Update binaries and readme (#69)

Author: sadikovi

README.md

@@ -27,6 +27,18 @@ Run `cargo build` or `cargo build --release` to build in release mode.
 ## Test
 Run `cargo test` for unit tests.
 
+## Binaries
+The following binaries are provided (use `cargo install` to install them):
+- **parquet-schema** for printing Parquet file schema and metadata.
+`Usage: parquet-schema <file-path> [verbose]`, where `file-path` is the path to a Parquet file,
+and optional `verbose` is the boolean flag that allows to print full metadata or schema only
+(when not specified only schema will be printed).
+
+- **parquet-read** for reading records from a Parquet file.
+`Usage: parquet-read <file-path> [num-records]`, where `file-path` is the path to a Parquet file,
+and `num-records` is the number of records to read from a file (when not specified all records will
+be printed).
+
 ## Benchmarks
 Run `cargo bench` for benchmarks.
 

src/bin/parquet-read.rs

@@ -10,7 +10,7 @@ use parquet::file::reader::{FileReader, SerializedFileReader};
 fn main() {
   let args: Vec<String> = env::args().collect();
   if args.len() != 2 && args.len() != 3 {
-    println!("Usage: read-file <file-path> [num-records]");
+    println!("Usage: parquet-read <file-path> [num-records]");
     process::exit(1);
   }
 

src/bin/parquet-schema.rs

@@ -28,15 +28,15 @@ use parquet::schema::printer::{print_parquet_metadata, print_file_metadata};
 fn main() {
   let args: Vec<String> = env::args().collect();
   if args.len() != 2 && args.len() != 3 {
-    println!("Usage: dump-schema <file-path> <verbose>");
+    println!("Usage: parquet-schema <file-path> [verbose]");
     process::exit(1);
   }
   let path = Path::new(&args[1]);
   let mut verbose = false;
   if args.len() == 3 {
     match args[2].parse() {
       Ok(b) => verbose = b,
-      Err(e) => panic!("Error when reading value for <verbose> \
+      Err(e) => panic!("Error when reading value for [verbose] \
                         (expected either 'true' or 'false'): {}", e)
     }
   }

src/schema/printer.rs

@@ -59,7 +59,7 @@ pub fn print_schema(out: &mut io::Write, tp: &Type) {
     let mut printer = Printer::new(&mut s);
     printer.print(tp);
   }
-  write!(out, "{}", s);
+  writeln!(out, "{}", s);
 }
 
 #[allow(unused_must_use)]