feat: add initial session name to layout template (#789)

* feat: add session configuration to layout template

WIP: prototyping for issue #611

* test(layout): add session name

* feat(layout): add cond flow to check session name

* feat(layout): update session

* feat: add function to attach a session

* fix(layout): update feedback

* attach option only works when layout template exists.

* feat(layout): add conditional for session-layout

* update default attach value

3 files changed, 42 insertions, 0 deletions

diff --git a/zellij-utils/src/input/layout.rs b/zellij-utils/src/input/layout.rs
index 2bbc8cb48..df976b8e1 100644
--- a/zellij-utils/src/input/layout.rs
+++ b/zellij-utils/src/input/layout.rs
@@ -144,6 +144,8 @@ pub struct Layout {
 #[serde(default)]
 pub struct LayoutFromYaml {
     #[serde(default)]
+    pub session: SessionFromYaml,
+    #[serde(default)]
     pub template: LayoutTemplate,
     #[serde(default)]
     pub borderless: bool,
@@ -245,6 +247,20 @@ impl LayoutFromYaml {
     }
 }
 
+// The struct that is used to deserialize the session from
+// a yaml configuration file
+#[derive(Debug, Default, Serialize, Deserialize, Clone, PartialEq)]
+#[serde(crate = "self::serde")]
+pub struct SessionFromYaml {
+    pub name: Option<String>,
+    #[serde(default = "default_as_some_true")]
+    pub attach: Option<bool>,
+}
+
+fn default_as_some_true() -> Option<bool> {
+    Some(true)
+}
+
 // The struct that carries the information template that is used to
 // construct the layout
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
@@ -591,6 +607,7 @@ impl Default for LayoutTemplate {
 impl Default for LayoutFromYaml {
     fn default() -> Self {
         Self {
+            session: SessionFromYaml::default(),
             template: LayoutTemplate::default(),
             borderless: false,
             tabs: vec![],
diff --git a/zellij-utils/src/input/unit/fixtures/layouts/session-name-to-layout.yaml b/zellij-utils/src/input/unit/fixtures/layouts/session-name-to-layout.yaml
new file mode 100644
index 000000000..144d555b9
--- /dev/null
+++ b/zellij-utils/src/input/unit/fixtures/layouts/session-name-to-layout.yaml
@@ -0,0 +1,3 @@
+---
+session:
+  name: "zellij-session"
diff --git a/zellij-utils/src/input/unit/layout_test.rs b/zellij-utils/src/input/unit/layout_test.rs
index dc8969251..2ec66a2a0 100644
--- a/zellij-utils/src/input/unit/layout_test.rs
+++ b/zellij-utils/src/input/unit/layout_test.rs
@@ -719,3 +719,25 @@ fn no_layout_template_merged_correctly() {
 
     assert_eq!(merged_layout, tab_layout.try_into().unwrap());
 }
+
+#[test]
+fn session_name_to_layout_is_ok() {
+    let path = layout_test_dir("session-name-to-layout.yaml".into());
+    let layout_from_yaml = LayoutFromYaml::new(&path);
+    assert!(layout_from_yaml.is_ok());
+}
+
+#[test]
+fn session_name_to_layout_has_name() {
+    let path = layout_test_dir("session-name-to-layout.yaml".into());
+    let layout_from_yaml = LayoutFromYaml::new(&path);
+    let layout_template = layout_from_yaml.unwrap();
+    let session_layout = layout_template.session;
+
+    let expected_session = SessionFromYaml {
+        name: Some(String::from("zellij-session")),
+        attach: Some(true),
+    };
+
+    assert_eq!(expected_session, session_layout);
+}