add git commit/date info to the output of -V

Author: Jorge Aparicio

Cargo.toml

@@ -1,5 +1,6 @@
 [package]
 authors = ["Jorge Aparicio <[email protected]>"]
+build = "build.rs"
 name = "svd2rust"
 version = "0.1.0"
 

build.rs

@@ -0,0 +1,46 @@
+use std::env;
+use std::error::Error;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+use std::process::Command;
+
+struct IgnoredError {}
+
+impl<E> From<E> for IgnoredError
+    where E: Error
+{
+    fn from(_: E) -> IgnoredError {
+        IgnoredError {}
+    }
+}
+
+fn main() {
+    let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+
+    File::create(out_dir.join("commit-info.txt"))
+        .unwrap()
+        .write_all(commit_info().as_bytes())
+        .unwrap();
+}
+
+fn commit_info() -> String {
+    match (commit_hash(), commit_date()) {
+        (Ok(hash), Ok(date)) => format!(" ({} {})", hash.trim(), date.trim()),
+        _ => String::new(),
+    }
+}
+
+fn commit_hash() -> Result<String, IgnoredError> {
+    Ok(try!(String::from_utf8(try!(Command::new("git")
+            .args(&["rev-parse", "--short", "HEAD"])
+            .output())
+        .stdout)))
+}
+
+fn commit_date() -> Result<String, IgnoredError> {
+    Ok(try!(String::from_utf8(try!(Command::new("git")
+            .args(&["log", "-1", "--date=short", "--pretty=format:%cd"])
+            .output())
+        .stdout)))
+}

src/lib.rs

@@ -40,7 +40,7 @@ pub fn gen_peripheral(p: &Peripheral, d: &Defaults) -> Vec<Tokens> {
 
         let field_ty = Ident::new(register.name.to_pascal_case());
         let field_name = Ident::new(register.name.to_snake_case());
-        fields.push(quote! { 
+        fields.push(quote! {
             #[doc = #comment]
             pub #field_name : #field_ty
         });
@@ -114,7 +114,7 @@ pub fn gen_register(r: &Register, d: &Defaults) -> Vec<Tokens> {
                     }
                 }
             });
-        },
+        }
 
         Access::ReadWrite => {
             items.push(quote! {
@@ -149,7 +149,7 @@ pub fn gen_register(r: &Register, d: &Defaults) -> Vec<Tokens> {
                     }
                 }
             });
-        },
+        }
 
         Access::WriteOnly => {
             items.push(quote! {
@@ -170,7 +170,7 @@ pub fn gen_register(r: &Register, d: &Defaults) -> Vec<Tokens> {
                     }
                 }
             });
-        },
+        }
 
         _ => unreachable!(),
     }
@@ -207,7 +207,9 @@ pub fn gen_register_r(r: &Register, d: &Defaults) -> Vec<Tokens> {
             let bits = if width == 1 {
                 format!("Bit {}", field.bit_range.offset)
             } else {
-                format!("Bits {}:{}", field.bit_range.offset, field.bit_range.offset + width - 1)
+                format!("Bits {}:{}",
+                        field.bit_range.offset,
+                        field.bit_range.offset + width - 1)
             };
 
             let comment = &format!("{} - {}", bits, respace(description))[..];
@@ -289,7 +291,9 @@ pub fn gen_register_w(r: &Register, d: &Defaults) -> Vec<Tokens> {
             let bits = if width == 1 {
                 format!("Bit {}", field.bit_range.offset)
             } else {
-                format!("Bits {}:{}", field.bit_range.offset, field.bit_range.offset + width - 1)
+                format!("Bits {}:{}",
+                        field.bit_range.offset,
+                        field.bit_range.offset + width - 1)
             };
 
             let comment = &format!("{} - {}", bits, respace(description))[..];

src/main.rs

@@ -20,7 +20,8 @@ fn main() {
         .arg(Arg::with_name("peripheral")
             .help("Pattern used to select a single peripheral")
             .value_name("PATTERN"))
-        .version(env!("CARGO_PKG_VERSION"))
+        .version(concat!(env!("CARGO_PKG_VERSION"),
+                         include_str!(concat!(env!("OUT_DIR"), "/commit-info.txt"))))
         .get_matches();
 
     let xml = &mut String::new();