Use POSIX implementation for ksh shells

Only ksh93 supports DEBUG traps, and the rest don't have any features
that can be used for setting up hooks. May as well use the POSIX
implementation for all ksh shells.

README.md

@@ -242,21 +242,6 @@ zoxide can be installed in 4 easy steps:
 
    </details>
 
-   <details>
-   <summary>Ksh</summary>
-
-   > Add this to the <ins>**end**</ins> of your config file (usually `~/.kshrc`):
-   >
-   > ```sh
-   > # ksh93
-   > eval "$(zoxide init ksh)"
-   >
-   > # mksh, oksh, etc.
-   > eval "$(zoxide init ksh --hook=prompt)"
-   > ```
-
-   </details>
-
    <details>
    <summary>Nushell</summary>
 

man/man1/zoxide-init.1

@@ -30,13 +30,6 @@ Add this to the \fBend\fR of your config file (usually
     \fBzoxide init fish | source\fR
 .fi
 .TP
-.B ksh
-Add this to the \fBend\fR of your config file (usually \fB~/.kshrc\fR):
-.sp
-.nf
-    \fBeval $(zoxide init ksh)\fR
-.fi
-.TP
 .B nushell
 Add this to the \fBend\fR of your env file (find it by running
 \fB$nu.env-path\fR in Nushell):

src/cmd/cmd.rs

@@ -137,8 +137,8 @@ pub enum InitShell {
     Bash,
     Elvish,
     Fish,
-    Ksh,
     Nushell,
+    #[clap(alias = "ksh")]
     Posix,
     Powershell,
     Xonsh,

src/cmd/init.rs

@@ -6,7 +6,7 @@ use rinja::Template;
 use crate::cmd::{Init, InitShell, Run};
 use crate::config;
 use crate::error::BrokenPipeHandler;
-use crate::shell::{Bash, Elvish, Fish, Ksh, Nushell, Opts, Posix, Powershell, Xonsh, Zsh};
+use crate::shell::{Bash, Elvish, Fish, Nushell, Opts, Posix, Powershell, Xonsh, Zsh};
 
 impl Run for Init {
     fn run(&self) -> Result<()> {
@@ -19,7 +19,6 @@ impl Run for Init {
             InitShell::Bash => Bash(opts).render(),
             InitShell::Elvish => Elvish(opts).render(),
             InitShell::Fish => Fish(opts).render(),
-            InitShell::Ksh => Ksh(opts).render(),
             InitShell::Nushell => Nushell(opts).render(),
             InitShell::Posix => Posix(opts).render(),
             InitShell::Powershell => Powershell(opts).render(),

src/shell.rs

@@ -26,7 +26,6 @@ macro_rules! make_template {
 make_template!(Bash, "bash.txt");
 make_template!(Elvish, "elvish.txt");
 make_template!(Fish, "fish.txt");
-make_template!(Ksh, "ksh.txt");
 make_template!(Nushell, "nushell.txt");
 make_template!(Posix, "posix.txt");
 make_template!(Powershell, "powershell.txt");
@@ -159,42 +158,6 @@ mod tests {
             .stderr("");
     }
 
-    #[apply(opts)]
-    fn ksh_ksh(cmd: Option<&str>, hook: InitHook, echo: bool, resolve_symlinks: bool) {
-        let opts = Opts { cmd, hook, echo, resolve_symlinks };
-        let source = Ksh(&opts).render().unwrap();
-        Command::new("ksh").args(["-n", "-c", &source]).assert().success().stdout("").stderr("");
-    }
-
-    #[apply(opts)]
-    fn ksh_shellcheck(cmd: Option<&str>, hook: InitHook, echo: bool, resolve_symlinks: bool) {
-        let opts = Opts { cmd, hook, echo, resolve_symlinks };
-        let source = Ksh(&opts).render().unwrap();
-
-        Command::new("shellcheck")
-            .args(["--enable=all", "-"])
-            .write_stdin(source)
-            .assert()
-            .success()
-            .stdout("")
-            .stderr("");
-    }
-
-    #[apply(opts)]
-    fn ksh_shfmt(cmd: Option<&str>, hook: InitHook, echo: bool, resolve_symlinks: bool) {
-        let opts = Opts { cmd, hook, echo, resolve_symlinks };
-        let mut source = Ksh(&opts).render().unwrap();
-        source.push('\n');
-
-        Command::new("shfmt")
-            .args(["--diff", "--indent=4", "--language-dialect=mksh", "--simplify", "-"])
-            .write_stdin(source)
-            .assert()
-            .success()
-            .stdout("")
-            .stderr("");
-    }
-
     #[apply(opts)]
     fn nushell_nushell(cmd: Option<&str>, hook: InitHook, echo: bool, resolve_symlinks: bool) {
         let opts = Opts { cmd, hook, echo, resolve_symlinks };