Merge remote-tracking branch 'origin/from_file'

Author: holyshared

README.md

@@ -45,7 +45,8 @@ fn main() {
 It can also be used to parse the report file.
 
 ```rust
-let records = LCOVParser::from("/path/to/report.lcov").parse().unwrap();
+let parser = LCOVParser::from_file("/path/to/report.lcov").unwrap();
+let records = parser.parse().unwrap();
 
 for record in records.iter() {
     match record {

examples/from_file.rs

@@ -3,7 +3,7 @@ extern crate lcov_parser;
 use lcov_parser:: { LCOVParser };
 
 fn main() {
-    let parser = LCOVParser::from("../../../fixture/report.lcov");
+    let parser = LCOVParser::from_file("../../../fixture/report.lcov").unwrap();
     let records = parser.parse().unwrap();
 
     for record in records.iter() {

src/parser.rs

@@ -15,6 +15,7 @@ use combinator:: { record, report };
 use std::io:: { Read };
 use std::fs:: { File };
 use std::result:: { Result };
+use std::io:: { Result as IOResult };
 use std::path:: { Path };
 use std::convert:: { From };
 use std::fmt:: { Display, Formatter, Result as FormatResult };
@@ -54,14 +55,11 @@ impl LCOVParser {
         let records = try!(parse_report(value));
         Ok(records)
     }
-}
-
-impl<P: AsRef<Path>> From<P> for LCOVParser {
-    fn from(path: P) -> Self {
-        let mut file = File::open(path).unwrap();
+    pub fn from_file<P: AsRef<Path>>(path: P) -> IOResult<Self> {
+        let mut file = try!(File::open(path));
         let mut buffer = String::new();
         let _ = file.read_to_string(&mut buffer);
-        LCOVParser::new(buffer.as_str())
+        Ok(LCOVParser::new(buffer.as_str()))
     }
 }