introduce signature feature

src/config/model.rs

@@ -16,6 +16,7 @@ pub struct Account {
     // Override
     pub name: Option<String>,
     pub downloads_dir: Option<PathBuf>,
+    pub signature: Option<String>,
 
     // Specific
     pub default: Option<bool>,
@@ -76,6 +77,7 @@ pub struct Config {
     pub name: String,
     pub downloads_dir: Option<PathBuf>,
     pub notify_cmd: Option<String>,
+    pub signature: Option<String>,
 
     #[serde(flatten)]
     pub accounts: HashMap<String, Account>,
@@ -170,4 +172,12 @@ impl Config {
 
         Ok(())
     }
+
+    pub fn signature(&self, account: &Account) -> Option<String> {
+        account
+            .signature
+            .as_ref()
+            .or_else(|| self.signature.as_ref())
+            .map(|sig| sig.to_owned())
+    }
 }

src/msg/model.rs

@@ -360,6 +360,18 @@ impl<'m> Msg<'m> {
         // "Subject" header
         tpl.push("Subject: ".to_string());
 
+        // Separator between headers and body
+        tpl.push(String::new());
+
+        // Signature
+        if let Some(sig) = config.signature(&account) {
+            tpl.push(String::new());
+            tpl.push("--".to_string());
+            for line in sig.split("\n") {
+                tpl.push(line.to_string());
+            }
+        }
+
         Ok(Tpl(tpl.join("\r\n")))
     }
 
@@ -404,6 +416,15 @@ impl<'m> Msg<'m> {
             .join("\r\n");
         tpl.push(thread);
 
+        // Signature
+        if let Some(sig) = config.signature(&account) {
+            tpl.push(String::new());
+            tpl.push("--".to_string());
+            for line in sig.split("\n") {
+                tpl.push(line.to_string());
+            }
+        }
+
         Ok(Tpl(tpl.join("\r\n")))
     }
 
@@ -489,6 +510,15 @@ impl<'m> Msg<'m> {
             .join("\r\n");
         tpl.push(thread);
 
+        // Signature
+        if let Some(sig) = config.signature(&account) {
+            tpl.push(String::new());
+            tpl.push("--".to_string());
+            for line in sig.split("\n") {
+                tpl.push(line.to_string());
+            }
+        }
+
         Ok(Tpl(tpl.join("\r\n")))
     }
 
@@ -518,6 +548,15 @@ impl<'m> Msg<'m> {
         tpl.push("-------- Forwarded Message --------".to_string());
         tpl.push(self.text_bodies("text/plain")?);
 
+        // Signature
+        if let Some(sig) = config.signature(&account) {
+            tpl.push(String::new());
+            tpl.push("--".to_string());
+            for line in sig.split("\n") {
+                tpl.push(line.to_string());
+            }
+        }
+
         Ok(Tpl(tpl.join("\r\n")))
     }
 }