fix(plugins): respect default shell when configured in the $SHELL env…

… variable (#3296)

* fix(plugins): respect $SHELL alias for default shell

* style(fmt): rustfmt

* fix tests

zellij-server/src/plugins/unit/snapshots/zellij_server__plugins__plugin_tests__open_terminal_floating_plugin_command.snap

@@ -1,14 +1,14 @@
 ---
 source: zellij-server/src/plugins/./unit/plugin_tests.rs
-assertion_line: 4246
+assertion_line: 4390
 expression: "format!(\"{:#?}\", new_tab_event)"
 ---
 Some(
     SpawnTerminal(
         Some(
             RunCommand(
                 RunCommand {
-                    command: "",
+                    command: ".",
                     args: [],
                     cwd: Some(
                         "/path/to/my/file.rs",

zellij-server/src/plugins/unit/snapshots/zellij_server__plugins__plugin_tests__open_terminal_plugin_command.snap

@@ -1,14 +1,14 @@
 ---
 source: zellij-server/src/plugins/./unit/plugin_tests.rs
-assertion_line: 4169
+assertion_line: 4312
 expression: "format!(\"{:#?}\", new_tab_event)"
 ---
 Some(
     SpawnTerminal(
         Some(
             RunCommand(
                 RunCommand {
-                    command: "",
+                    command: ".",
                     args: [],
                     cwd: Some(
                         "/path/to/my/file.rs",

zellij-server/src/plugins/zellij_exports.rs

@@ -515,11 +515,12 @@ fn open_file_in_place(env: &ForeignFunctionEnv, file_to_open: FileToOpen) {
 fn open_terminal(env: &ForeignFunctionEnv, cwd: PathBuf) {
     let error_msg = || format!("failed to open file in plugin {}", env.plugin_env.name());
     let cwd = env.plugin_env.plugin_cwd.join(cwd);
-    let mut default_shell = env
-        .plugin_env
-        .default_shell
-        .clone()
-        .unwrap_or_else(|| TerminalAction::RunCommand(RunCommand::default()));
+    let mut default_shell = env.plugin_env.default_shell.clone().unwrap_or_else(|| {
+        TerminalAction::RunCommand(RunCommand {
+            command: env.plugin_env.path_to_default_shell.clone(),
+            ..Default::default()
+        })
+    });
     default_shell.change_cwd(cwd);
     let run_command_action: Option<RunCommandAction> = match default_shell {
         TerminalAction::RunCommand(run_command) => Some(run_command.into()),
@@ -536,11 +537,12 @@ fn open_terminal_floating(
 ) {
     let error_msg = || format!("failed to open file in plugin {}", env.plugin_env.name());
     let cwd = env.plugin_env.plugin_cwd.join(cwd);
-    let mut default_shell = env
-        .plugin_env
-        .default_shell
-        .clone()
-        .unwrap_or_else(|| TerminalAction::RunCommand(RunCommand::default()));
+    let mut default_shell = env.plugin_env.default_shell.clone().unwrap_or_else(|| {
+        TerminalAction::RunCommand(RunCommand {
+            command: env.plugin_env.path_to_default_shell.clone(),
+            ..Default::default()
+        })
+    });
     default_shell.change_cwd(cwd);
     let run_command_action: Option<RunCommandAction> = match default_shell {
         TerminalAction::RunCommand(run_command) => Some(run_command.into()),
@@ -553,11 +555,12 @@ fn open_terminal_floating(
 fn open_terminal_in_place(env: &ForeignFunctionEnv, cwd: PathBuf) {
     let error_msg = || format!("failed to open file in plugin {}", env.plugin_env.name());
     let cwd = env.plugin_env.plugin_cwd.join(cwd);
-    let mut default_shell = env
-        .plugin_env
-        .default_shell
-        .clone()
-        .unwrap_or_else(|| TerminalAction::RunCommand(RunCommand::default()));
+    let mut default_shell = env.plugin_env.default_shell.clone().unwrap_or_else(|| {
+        TerminalAction::RunCommand(RunCommand {
+            command: env.plugin_env.path_to_default_shell.clone(),
+            ..Default::default()
+        })
+    });
     default_shell.change_cwd(cwd);
     let run_command_action: Option<RunCommandAction> = match default_shell {
         TerminalAction::RunCommand(run_command) => Some(run_command.into()),