intial commit: line of code in rust

1 files changed, 96 insertions, 0 deletions

diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..b054c00
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,96 @@
+use std::fs::File;
+use std::option::Option;
+use std::process::*;
+use std::env::home_dir;
+use std::io::*;
+use std::io::ErrorKind::Other;
+
+static LOCAL_CONF_FILE_NAME: &'static str = ".loc.config";
+static GLOBAL_CONF_FILE_NAME: &'static str = "/etc/loc/config";
+
+pub struct CommentTokens {
+	pub file_ending: String,
+	pub single_line: String,
+	pub begin_comment_block: String,
+	pub end_comment_block: String,
+}
+
+pub fn read_config() -> Result<Vec<CommentTokens>>{
+	// first read the local files .loc.config
+	let mut local_error = false;
+	let mut global_error = false;
+	let mut user_error = false;
+	let mut conf: Vec<CommentTokens> = Vec::new();
+
+	match read_config_file(LOCAL_CONF_FILE_NAME, &mut conf) {
+		Ok(_i) => {},
+		Err(_e) => {local_error = true},
+	}
+
+	if let Some(mut x) = home_dir() {
+		x.push(LOCAL_CONF_FILE_NAME);
+		let user_conf_file_name = x.to_str().unwrap();
+
+		match read_config_file(user_conf_file_name, &mut conf) {
+			Ok(_i) => {},
+			Err(_e) => { user_error = true},
+		}
+	}
+
+	match read_config_file(GLOBAL_CONF_FILE_NAME,&mut conf) {
+		Ok(_i) => {},
+		Err(_e) => {global_error= true},
+	}
+
+	// quit programm if could not read any config file
+	if local_error && global_error && user_error {
+		println!("failed to read config files:\n\
+			 {}: \n\
+			 {}:", LOCAL_CONF_FILE_NAME,
+			 		GLOBAL_CONF_FILE_NAME);
+		exit(1);
+	}
+
+	Ok(conf)
+}
+
+fn read_config_file(config_file: &str, conf: &mut Vec<CommentTokens>) -> Result<i32> {
+	let f = try!(File::open(config_file));
+	let bufread = BufReader::new(f);
+
+	for (index, line) in bufread.lines().enumerate() {
+		match parse_config_file_line(&try!(line)) {
+			Ok(conf_tok) => conf.push(conf_tok),
+			Err(e)=> println!("error file {}, line {}: {}", config_file, index+1, e),
+		}
+
+	}
+
+	Ok(10)
+}
+
+fn config_file_line_unwrap_element(elem: Option<&str>) -> Result<String>{
+	match elem {
+		Some(line) => Ok(line.to_string()),
+		None => Err(Error::new(Other, "must have four tokens")),
+	}
+}
+
+fn parse_config_file_line(line: &str) -> Result<CommentTokens>{
+	let mut tokens = line.split_whitespace();
+
+	let conf = CommentTokens {
+		file_ending : try!(config_file_line_unwrap_element(tokens.next())),
+		single_line : try!(config_file_line_unwrap_element(tokens.next())),
+		begin_comment_block : try!(config_file_line_unwrap_element(tokens.next())),
+		end_comment_block : try!(config_file_line_unwrap_element(tokens.next())),
+	};
+
+	// there should not be anymore value otherwise print warning
+	// for wrong config file format
+	if tokens.next() != None {
+		return Err(Error::new(Other, "more than four tokens"));
+	}
+	
+	Ok(conf)
+}