add default page size config (#96)

src/config/model.rs

@@ -8,6 +8,8 @@ use crate::output::utils::run_cmd;
 
 error_chain! {}
 
+const DEFAULT_PAGE_SIZE: usize = 10;
+
 // Account
 
 #[derive(Debug, Deserialize)]
@@ -17,6 +19,7 @@ pub struct Account {
     pub name: Option<String>,
     pub downloads_dir: Option<PathBuf>,
     pub signature: Option<String>,
+    pub default_page_size: Option<usize>,
 
     // Specific
     pub default: Option<bool>,
@@ -94,6 +97,7 @@ pub struct Config {
     pub downloads_dir: Option<PathBuf>,
     pub notify_cmd: Option<String>,
     pub signature: Option<String>,
+    pub default_page_size: Option<usize>,
 
     #[serde(flatten)]
     pub accounts: HashMap<String, Account>,
@@ -193,4 +197,14 @@ impl Config {
             .or_else(|| self.signature.as_ref())
             .map(|sig| sig.to_owned())
     }
+
+    pub fn default_page_size(&self, account: &Account) -> usize {
+        account
+            .default_page_size
+            .as_ref()
+            .or_else(|| self.default_page_size.as_ref())
+            .or(Some(&DEFAULT_PAGE_SIZE))
+            .unwrap()
+            .to_owned()
+    }
 }