add: client display position setup

src/client.rs

@@ -1,5 +1,5 @@
 use std::collections::HashMap;
-use std::io::{Error, ErrorKind::*, Read, Write};
+use std::io::{stdout, Error, ErrorKind::*, Read, Write};
 use std::{fs, net::TcpStream};
 use std::{mem, u32};
 
@@ -75,10 +75,143 @@ impl Client {
         Ok(())
     }
 
-    fn set_display_position(&mut self, previous: Vec<Display>) {
-        let mut disp = &self.displays;
+    fn set_display_position(&mut self, server_conf: Vec<Display>) {
+        let displays = &mut self.displays;
+
+        let file = config_dir!("client").join("client_config.json");
+
+        if file.exists() {
+            let json = match fs::read_to_string(file) {
+                Ok(json) => json,
+                Err(_) => {
+                    eprint!("[WRN] invalid client_config.json");
+                    return prompt_display_position(displays, server_conf);
+                }
+            };
+
+            let config: Vec<Display> = match serde_json::from_str(&json) {
+                Ok(vec) => vec,
+                Err(_) => {
+                    eprint!("[WRN] invalid client_config.json");
+                    return prompt_display_position(displays, server_conf);
+                }
+            };
+
+            /* check all displays in config are correct */
+            let mut cnt = 0;
+
+            for disp in displays.iter() {
+                for conf in config.iter() {
+                    // the only param that could identify displays
+                    if disp.name == conf.name {
+                        cnt += 1;
+                        continue;
+                    }
+                }
+            }
+
+            if cnt != displays.len() {
+                eprint!("[WRN] client_config.json does not match with current system displays");
+                return prompt_display_position(displays, server_conf);
+            }
+
+            /* set positions with config; misconfigurations will be checked in the server */
+            for disp in displays.iter_mut() {
+                for conf in config.iter() {
+                    if disp.name == conf.name {
+                        disp.x = conf.x;
+                        disp.y = conf.y;
+                        continue;
+                    }
+                }
+            }
+        } else {
+            // config not exists
+            return prompt_display_position(displays, server_conf);
+        }
+    }
+}
+
+fn prompt_display_position(displays: &mut Vec<Display>, server_conf: Vec<Display>) {
+    println!("\n########## display position setup ##########");
+    println!("[INF] current server displays:");
+
+    for (i, d) in server_conf.iter().enumerate() {
+        println!(
+            "  [{:2}] x: {:4}, y: {:4}, width: {:4}, height: {:4}",
+            i, d.x, d.y, d.width, d.height
+        );
+    }
+
+    println!("\n[INF] please enter the attach position of the each display");
+    println!("[INF] (x, y) is the coordinate of the upper left corner of the display");
+
+    let mut i = 0;
+    let tot = displays.len();
 
-        // ! TODO
+    while i < tot {
+        let d = displays.get_mut(i).unwrap();
+        println!(
+            "[{:2}/{}] {} - width: {:4}, height: {:4}",
+            i, tot, d.name, d.width, d.height
+        );
+
+        print!("  x coordinate: ");
+        stdout().flush().unwrap();
+
+        match stdin_i32() {
+            Ok(x) => d.x = x,
+            Err(_) => {
+                eprintln!("  [ERR] invalid input");
+                continue;
+            }
+        }
+
+        print!("  y coordinate: ");
+        stdout().flush().unwrap();
+
+        match stdin_i32() {
+            Ok(y) => d.y = y,
+            Err(_) => {
+                eprintln!("  [ERR] invalid input");
+                continue;
+            }
+        }
+
+        // confirm input
+        loop {
+            print!(
+                "[CONFIRM] {} - x: {}, y: {}, width: {:4}, height: {:4} [y/n/p]: ",
+                d.name, d.x, d.y, d.width, d.height
+            );
+            stdout().flush().unwrap();
+
+            let ch = match stdin_char() {
+                Ok(ch) => ch,
+                Err(_) => {
+                    continue;
+                }
+            };
+
+            match ch {
+                'y' => {
+                    i += 1; // next display
+                    break;
+                }
+                'n' => {
+                    break; // current display again
+                }
+                'p' => {
+                    if i > 0 {
+                        i -= 1; // previous display
+                    }
+                    break;
+                }
+                _ => {
+                    continue;
+                }
+            }
+        }
     }
 }
 

src/utils.rs

@@ -1,3 +1,6 @@
+use std::io::stdin;
+use std::io::{Error, ErrorKind::*};
+
 use display_info::DisplayInfo;
 use serde::{Deserialize, Serialize};
 
@@ -15,6 +18,36 @@ pub fn print_displays() {
     }
 }
 
+pub fn stdin_i32() -> Result<i32, Error> {
+    let mut input = String::new();
+
+    if let Err(_) = stdin().read_line(&mut input) {
+        return Err(Error::new(InvalidInput, "stdin read failure"));
+    };
+
+    match input.trim().parse() {
+        Ok(i) => Ok(i),
+        Err(_) => {
+            return Err(Error::new(InvalidInput, "invalid input"));
+        }
+    }
+}
+
+pub fn stdin_char() -> Result<char, Error> {
+    let mut input = String::new();
+
+    if let Err(_) = stdin().read_line(&mut input) {
+        return Err(Error::new(InvalidInput, "stdin read failure"));
+    };
+
+    match input.trim().parse() {
+        Ok(i) => Ok(i),
+        Err(_) => {
+            return Err(Error::new(InvalidInput, "invalid input"));
+        }
+    }
+}
+
 #[macro_export]
 macro_rules! config_dir {
     ($subpath: expr) => {{
@@ -23,7 +56,8 @@ macro_rules! config_dir {
         ProjectDirs::from("", "luftaquila", "transistor")
             .unwrap()
             .data_local_dir()
-            .to_path_buf().join($subpath)
+            .to_path_buf()
+            .join($subpath)
     }};
 }