAL_DEFAULT_PRECISION"); | ||
| let rust_file_path = outdir.join("default_rounding_mode.rs"); | ||
| let rust_file_contents = format!("const DEFAULT_ROUNDING_MODE: RoundingMode = RoundingMode::{};", rounding_mode_name); | ||
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| Ok(()) | ||
| std::fs::write(rust_file_path, rust_file_contents).unwrap(); | ||
| } |
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