Add read-only mode

Ref: https://github.com/sayanarijit/xplr/issues/22

src/app.rs

@@ -1617,13 +1617,21 @@ impl App {
     }
 
     fn call(mut self, command: Command) -> Result<Self> {
-        self.msg_out.push_back(MsgOut::Call(command));
-        Ok(self)
+        if self.config.general.read_only.unwrap_or_default() {
+            self.log_error("Cannot call command in read-only mode.".into())
+        } else {
+            self.msg_out.push_back(MsgOut::Call(command));
+            Ok(self)
+        }
     }
 
     fn call_silently(mut self, command: Command) -> Result<Self> {
-        self.msg_out.push_back(MsgOut::CallSilently(command));
-        Ok(self)
+        if self.config.general.read_only.unwrap_or_default() {
+            self.log_error("Cannot call command in read-only mode.".into())
+        } else {
+            self.msg_out.push_back(MsgOut::CallSilently(command));
+            Ok(self)
+        }
     }
 
     fn bash_exec(self, script: String) -> Result<Self> {

src/config.rs

@@ -280,6 +280,9 @@ pub struct GeneralConfig {
     #[serde(default)]
     pub show_hidden: Option<bool>,
 
+    #[serde(default)]
+    pub read_only: Option<bool>,
+
     #[serde(default)]
     pub cursor: UiElement,
 
@@ -311,6 +314,7 @@ pub struct GeneralConfig {
 impl GeneralConfig {
     pub fn extend(mut self, other: Self) -> Self {
         self.show_hidden = other.show_hidden.or(self.show_hidden);
+        self.read_only = other.read_only.or(self.read_only);
         self.cursor = self.cursor.extend(other.cursor);
         self.prompt = self.prompt.extend(other.prompt);
         self.logs = self.logs.extend(other.logs);

src/config.yml

@@ -1,6 +1,7 @@
 version: v0.5.0
 general:
   show_hidden: false
+  read_only: false
   initial_sorting:
     - sorter: ByCanonicalIsDir
       reverse: true