Add check flag to the setup subcommand

* The check option communicates default and config options to the user
  as well as optional compile time features

* Move generate-completion from a subcommand to a flag in the setup
  subcommand

src/cli.rs

@@ -1,5 +1,6 @@
 use super::common::utils::consts::{ZELLIJ_CONFIG_DIR_ENV, ZELLIJ_CONFIG_FILE_ENV};
 use crate::common::input::options::Options;
+use crate::common::setup::Setup;
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 use structopt::StructOpt;
@@ -40,17 +41,7 @@ pub enum ConfigCli {
     #[structopt(name = "options")]
     Options(Options),
 
-    #[structopt(name = "generate-completion")]
+    /// Setup zellij and check its configuration
-    GenerateCompletion { shell: String },
-
     #[structopt(name = "setup")]
-    Setup {
+    Setup(Setup),
-        /// Dump the default configuration file to stdout
-        #[structopt(long)]
-        dump_config: bool,
-        /// Disables loading of configuration file at default location,
-        /// loads the defaults that zellij ships with
-        #[structopt(long)]
-        clean: bool,
-    },
 }

src/common/input/config.rs

@@ -60,8 +60,8 @@ impl TryFrom<&CliArgs> for Config {
             return Config::new(&path);
         }
 
-        if let Some(ConfigCli::Setup { clean, .. }) = opts.option {
+        if let Some(ConfigCli::Setup(setup)) = opts.option.clone() {
-            if clean {
+            if setup.clean {
                 return Config::from_default_assets();
             }
         }
@@ -177,11 +177,12 @@ mod config_test {
 
     #[test]
     fn try_from_cli_args_with_option_clean() {
+        use crate::common::setup::Setup;
         let mut opts = CliArgs::default();
-        opts.option = Some(ConfigCli::Setup {
+        opts.option = Some(ConfigCli::Setup(Setup {
             clean: true,
-            dump_config: false,
+            ..Setup::default()
-        });
+        }));
         let result = Config::try_from(&opts);
         assert!(result.is_ok());
     }

src/common/setup.rs

@@ -1,12 +1,17 @@
+use crate::cli::CliArgs;
 use crate::common::utils::consts::{
-    SYSTEM_DEFAULT_CONFIG_DIR, SYSTEM_DEFAULT_DATA_DIR_PREFIX, VERSION, ZELLIJ_PROJ_DIR,
+    FEATURES, SYSTEM_DEFAULT_CONFIG_DIR, SYSTEM_DEFAULT_DATA_DIR_PREFIX, VERSION, ZELLIJ_PROJ_DIR,
 };
 use crate::os_input_output::set_permissions;
 use directories_next::BaseDirs;
+use serde::{Deserialize, Serialize};
 use std::io::Write;
 use std::{fs, path::Path, path::PathBuf};
+use structopt::StructOpt;
 
 const CONFIG_LOCATION: &str = ".config/zellij";
+const CONFIG_NAME: &str = "config.yaml";
+static ARROW_SEPARATOR: &str = "";
 
 #[macro_export]
 macro_rules! asset_map {
@@ -56,11 +61,7 @@ pub mod install {
 /// Goes through a predefined list and checks for an already
 /// existing config directory, returns the first match
 pub fn find_default_config_dir() -> Option<PathBuf> {
-    vec![
+    default_config_dirs()
-        home_config_dir(),
-        Some(xdg_config_dir()),
-        Some(Path::new(SYSTEM_DEFAULT_CONFIG_DIR).to_path_buf()),
-    ]
         .into_iter()
         .filter(|p| p.is_some())
         .find(|p| p.clone().unwrap().exists())
@@ -72,6 +73,15 @@ pub fn find_default_config_dir() -> Option<PathBuf> {
     None
 }
 
+/// Order in which config directories are checked
+fn default_config_dirs() -> Vec<Option<PathBuf>> {
+    vec![
+        home_config_dir(),
+        Some(xdg_config_dir()),
+        Some(Path::new(SYSTEM_DEFAULT_CONFIG_DIR).to_path_buf()),
+    ]
+}
+
 /// Looks for an existing dir, uses that, else returns a
 /// dir matching the config spec.
 pub fn get_default_data_dir() -> PathBuf {
@@ -115,3 +125,116 @@ pub const DEFAULT_CONFIG: &[u8] = include_bytes!(concat!(
 pub fn dump_default_config() -> std::io::Result<()> {
     dump_asset(DEFAULT_CONFIG)
 }
+
+#[derive(Debug, Default, Clone, StructOpt, Serialize, Deserialize)]
+pub struct Setup {
+    /// Dump the default configuration file to stdout
+    #[structopt(long)]
+    pub dump_config: bool,
+    /// Disables loading of configuration file at default location,
+    /// loads the defaults that zellij ships with
+    #[structopt(long)]
+    pub clean: bool,
+    /// Checks the configuration of zellij and displays
+    /// currently used directories
+    #[structopt(long)]
+    pub check: bool,
+
+    #[structopt(long)]
+    pub generate_completion: Option<String>,
+}
+
+impl Setup {
+    /// Entrypoint from main
+    pub fn from_cli(&self, opts: CliArgs) -> std::io::Result<()> {
+        if self.dump_config {
+            dump_default_config()?;
+        }
+
+        if self.check {
+            Setup::check_defaults_config(opts)?;
+        }
+
+        if let Some(shell) = &self.generate_completion {
+            Self::generate_completion(shell.into());
+        }
+
+        Ok(())
+    }
+
+    pub fn check_defaults_config(opts: CliArgs) -> std::io::Result<()> {
+        let data_dir = opts.data_dir.unwrap_or_else(get_default_data_dir);
+        let config_dir = opts.config_dir.or_else(find_default_config_dir);
+        let plugin_dir = data_dir.join("plugins");
+        let layout_dir = data_dir.join("layouts");
+        let system_data_dir = PathBuf::from(SYSTEM_DEFAULT_DATA_DIR_PREFIX).join("share/zellij");
+        let config_file = opts
+            .config
+            .or_else(|| config_dir.clone().map(|p| p.join(CONFIG_NAME)));
+
+        let mut message = String::new();
+
+        message.push_str(&format!("[Version]: {:?}\n", VERSION));
+        if let Some(config_dir) = config_dir {
+            message.push_str(&format!("[CONFIG DIR]: {:?}\n", config_dir));
+        } else {
+            message.push_str(&"[CONFIG DIR]: Not Found\n");
+            let mut default_config_dirs = default_config_dirs()
+                .iter()
+                .filter_map(|p| p.clone())
+                .collect::<Vec<PathBuf>>();
+            default_config_dirs.dedup();
+            message.push_str(
+                &" On your system zellij looks in the following config directories by default:\n",
+            );
+            for dir in default_config_dirs {
+                message.push_str(&format!(" {:?}\n", dir));
+            }
+        }
+        if let Some(config_file) = config_file {
+            use crate::common::input::config::Config;
+            message.push_str(&format!("[CONFIG FILE]: {:?}\n", config_file));
+            match Config::new(&config_file) {
+                Ok(_) => message.push_str(&"[CONFIG FILE]: Well defined.\n"),
+                Err(e) => message.push_str(&format!("[CONFIG ERROR]: {}\n", e)),
+            }
+        } else {
+            message.push_str(&"[CONFIG FILE]: Not Found\n");
+            message.push_str(&format!(
+                " By default zellij looks for a file called [{}] in the configuration directory\n",
+                CONFIG_NAME
+            ));
+        }
+        message.push_str(&format!("[DATA DIR]: {:?}\n", data_dir));
+        message.push_str(&format!("[PLUGIN DIR]: {:?}\n", plugin_dir));
+        message.push_str(&format!("[LAYOUT DIR]: {:?}\n", layout_dir));
+        message.push_str(&format!("[SYSTEM DATA DIR]: {:?}\n", system_data_dir));
+
+        message.push_str(&format!("[ARROW SEPARATOR]: {}\n", ARROW_SEPARATOR));
+        message.push_str(&" Is the [ARROW_SEPARATOR] displayed correctly?\n");
+        message.push_str(&" If not you may want to either start zellij with a compatible mode 'zellij options --simple-ui'\n");
+        message.push_str(&" Or check the font that is in use:\n https://zellij.dev/documentation/compatibility.html#the-status-bar-fonts-dont-render-correctly\n");
+
+        message.push_str(&format!("[FEATURES]: {:?}\n", FEATURES));
+        message.push_str(&"[DOCUMENTATION]: zellij.dev/documentation/\n");
+
+        std::io::stdout().write_all(message.as_bytes())?;
+
+        Ok(())
+    }
+    fn generate_completion(shell: String) {
+        let shell = match shell.as_ref() {
+            "bash" => structopt::clap::Shell::Bash,
+            "fish" => structopt::clap::Shell::Fish,
+            "zsh" => structopt::clap::Shell::Zsh,
+            "powerShell" => structopt::clap::Shell::PowerShell,
+            "elvish" => structopt::clap::Shell::Elvish,
+            other => {
+                eprintln!("Unsupported shell: {}", other);
+                std::process::exit(1);
+            }
+        };
+        let mut out = std::io::stdout();
+        CliArgs::clap().gen_completions_to("zellij", shell, &mut out);
+    }
+}

src/common/utils/consts.rs

@@ -47,3 +47,8 @@ lazy_static! {
     pub static ref ZELLIJ_TMP_LOG_DIR: PathBuf = ZELLIJ_TMP_DIR.join("zellij-log");
     pub static ref ZELLIJ_TMP_LOG_FILE: PathBuf = ZELLIJ_TMP_LOG_DIR.join("log.txt");
 }
+
+pub const FEATURES: &[&str] = &[
+    #[cfg(feature = "enable_automatic_asset_installation")]
+    "enable_automatic_asset_installation",
+];

src/main.rs

@@ -6,7 +6,9 @@ mod server;
 mod tests;
 
 use client::{boundaries, layout, panes, start_client, tab};
-use common::{command_is_executing, errors, os_input_output, pty, screen, setup, utils, wasm_vm};
+use common::{
+    command_is_executing, errors, os_input_output, pty, screen, setup::Setup, utils, wasm_vm,
+};
 use server::start_server;
 use structopt::StructOpt;
 
@@ -22,6 +24,11 @@ use std::convert::TryFrom;
 
 pub fn main() {
     let opts = CliArgs::from_args();
+
+    if let Some(crate::cli::ConfigCli::Setup(setup)) = opts.option.clone() {
+        Setup::from_cli(&setup, opts).expect("Failed to print to stdout");
+        std::process::exit(0);
+    } else {
         let config = match Config::try_from(&opts) {
             Ok(config) => config,
             Err(e) => {
@@ -30,25 +37,6 @@ pub fn main() {
             }
         };
         let config_options = Options::from_cli(&config.options, opts.option.clone());
-
-    if let Some(crate::cli::ConfigCli::GenerateCompletion { shell }) = opts.option {
-        let shell = match shell.as_ref() {
-            "bash" => structopt::clap::Shell::Bash,
-            "fish" => structopt::clap::Shell::Fish,
-            "zsh" => structopt::clap::Shell::Zsh,
-            "powerShell" => structopt::clap::Shell::PowerShell,
-            "elvish" => structopt::clap::Shell::Elvish,
-            other => {
-                eprintln!("Unsupported shell: {}", other);
-                std::process::exit(1);
-            }
-        };
-        let mut out = std::io::stdout();
-        CliArgs::clap().gen_completions_to("zellij", shell, &mut out);
-    } else if let Some(crate::cli::ConfigCli::Setup { .. }) = opts.option {
-        setup::dump_default_config().expect("Failed to print to stdout");
-        std::process::exit(0);
-    } else {
         atomic_create_dir(&*ZELLIJ_TMP_DIR).unwrap();
         atomic_create_dir(&*ZELLIJ_TMP_LOG_DIR).unwrap();
         let server_os_input = get_server_os_input();