format: remove extra spaces from error output

README.md

@@ -34,9 +34,10 @@ Syntax of a rule file (placed under [rules](./rules)):
 # this field should be the name of the command
 command = "world"
 
-# you can add as much section of this as you like
-[[match_output]]
-# the suggestion of this section will be used for the following patterns of the command output
+# you can add as many `[[match_err]]` section as you want
+[[match_err]]
+# the suggestion of this section will be used for the following patterns of the error output
+# note that the error is formatted to lowercase without extra spaces
 pattern = [
 	"pattern 1",
 	"pattern 2",
@@ -44,7 +45,7 @@ pattern = [
 # this will change the first argument to `fix`, while keeping the rest intact
 suggest = "{{command[0]}} fix {{command[2:]}}"
 
-[[match_output]]
+[[match_err]]
 pattern = [
 	"pattern 1",
 ]
@@ -68,6 +69,8 @@ The suggestion can have additional conditions to check. To specify the condition
 - `cmd_contains`: Check if the last user input contains the argument
 - `err_contains`: Check if the error of the command contains the argument
 
+
+
 ## Current Progress
 
 We need more rule files!

rule_parser/src/lib.rs

@@ -49,7 +49,11 @@ fn gen_string_hashmap(rules: Vec<Rule>) -> String {
 				.iter()
 				.map(|x| x.to_lowercase())
 				.collect::<Vec<String>>();
-			let suggest = match_err.suggest;
+			let suggest = match_err.
+				suggest
+				.iter()
+				.map(|x| x.to_lowercase())
+				.collect::<Vec<String>>();
 			string_hashmap.push_str(&format!(
 				"(vec![\"{}\"], vec![\"{}\"]),",
 				pattern.join("\", \""),

src/shell.rs

@@ -61,6 +61,9 @@ pub fn command_output(shell: &str, command: &str) -> String {
 
 	String::from_utf8_lossy(&output.stderr)
 		.to_string()
+		.split_whitespace()
+		.collect::<Vec<&str>>()
+		.join(" ")
 		.to_lowercase()
 }