feat: add support for tcsh (#2288)

* feat: add support for tcsh

* add tcsh to install.sh install message

* list tcsh in bug_report.rs and main.rs

* quote starship path

Co-authored-by: David Knaack <davidkna@users.noreply.github.com>

* fix job count

* add tcsh support to shell module

* fix STARSHIP_START_TIME undefined error

* preserve existing user precmd and postcmd, remove jobs support

* remove unnecessary parentheses

* minor script improvement

* removes parens from install script message

* Update docs/config/README.md

Co-authored-by: Thomas O'Donnell <andytom@users.noreply.github.com>

Co-authored-by: David Knaack <davidkna@users.noreply.github.com>
Co-authored-by: Thomas O'Donnell <andytom@users.noreply.github.com>

14 files changed, 70 insertions, 1 deletions

diff --git a/README.md b/README.md
index 83405d67d..5674067a1 100644
--- a/README.md
+++ b/README.md
@@ -235,6 +235,16 @@ shown below. Can't see yours? Have a look at the [extra platform instructions](h
    eval (starship init elvish)
    ```
 
+   #### Tcsh
+
+   Add the following to the end of `~/.tcshrc`:
+
+   ```sh
+   # ~/.tcshrc
+
+   eval "`starship init tcsh`"
+   ```
+
 ## 🤝 Contributing
 
 We are always looking for contributors of **all skill levels**! If you're looking to ease your way into the project, try out a [good first issue](https://github.com/starship/starship/labels/🌱%20good%20first%20issue).
diff --git a/docs/README.md b/docs/README.md
index 5fdedb9cf..6a7435b0e 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -115,3 +115,13 @@ description: Starship is the minimal, blazing fast, and extremely customizable p
    eval (starship init elvish)
    ```
 
+   #### Tcsh
+
+   Add the following to the end of `~/.tcshrc`:
+
+   ```sh
+   # ~/.tcshrc
+
+   eval "`starship init tcsh`"
+   ```
+
diff --git a/docs/config/README.md b/docs/config/README.md
index 9502d0ddb..b00a3e922 100644
--- a/docs/config/README.md
+++ b/docs/config/README.md
@@ -1408,6 +1408,12 @@ The module will be shown only if there are background jobs running.
 The module will show the number of jobs running if there is more than 1 job, or
 more than the `threshold` config value, if it exists.
 
+::: warning
+
+This module is not supported on tcsh.
+
+:::
+
 ### Options
 
 | Option      | Default                       | Description                                      |
@@ -2284,6 +2290,7 @@ To enable it, set `disabled` to `false` in your configuration file.
 | `powershell_indicator` | `psh`         | A format string used to represent powershell. |
 | `ion_indicator`        | `ion`         | A format string used to represent ion.        |
 | `elvish_indicator`     | `esh`         | A format string used to represent elvish.     |
+| `tcsh_indicator`       | `tsh`         | A format string used to represent tcsh.       |
 | `format`               | `$indicator ` | The format for the module.                    |
 | `disabled`             | `true`        | Disables the `shell` module.                  |
 
diff --git a/install/install.sh b/install/install.sh
index 891cf1082..2263df2f1 100755
--- a/install/install.sh
+++ b/install/install.sh
@@ -432,4 +432,9 @@ info "Please follow the steps for your shell to complete the installation:
   Add the following to the end of ${BOLD}~/.config/ion/initrc${NO_COLOR}:
 
       eval \$(starship init ion)
+
+  ${BOLD}${UNDERLINE}Tcsh${NO_COLOR}
+  Add the following to the end of ${BOLD}~/.tcshrc${NO_COLOR}:
+
+      eval "`starship init tcsh`"
 "
diff --git a/src/bug_report.rs b/src/bug_report.rs
index d93fcc80f..943a146f0 100644
--- a/src/bug_report.rs
+++ b/src/bug_report.rs
@@ -205,6 +205,7 @@ fn get_config_path(shell: &str) -> Option<PathBuf> {
             }
             "zsh" => Some(".zshrc"),
             "elvish" => Some(".elvish/rc.elv"),
+            "tcsh" => Some(".tcshrc"),
             _ => None,
         }
         .map(|path| home_dir.join(path))
diff --git a/src/configs/shell.rs b/src/configs/shell.rs
index 24551df97..4b56189c6 100644
--- a/src/configs/shell.rs
+++ b/src/configs/shell.rs
@@ -11,6 +11,7 @@ pub struct ShellConfig<'a> {
     pub powershell_indicator: &'a str,
     pub ion_indicator: &'a str,
     pub elvish_indicator: &'a str,
+    pub tcsh_indicator: &'a str,
     pub disabled: bool,
 }
 
@@ -24,6 +25,7 @@ impl<'a> RootModuleConfig<'a> for ShellConfig<'a> {
             powershell_indicator: "psh",
             ion_indicator: "ion",
             elvish_indicator: "esh",
+            tcsh_indicator: "tsh",
             disabled: true,
         }
     }
diff --git a/src/context.rs b/src/context.rs
index 251e5e337..807f3d183 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -251,6 +251,7 @@ impl<'a> Context<'a> {
             "powershell" => Shell::PowerShell,
             "zsh" => Shell::Zsh,
             "elvish" => Shell::Elvish,
+            "tcsh" => Shell::Tcsh,
             _ => Shell::Unknown,
         }
     }
@@ -486,6 +487,7 @@ pub enum Shell {
     PowerShell,
     Zsh,
     Elvish,
+    Tcsh,
     Unknown,
 }
 
diff --git a/src/init/mod.rs b/src/init/mod.rs
index a06bf32d7..be1d228f0 100644
--- a/src/init/mod.rs
+++ b/src/init/mod.rs
@@ -173,6 +173,13 @@ fi"#,
             );
             Some(script)
         }
+        Some("tcsh") => {
+            let script = format!(
+                r#"eval "`("{}" init tcsh --print-full-init)`""#,
+                starship.sprint_posix()?
+            );
+            Some(script)
+        }
         None => {
             println!(
                 "Invalid shell name provided: {}\\n\
@@ -212,6 +219,7 @@ pub fn init_main(shell_name: &str) -> io::Result<()> {
         "powershell" => print_script(PWSH_INIT, &starship_path.sprint()?),
         "ion" => print_script(ION_INIT, &starship_path.sprint()?),
         "elvish" => print_script(ELVISH_INIT, &starship_path.sprint_posix()?),
+        "tcsh" => print_script(TCSH_INIT, &starship_path.sprint_posix()?),
         _ => {
             println!(
                 "printf \"Shell name detection failed on phase two init.\\n\
@@ -255,3 +263,5 @@ const PWSH_INIT: &str = include_str!("starship.ps1");
 const ION_INIT: &str = include_str!("starship.ion");
 
 const ELVISH_INIT: &str = include_str!("starship.elv");
+
+const TCSH_INIT: &str = include_str!("starship.tcsh");
diff --git a/src/init/starship.tcsh b/src/init/starship.tcsh
new file mode 100644
index 000000000..7d4b4b9a0
--- /dev/null
+++ b/src/init/starship.tcsh
@@ -0,0 +1,9 @@
+setenv STARSHIP_SHELL tcsh;
+setenv STARSHIP_SESSION_KEY `::STARSHIP:: session`;
+set USER_PRECMD = "`alias precmd`";
+set USER_POSTCMD = "`alias postcmd`";
+set STARSHIP_PRECMD = 'set STARSHIP_CMD_STATUS = $status;set STARSHIP_PATH = ::STARSHIP::;set STARSHIP_END_TIME = `$STARSHIP_PATH time`;set STARSHIP_DURATION = 0;if ( $STARSHIP_START_TIME != -1 ) @ STARSHIP_DURATION = $STARSHIP_END_TIME - $STARSHIP_START_TIME;set prompt = "`$STARSHIP_PATH prompt --status $STARSHIP_CMD_STATUS --cmd-duration $STARSHIP_DURATION`";set STARSHIP_START_TIME = -1';
+set STARSHIP_POSTCMD = 'set STARSHIP_START_TIME = `::STARSHIP:: time`';
+alias precmd "$STARSHIP_PRECMD;$USER_PRECMD";
+alias postcmd "$STARSHIP_POSTCMD;$USER_POSTCMD";
+set STARSHIP_START_TIME = `::STARSHIP:: time`;
diff --git a/src/main.rs b/src/main.rs
index 2701b21f3..977f99414 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -41,7 +41,7 @@ fn main() {
     let shell_arg = Arg::with_name("shell")
         .value_name("SHELL")
         .help(
-            "The name of the currently running shell\nCurrently supported options: bash, zsh, fish, powershell, ion, elvish",
+            "The name of the currently running shell\nCurrently supported options: bash, zsh, fish, powershell, ion, elvish, tcsh",
         )
         .required(true);
 
diff --git a/src/module.rs b/src/module.rs
index e222ef2e0..7a6961beb 100644
--- a/src/module.rs
+++ b/src/module.rs
@@ -144,6 +144,7 @@ impl<'a> Module<'a> {
         match shell {
             Shell::Bash => ansi_strings_modified(ansi_strings, shell),
             Shell::Zsh => ansi_strings_modified(ansi_strings, shell),
+            Shell::Tcsh => ansi_strings_modified(ansi_strings, shell),
             _ => ansi_strings,
         }
     }
diff --git a/src/modules/shell.rs b/src/modules/shell.rs
index fe90b2e89..fc51b52f7 100644
--- a/src/modules/shell.rs
+++ b/src/modules/shell.rs
@@ -23,6 +23,7 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
                     Shell::PowerShell => Some(config.powershell_indicator),
                     Shell::Ion => Some(config.ion_indicator),
                     Shell::Elvish => Some(config.elvish_indicator),
+                    Shell::Tcsh => Some(config.tcsh_indicator),
                     Shell::Unknown => None,
                 },
                 _ => None,
diff --git a/src/print.rs b/src/print.rs
index 78e67694c..0330af07e 100644
--- a/src/print.rs
+++ b/src/print.rs
@@ -87,6 +87,13 @@ pub fn get_prompt(context: Context) -> String {
     }
     write!(buf, "{}", ANSIStrings(&module_strings)).unwrap();
 
+    // escape \n and ! characters for tcsh
+    if let Shell::Tcsh = context.shell {
+        buf = buf.replace('!', "\\!");
+        // space is required before newline
+        buf = buf.replace('\n', " \\n");
+    }
+
     buf
 }
 
diff --git a/src/utils.rs b/src/utils.rs
index c9d076ae7..d1a3025c5 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -226,6 +226,8 @@ pub fn wrap_seq_for_shell(
     const BASH_END: &str = "\u{5c}\u{5d}"; // \]
     const ZSH_BEG: &str = "\u{25}\u{7b}"; // %{
     const ZSH_END: &str = "\u{25}\u{7d}"; // %}
+    const TCSH_BEG: &str = "\u{25}\u{7b}"; // %{
+    const TCSH_END: &str = "\u{25}\u{7d}"; // %}
 
     // ANSI escape codes cannot be nested, so we can keep track of whether we're
     // in an escape or not with a single boolean variable
@@ -238,6 +240,7 @@ pub fn wrap_seq_for_shell(
                 match shell {
                     Shell::Bash => format!("{}{}", BASH_BEG, escape_begin),
                     Shell::Zsh => format!("{}{}", ZSH_BEG, escape_begin),
+                    Shell::Tcsh => format!("{}{}", TCSH_BEG, escape_begin),
                     _ => x.to_string(),
                 }
             } else if x == escape_end && escaped {
@@ -245,6 +248,7 @@ pub fn wrap_seq_for_shell(
                 match shell {
                     Shell::Bash => format!("{}{}", escape_end, BASH_END),
                     Shell::Zsh => format!("{}{}", escape_end, ZSH_END),
+                    Shell::Tcsh => format!("{}{}", escape_end, TCSH_END),
                     _ => x.to_string(),
                 }
             } else {