chore(deps): update arg parsing to clap v3 (#1017)

* Update arg parsing to clap v3
* Ignore shell argument case

9 files changed, 142 insertions, 127 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 2294d6550..41959027c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -28,15 +28,6 @@ dependencies = [
 
 [[package]]
 name = "ansi_term"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
-dependencies = [
- "winapi",
-]
-
-[[package]]
-name = "ansi_term"
 version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
@@ -338,17 +329,41 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "2.33.3"
+version = "3.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
+checksum = "7a30c3bf9ff12dfe5dae53f0a96e0febcd18420d1c0e7fad77796d9d5c4b5375"
 dependencies = [
- "ansi_term 0.11.0",
  "atty",
  "bitflags",
- "strsim 0.8.0",
+ "clap_derive",
+ "indexmap",
+ "lazy_static",
+ "os_str_bytes",
+ "strsim",
+ "termcolor",
  "textwrap",
- "unicode-width",
- "vec_map",
+]
+
+[[package]]
+name = "clap_complete"
+version = "3.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d044e9db8cd0f68191becdeb5246b7462e4cf0c069b19ae00d1bf3fa9889498d"
+dependencies = [
+ "clap",
+]
+
+[[package]]
+name = "clap_derive"
+version = "3.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "517358c28fcef6607bf6f76108e02afad7e82297d132a6b846dcc1fc3efcd153"
+dependencies = [
+ "heck 0.4.0",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
@@ -603,7 +618,7 @@ dependencies = [
  "ident_case",
  "proc-macro2",
  "quote",
- "strsim 0.10.0",
+ "strsim",
  "syn",
 ]
 
@@ -981,6 +996,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "heck"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2540771e65fc8cb83cd6e8a237f70c319bd5c29f78ed1084ba5d50eeac86f7f9"
+
+[[package]]
 name = "hermit-abi"
 version = "0.1.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1259,9 +1280,9 @@ checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
 
 [[package]]
 name = "memchr"
-version = "2.3.4"
+version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
+checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
 
 [[package]]
 name = "memmap2"
@@ -1439,6 +1460,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "os_str_bytes"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
 name = "parking"
 version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2030,7 +2060,7 @@ checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 name = "status-bar"
 version = "0.1.0"
 dependencies = [
- "ansi_term 0.12.1",
+ "ansi_term",
  "colored",
  "lazy_static",
  "rand 0.8.4",
@@ -2061,41 +2091,11 @@ dependencies = [
 
 [[package]]
 name = "strsim"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
-
-[[package]]
-name = "strsim"
 version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
-name = "structopt"
-version = "0.3.25"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "40b9788f4202aa75c240ecc9c15c65185e6a39ccdeb0fd5d008b98825464c87c"
-dependencies = [
- "clap",
- "lazy_static",
- "structopt-derive",
-]
-
-[[package]]
-name = "structopt-derive"
-version = "0.4.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcb5ae327f9cc13b68763b5749770cb9e048a99bd9dfdfa58d0cf05d5f64afe0"
-dependencies = [
- "heck",
- "proc-macro-error",
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
 name = "strum"
 version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2107,7 +2107,7 @@ version = "0.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ee8bc6b87a5112aeeab1f4a9f7ab634fe6cbefc4850006df31267f4cfb9e3149"
 dependencies = [
- "heck",
+ "heck 0.3.3",
  "proc-macro2",
  "quote",
  "syn",
@@ -2152,7 +2152,7 @@ dependencies = [
 name = "tab-bar"
 version = "0.1.0"
 dependencies = [
- "ansi_term 0.12.1",
+ "ansi_term",
  "colored",
  "unicode-width",
  "zellij-tile",
@@ -2180,6 +2180,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "termcolor"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dfed899f0eb03f32ee8c6a0aabdb8a7949659e3466561fc0adf54e26d88c5f4"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
 name = "terminal_size"
 version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2216,12 +2225,9 @@ dependencies = [
 
 [[package]]
 name = "textwrap"
-version = "0.11.0"
+version = "0.14.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
-dependencies = [
- "unicode-width",
-]
+checksum = "0066c8d12af8b5acd21e00547c3797fde4e8677254a7ee429176ccebbe93dd80"
 
 [[package]]
 name = "thiserror"
@@ -2436,12 +2442,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
 [[package]]
-name = "vec_map"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
-
-[[package]]
 name = "version_check"
 version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2817,6 +2817,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
 [[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2864,7 +2873,7 @@ dependencies = [
 name = "zellij-server"
 version = "0.25.0"
 dependencies = [
- "ansi_term 0.12.1",
+ "ansi_term",
  "async-trait",
  "base64",
  "byteorder",
@@ -2890,6 +2899,7 @@ dependencies = [
 name = "zellij-tile"
 version = "0.25.0"
 dependencies = [
+ "clap",
  "serde",
  "serde_json",
  "strum",
@@ -2900,7 +2910,7 @@ dependencies = [
 name = "zellij-tile-utils"
 version = "0.25.0"
 dependencies = [
- "ansi_term 0.12.1",
+ "ansi_term",
 ]
 
 [[package]]
@@ -2911,6 +2921,8 @@ dependencies = [
  "async-std",
  "backtrace",
  "bincode",
+ "clap",
+ "clap_complete",
  "colored",
  "colorsys",
  "crossbeam",
@@ -2927,7 +2939,6 @@ dependencies = [
  "serde_yaml",
  "signal-hook",
  "strip-ansi-escapes",
- "structopt",
  "strum",
  "tempfile",
  "termion",
diff --git a/src/main.rs b/src/main.rs
index f4b8aa05d..98b27581a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,14 +5,14 @@ mod sessions;
 mod tests;
 
 use zellij_utils::{
+    clap::Parser,
     cli::{CliArgs, Command, Sessions},
     logging::*,
-    structopt::StructOpt,
 };
 
 fn main() {
     configure_logger();
-    let opts = CliArgs::from_args();
+    let opts = CliArgs::parse();
 
     if let Some(Command::Sessions(Sessions::ListSessions)) = opts.command {
         commands::list_sessions();
diff --git a/zellij-tile/Cargo.toml b/zellij-tile/Cargo.toml
index 583a7d17d..b42e21248 100644
--- a/zellij-tile/Cargo.toml
+++ b/zellij-tile/Cargo.toml
@@ -7,6 +7,7 @@ description = "A small client-side library for writing Zellij plugins"
 license = "MIT"
 
 [dependencies]
+clap = { version = "3.0", features = ["derive"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 strum = "0.20.0"
diff --git a/zellij-tile/src/data.rs b/zellij-tile/src/data.rs
index e120748a2..dae7cd09e 100644
--- a/zellij-tile/src/data.rs
+++ b/zellij-tile/src/data.rs
@@ -1,3 +1,4 @@
+use clap::ArgEnum;
 use serde::{Deserialize, Serialize};
 use std::fmt;
 use std::str::FromStr;
@@ -82,7 +83,7 @@ pub enum Event {
 }
 
 /// Describes the different input modes, which change the way that keystrokes will be interpreted.
-#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone, EnumIter, Serialize, Deserialize)]
+#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone, EnumIter, Serialize, Deserialize, ArgEnum)]
 pub enum InputMode {
     /// In `Normal` mode, input is always written to the terminal, except for the shortcuts leading
     /// to other modes
diff --git a/zellij-utils/Cargo.toml b/zellij-utils/Cargo.toml
index efd07f54f..3aefa684d 100644
--- a/zellij-utils/Cargo.toml
+++ b/zellij-utils/Cargo.toml
@@ -12,6 +12,8 @@ license = "MIT"
 anyhow = "1.0.45"
 backtrace = "0.3.55"
 bincode = "1.3.1"
+clap = { version = "3.0", features = ["derive", "env"] }
+clap_complete = "3.0"
 colored = "2.0.0"
 colorsys = "0.6.5"
 crossbeam = "0.8.0"
@@ -26,7 +28,6 @@ serde_yaml = "0.8"
 serde_json = "1.0"
 signal-hook = "0.3"
 strip-ansi-escapes = "0.1.0"
-structopt = "0.3"
 strum = "0.20.0"
 termion = "1.5.0"
 thiserror = "1.0.30"
diff --git a/zellij-utils/src/cli.rs b/zellij-utils/src/cli.rs
index 2c1aeba37..03bf8db4d 100644
--- a/zellij-utils/src/cli.rs
+++ b/zellij-utils/src/cli.rs
@@ -3,111 +3,111 @@ use crate::{
     consts::{ZELLIJ_CONFIG_DIR_ENV, ZELLIJ_CONFIG_FILE_ENV},
     input::options::CliOptions,
 };
+use clap::{Parser, Subcommand};
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
-use structopt::StructOpt;
 
-#[derive(StructOpt, Default, Debug, Clone, Serialize, Deserialize)]
-#[structopt(name = "zellij")]
+#[derive(Parser, Default, Debug, Clone, Serialize, Deserialize)]
+#[clap(version, name = "zellij")]
 pub struct CliArgs {
     /// Maximum panes on screen, caution: opening more panes will close old ones
-    #[structopt(long)]
+    #[clap(long)]
     pub max_panes: Option<usize>,
 
     /// Change where zellij looks for layouts and plugins
-    #[structopt(long, parse(from_os_str))]
+    #[clap(long, parse(from_os_str))]
     pub data_dir: Option<PathBuf>,
 
     /// Run server listening at the specified socket path
-    #[structopt(long, parse(from_os_str), hidden = true)]
+    #[clap(long, parse(from_os_str), hide = true)]
     pub server: Option<PathBuf>,
 
     /// Specify name of a new session
-    #[structopt(long, short)]
+    #[clap(long, short)]
     pub session: Option<String>,
 
     /// Name of a layout file in the layout directory
-    #[structopt(short, long, parse(from_os_str))]
+    #[clap(short, long, parse(from_os_str))]
     pub layout: Option<PathBuf>,
 
     /// Path to a layout yaml file
-    #[structopt(long, parse(from_os_str))]
+    #[clap(long, parse(from_os_str))]
     pub layout_path: Option<PathBuf>,
 
     /// Change where zellij looks for the configuration file
-    #[structopt(short, long, env=ZELLIJ_CONFIG_FILE_ENV, parse(from_os_str))]
+    #[clap(short, long, env = ZELLIJ_CONFIG_FILE_ENV, parse(from_os_str))]
     pub config: Option<PathBuf>,
 
     /// Change where zellij looks for the configuration directory
-    #[structopt(long, env=ZELLIJ_CONFIG_DIR_ENV, parse(from_os_str))]
+    #[clap(long, env = ZELLIJ_CONFIG_DIR_ENV, parse(from_os_str))]
     pub config_dir: Option<PathBuf>,
 
-    #[structopt(subcommand)]
+    #[clap(subcommand)]
     pub command: Option<Command>,
 
-    #[structopt(short, long)]
+    #[clap(short, long)]
     pub debug: bool,
 }
 
-#[derive(Debug, StructOpt, Clone, Serialize, Deserialize)]
+#[derive(Debug, Subcommand, Clone, Serialize, Deserialize)]
 pub enum Command {
     /// Change the behaviour of zellij
-    #[structopt(name = "options")]
+    #[clap(name = "options")]
     Options(CliOptions),
 
     /// Setup zellij and check its configuration
-    #[structopt(name = "setup")]
+    #[clap(name = "setup")]
     Setup(Setup),
 
     /// Explore existing zellij sessions
-    #[structopt(flatten)]
+    #[clap(flatten)]
     Sessions(Sessions),
 }
 
-#[derive(Debug, StructOpt, Clone, Serialize, Deserialize)]
+#[derive(Debug, Subcommand, Clone, Serialize, Deserialize)]
 pub enum SessionCommand {
     /// Change the behaviour of zellij
-    #[structopt(name = "options")]
+    #[clap(name = "options")]
     Options(CliOptions),
 }
 
-#[derive(Debug, StructOpt, Clone, Serialize, Deserialize)]
+#[derive(Debug, Subcommand, Clone, Serialize, Deserialize)]
 pub enum Sessions {
     /// List active sessions
-    #[structopt(alias = "ls")]
+    #[clap(alias = "ls")]
     ListSessions,
 
     /// Attach to session
-    #[structopt(alias = "a")]
+    #[clap(alias = "a")]
     Attach {
         /// Name of the session to attach to.
         session_name: Option<String>,
 
         /// Create a session if one does not exist.
-        #[structopt(short, long)]
+        #[clap(short, long)]
         create: bool,
 
         /// Number of the session index in the active sessions ordered creation date.
-        #[structopt(long)]
+        #[clap(long)]
         index: Option<usize>,
 
         /// Change the behaviour of zellij
-        #[structopt(subcommand, name = "options")]
+        #[clap(subcommand, name = "options")]
         options: Option<SessionCommand>,
     },
 
     /// Kill the specific session
-    #[structopt(alias = "k")]
+    #[clap(alias = "k")]
     KillSession {
         /// Name of target session
         target_session: Option<String>,
     },
 
     /// Kill all sessions
-    #[structopt(alias = "ka")]
+    #[clap(alias = "ka")]
     KillAllSessions {
         /// Automatic yes to prompts
-        #[structopt(short, long)]
+        #[clap(short, long)]
         yes: bool,
     },
 }
diff --git a/zellij-utils/src/input/options.rs b/zellij-utils/src/input/options.rs
index d8bef694b..41f241f69 100644
--- a/zellij-utils/src/input/options.rs
+++ b/zellij-utils/src/input/options.rs
@@ -1,12 +1,12 @@
 //! Handles cli and configuration options
 use crate::cli::Command;
+use clap::{ArgEnum, Args};
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 use std::str::FromStr;
-use structopt::StructOpt;
 use zellij_tile::data::InputMode;
 
-#[derive(Copy, Clone, Debug, PartialEq, Deserialize, Serialize)]
+#[derive(Copy, Clone, Debug, PartialEq, Deserialize, Serialize, ArgEnum)]
 pub enum OnForceClose {
     #[serde(alias = "quit")]
     Quit,
@@ -32,7 +32,7 @@ impl FromStr for OnForceClose {
     }
 }
 
-#[derive(Clone, Default, Debug, PartialEq, Deserialize, Serialize, StructOpt)]
+#[derive(Clone, Default, Debug, PartialEq, Deserialize, Serialize, Args)]
 /// Options that can be set either through the config file,
 /// or cli flags - cli flags should take precedence over the config file
 /// TODO: In order to correctly parse boolean flags, this is currently split
@@ -40,43 +40,43 @@ impl FromStr for OnForceClose {
 pub struct Options {
     /// Allow plugins to use a more simplified layout
     /// that is compatible with more fonts (true or false)
-    #[structopt(long)]
+    #[clap(long)]
     #[serde(default)]
     pub simplified_ui: Option<bool>,
     /// Set the default theme
-    #[structopt(long)]
+    #[clap(long)]
     pub theme: Option<String>,
     /// Set the default mode
-    #[structopt(long)]
+    #[clap(long, arg_enum, hide_possible_values = true)]
     pub default_mode: Option<InputMode>,
     /// Set the default shell
-    #[structopt(long, parse(from_os_str))]
+    #[clap(long, parse(from_os_str))]
     pub default_shell: Option<PathBuf>,
     /// Set the layout_dir, defaults to
     /// subdirectory of config dir
-    #[structopt(long, parse(from_os_str))]
+    #[clap(long, parse(from_os_str))]
     pub layout_dir: Option<PathBuf>,
-    #[structopt(long)]
+    #[clap(long)]
     #[serde(default)]
     /// Set the handling of mouse events (true or false)
     /// Can be temporarily bypassed by the [SHIFT] key
     pub mouse_mode: Option<bool>,
-    #[structopt(long)]
+    #[clap(long)]
     #[serde(default)]
     /// Set display of the pane frames (true or false)
     pub pane_frames: Option<bool>,
-    #[structopt(long)]
+    #[clap(long)]
     #[serde(default)]
     /// Mirror session when multiple users are connected (true or false)
     pub mirror_session: Option<bool>,
     /// Set behaviour on force close (quit or detach)
-    #[structopt(long)]
+    #[clap(long, arg_enum, hide_possible_values = true)]
     pub on_force_close: Option<OnForceClose>,
-    #[structopt(long)]
+    #[clap(long)]
     pub scroll_buffer_size: Option<usize>,
 
     /// Switch to using a user supplied command for clipboard instead of OSC52
-    #[structopt(long)]
+    #[clap(long)]
     #[serde(default)]
     pub copy_command: Option<String>,
 }
@@ -173,17 +173,17 @@ impl Options {
     }
 }
 
-#[derive(Clone, Default, Debug, PartialEq, StructOpt, Serialize, Deserialize)]
+#[derive(Clone, Default, Debug, PartialEq, Args, Serialize, Deserialize)]
 /// Options that can be set through cli flags
 /// boolean flags end up toggling boolean options in `Options`
 pub struct CliOptions {
     /// Disable handling of mouse events
-    #[structopt(long, conflicts_with("mouse-mode"))]
+    #[clap(long, conflicts_with("mouse-mode"))]
     pub disable_mouse_mode: bool,
     /// Disable display of pane frames
-    #[structopt(long, conflicts_with("pane-frames"))]
+    #[clap(long, conflicts_with("pane-frames"))]
     pub no_pane_frames: bool,
-    #[structopt(flatten)]
+    #[clap(flatten)]
     options: Options,
 }
 
diff --git a/zellij-utils/src/lib.rs b/zellij-utils/src/lib.rs
index 4ccb25f5e..7115c1b46 100644
--- a/zellij-utils/src/lib.rs
+++ b/zellij-utils/src/lib.rs
@@ -12,13 +12,13 @@ pub mod setup;
 pub mod shared;
 
 pub use async_std;
+pub use clap;
 pub use interprocess;
 pub use libc;
 pub use nix;
 pub use serde;
 pub use serde_yaml;
 pub use signal_hook;
-pub use structopt;
 pub use termion;
 pub use vte;
 pub use zellij_tile;
diff --git a/zellij-utils/src/setup.rs b/zellij-utils/src/setup.rs
index 0de857249..565e72c9d 100644
--- a/zellij-utils/src/setup.rs
+++ b/zellij-utils/src/setup.rs
@@ -10,12 +10,13 @@ use crate::{
         options::Options,
     },
 };
+use clap::{Args, IntoApp};
+use clap_complete::Shell;
 use directories_next::BaseDirs;
 use serde::{Deserialize, Serialize};
 use std::{
     convert::TryFrom, fmt::Write as FmtWrite, io::Write, path::Path, path::PathBuf, process,
 };
-use structopt::StructOpt;
 
 const CONFIG_LOCATION: &str = ".config/zellij";
 const CONFIG_NAME: &str = "config.yaml";
@@ -124,25 +125,25 @@ pub fn dump_specified_layout(layout: &str) -> std::io::Result<()> {
     }
 }
 
-#[derive(Debug, Default, Clone, StructOpt, Serialize, Deserialize)]
+#[derive(Debug, Default, Clone, Args, Serialize, Deserialize)]
 pub struct Setup {
     /// Dump the default configuration file to stdout
-    #[structopt(long)]
+    #[clap(long)]
     pub dump_config: bool,
     /// Disables loading of configuration file at default location,
     /// loads the defaults that zellij ships with
-    #[structopt(long)]
+    #[clap(long)]
     pub clean: bool,
     /// Checks the configuration of zellij and displays
     /// currently used directories
-    #[structopt(long)]
+    #[clap(long)]
     pub check: bool,
 
     /// Dump the specified layout file to stdout
-    #[structopt(long)]
+    #[clap(long)]
     pub dump_layout: Option<String>,
     /// Generates completion for the specified shell
-    #[structopt(long)]
+    #[clap(long, value_name = "SHELL")]
     pub generate_completion: Option<String>,
 }
 
@@ -231,7 +232,7 @@ impl Setup {
         }
 
         if let Some(shell) = &self.generate_completion {
-            Self::generate_completion(shell.into());
+            Self::generate_completion(shell);
             std::process::exit(0);
         }
 
@@ -376,8 +377,8 @@ impl Setup {
 
         Ok(())
     }
-    fn generate_completion(shell: String) {
-        let shell = match shell.parse() {
+    fn generate_completion(shell: &str) {
+        let shell: Shell = match shell.to_lowercase().parse() {
             Ok(shell) => shell,
             _ => {
                 eprintln!("Unsupported shell: {}", shell);
@@ -385,7 +386,7 @@ impl Setup {
             }
         };
         let mut out = std::io::stdout();
-        CliArgs::clap().gen_completions_to("zellij", shell, &mut out);
+        clap_complete::generate(shell, &mut CliArgs::into_app(), "zellij", &mut out);
     }
 }