Format Rust code using rustfmt

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rexec"
-version = "1.0.3"
+version = "1.0.2"
 edition = "2021"
 description = "Parallel SSH executor"
 repository = "https://github.com/house-of-vanity/rexec"

src/main.rs

@@ -77,41 +77,48 @@ fn read_known_hosts() -> Vec<Host> {
     result
 }
 
-fn expand_range(start: i32, end: i32) -> Vec<String> {
-    (start..=end).map(|i| i.to_string()).collect()
-}
-
-fn expand_list(list: &str) -> Vec<String> {
-    list.split(',').map(|s| s.to_string()).collect()
-}
-
-fn expand_string(s: &str) -> Vec<Host> {
+fn expand_string(string: String) -> Vec<Host> {
+    let mut result: Vec<String> = Vec::new();
+    let mut _result: Vec<String> = Vec::new();
     let mut hosts: Vec<Host> = Vec::new();
-    let mut result = vec![s.to_string()];
 
-    while let Some(r) = result.iter().find(|s| s.contains('[')) {
-        let r = r.clone();
-        let start = r.find('[').unwrap();
-        let end = r.find(']').unwrap();
-        let colon = r.find(':').unwrap();
-        let low = r[start + 1..colon].parse::<i32>().unwrap();
-        let high = r[colon + 1..end].parse::<i32>().unwrap();
-        result.retain(|s| s != &r);
-        for val in expand_range(low, high) {
-            let new_str = format!("{}{}{}", &r[..start], val, &r[end + 1..]);
-            result.push(new_str);
+    if let Some(open_bracket_index) = string.find('[') {
+        if let Some(close_bracket_index) = string.find(']') {
+            let prefix = &string[..open_bracket_index];
+            let range = &string[open_bracket_index + 1..close_bracket_index];
+            let postfix = &string[close_bracket_index + 1..];
+
+            let parts: Vec<&str> = range.split(':').collect();
+
+            if parts.len() == 2 {
+                if let Ok(start) = parts[0].parse::<u32>() {
+                    if let Ok(end) = parts[1].parse::<u32>() {
+                        for num in start..=end {
+                            _result.push(format!("{}{}{}", prefix, num, postfix));
                         }
                     }
+                }
+            }
+        }
+    } else {
+        _result.push(String::from(string));
+    }
 
-    while let Some(r) = result.iter().find(|s| s.contains('{')) {
-        let r = r.clone();
-        let start = r.find('{').unwrap();
-        let end = r.find('}').unwrap();
-        let list = &r[start + 1..end];
-        result.retain(|s| s != &r);
-        for val in expand_list(list) {
-            let new_str = format!("{}{}{}", &r[..start], val, &r[end + 1..]);
-            result.push(new_str);
+    for string in _result {
+        if let Some(open_brace_index) = string.find('{') {
+            if let Some(close_brace_index) = string.find('}') {
+                let prefix = &string[..open_brace_index];
+                let list = &string[open_brace_index + 1..close_brace_index];
+                let postfix = &string[close_brace_index + 1..];
+
+                let items: Vec<&str> = list.split(',').collect();
+
+                for item in items {
+                    result.push(format!("{}{}{}", prefix, item, postfix));
+                }
+            }
+        } else {
+            result.push(String::from(string));
         }
     }
 
@@ -149,7 +156,7 @@ fn main() {
             .collect()
     } else {
         info!("Using string expansion to build server list.");
-        expand_string(&args.expression)
+        expand_string(args.expression)
     };
 
     // Dedup hosts from known_hosts file