1 files changed, 33 insertions, 2 deletions
diff --git a/rprt-engine/src/buffer.rs b/rprt-engine/src/buffer.rs
index f2c6e0f..ab97c44 100644
--- a/rprt-engine/src/buffer.rs
+++ b/rprt-engine/src/buffer.rs
@@ -4,14 +4,39 @@ use std::process::Command;
 use std::time::{SystemTime, UNIX_EPOCH};
 
 pub type BufferID = usize;
+
+#[derive(Debug)]
+pub enum BufferState {
+    Modified,
+    Unmodified,
+}
+
+#[derive(Debug)]
 pub struct Buffer {
     pub content: String,
     pub name: String,
+    pub state: BufferState,
+    pub read_only: bool,
+    pub ephemeral: bool,
 }
 
 impl Buffer {
     pub fn new(name: String, content: String) -> Self {
-        Self { name, content }
+        Self {
+            name,
+            content,
+            state: BufferState::Unmodified,
+            read_only: false,
+            ephemeral: false,
+        }
+    }
+
+    pub fn max_pos(&self) -> usize {
+        self.content.len()
+    }
+
+    pub fn valid_pos(&self, pos: usize) -> bool {
+        pos <= self.max_pos()
     }
 
     fn generate_shell_name(command: &str) -> String {
@@ -40,6 +65,12 @@ impl Buffer {
             Err(e) => format!("Command failed: {}", e),
         };
 
-        Self { name, content }
+        Self {
+            name,
+            content,
+            read_only: true,
+            state: BufferState::Unmodified,
+            ephemeral: true,
+        }
     }
 }