feat(deno): create module (#2565)

* Add deno module

* Update docs

* Update src/utils.rs

Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>

* Update src/modules/deno.rs

Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>

* Update src/modules/deno.rs

Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>

* Update src/modules/deno.rs

Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>

* Update src/modules/deno.rs

Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>

* run rust fmt

* Use deno -V

* fmt

* Fix deno module

* do clippy

* Update src/configs/deno.rs

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

* Update src/modules/deno.rs

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

* Update docs/config/README.md

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

* Fix test and docs

* Remove unused code

* fmt

* update configs

* Add more tests

* Update docs/config/README.md

Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>

Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>
Co-authored-by: David Knaack <davidkna@users.noreply.github.com>

8 files changed, 201 insertions, 0 deletions

diff --git a/docs/config/README.md b/docs/config/README.md
index 6b9a6c132..911d819a9 100644
--- a/docs/config/README.md
+++ b/docs/config/README.md
@@ -199,6 +199,7 @@ $docker_context\
 $package\
 $cmake\
 $dart\
+$deno\
 $dotnet\
 $elixir\
 $elm\
@@ -650,6 +651,41 @@ By default the module will be shown if any of the following conditions are met:
 format = "via [🔰 $version](bold red) "
 ```
 
+## Deno
+
+The `deno` module shows you your currently installed version of Deno.
+By default the module will be shown if any of the following conditions are met:
+- The current directory contains a `mod.ts`, `mod.js`, `deps.ts` or `deps.js` file
+
+### Options
+
+| Option              | Default                                           | Description                                     |
+| ------------------- | ------------------------------------------------- | ----------------------------------------------- |
+| `format`            | `"via [$symbol($version )]($style)"`              | The format for the module.                      |
+| `symbol`            | `"🦕 "`                                           | A format string representing the symbol of Deno |
+| `detect_extensions` | `[]`                                        | Which extensions should trigger this module.    |
+| `detect_files`      | `["mod.ts", "mod.js", "deps.ts", "deps.js"]` | Which filenames should trigger this module.     |
+| `detect_folders`    | `[]`                                  | Which folders should trigger this module.       |
+| `style`             | `"green bold"`                                     | The style for the module.                       |
+| `disabled`          | `false`                                           | Disables the `deno` module.                     |
+
+### Variables
+
+| Variable | Example  | Description                          |
+| -------- | -------- | ------------------------------------ |
+| version  | `v1.8.3` | The version of `deno`                |
+| symbol   |          | Mirrors the value of option `symbol` |
+| style\*  |          | Mirrors the value of option `style`  |
+
+### Example
+
+```toml
+# ~/.config/starship.toml
+
+[deno]
+format = "via [🦕 $version](green bold) "
+```
+
 ## Directory
 
 The `directory` module shows the path to your current directory, truncated to
diff --git a/src/configs/deno.rs b/src/configs/deno.rs
new file mode 100644
index 000000000..398178430
--- /dev/null
+++ b/src/configs/deno.rs
@@ -0,0 +1,29 @@
+use crate::config::ModuleConfig;
+
+use serde::Serialize;
+use starship_module_config_derive::ModuleConfig;
+
+#[derive(Clone, ModuleConfig, Serialize)]
+pub struct DenoConfig<'a> {
+    pub format: &'a str,
+    pub symbol: &'a str,
+    pub style: &'a str,
+    pub disabled: bool,
+    pub detect_extensions: Vec<&'a str>,
+    pub detect_files: Vec<&'a str>,
+    pub detect_folders: Vec<&'a str>,
+}
+
+impl<'a> Default for DenoConfig<'a> {
+    fn default() -> Self {
+        DenoConfig {
+            format: "via [$symbol($version )]($style)",
+            symbol: "🦕 ",
+            style: "green bold",
+            disabled: false,
+            detect_extensions: vec![],
+            detect_files: vec!["mod.ts", "deps.ts", "mod.js", "deps.js"],
+            detect_folders: vec![],
+        }
+    }
+}
diff --git a/src/configs/mod.rs b/src/configs/mod.rs
index 559d0040d..636284835 100644
--- a/src/configs/mod.rs
+++ b/src/configs/mod.rs
@@ -12,6 +12,7 @@ pub mod conda;
 pub mod crystal;
 pub mod custom;
 pub mod dart;
+pub mod deno;
 pub mod directory;
 pub mod docker_context;
 pub mod dotnet;
@@ -80,6 +81,7 @@ pub struct FullConfig<'a> {
     conda: conda::CondaConfig<'a>,
     crystal: crystal::CrystalConfig<'a>,
     dart: dart::DartConfig<'a>,
+    deno: deno::DenoConfig<'a>,
     directory: directory::DirectoryConfig<'a>,
     docker_context: docker_context::DockerContextConfig<'a>,
     dotnet: dotnet::DotnetConfig<'a>,
diff --git a/src/configs/starship_root.rs b/src/configs/starship_root.rs
index add0734ba..b727aaf15 100644
--- a/src/configs/starship_root.rs
+++ b/src/configs/starship_root.rs
@@ -34,6 +34,7 @@ pub const PROMPT_ORDER: &[&str] = &[
     // (Let's keep these sorted alphabetically)
     "cmake",
     "dart",
+    "deno",
     "dotnet",
     "elixir",
     "elm",
diff --git a/src/module.rs b/src/module.rs
index 63eaef4df..7cd593f26 100644
--- a/src/module.rs
+++ b/src/module.rs
@@ -17,6 +17,7 @@ pub const ALL_MODULES: &[&str] = &[
     "cmd_duration",
     "conda",
     "dart",
+    "deno",
     "directory",
     "docker_context",
     "dotnet",
diff --git a/src/modules/deno.rs b/src/modules/deno.rs
new file mode 100644
index 000000000..8b1fac5fe
--- /dev/null
+++ b/src/modules/deno.rs
@@ -0,0 +1,125 @@
+use super::{Context, Module, RootModuleConfig};
+
+use crate::configs::deno::DenoConfig;
+use crate::formatter::StringFormatter;
+
+/// Creates a module with the current Deno version
+pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
+    let mut module = context.new_module("deno");
+    let config = DenoConfig::try_load(module.config);
+    let is_deno_project = context
+        .try_begin_scan()?
+        .set_files(&config.detect_files)
+        .is_match();
+
+    if !is_deno_project {
+        return None;
+    }
+
+    let parsed = StringFormatter::new(config.format).and_then(|formatter| {
+        formatter
+            .map_meta(|var, _| match var {
+                "symbol" => Some(config.symbol),
+                _ => None,
+            })
+            .map_style(|variable| match variable {
+                "style" => Some(Ok(config.style)),
+                _ => None,
+            })
+            .map(|variable| match variable {
+                "version" => context
+                    .exec_cmd("deno", &["-V"])
+                    .and_then(|output| parse_deno_version(output.stdout.trim()))
+                    .map(Ok),
+                _ => None,
+            })
+            .parse(None)
+    });
+
+    module.set_segments(match parsed {
+        Ok(segments) => segments,
+        Err(error) => {
+            log::warn!("Error in module `deno`:\n{}", error);
+            return None;
+        }
+    });
+
+    Some(module)
+}
+
+fn parse_deno_version(deno_version: &str) -> Option<String> {
+    let version = deno_version
+        // split into ["deno", "1.8.3"]
+        .split_whitespace()
+        // return "1.8.3"
+        .nth(1)?;
+
+    Some(format!("v{}", version))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::parse_deno_version;
+    use crate::test::ModuleRenderer;
+    use ansi_term::Color;
+    use std::fs::File;
+    use std::io;
+
+    #[test]
+    fn test_parse_deno_version() {
+        const OUTPUT: &str = "deno 1.8.3\n";
+        assert_eq!(
+            parse_deno_version(OUTPUT.trim()),
+            Some("v1.8.3".to_string())
+        )
+    }
+
+    #[test]
+    fn folder_without_deno_files() -> io::Result<()> {
+        let dir = tempfile::tempdir()?;
+        let actual = ModuleRenderer::new("deno").path(dir.path()).collect();
+        let expected = None;
+        assert_eq!(expected, actual);
+        dir.close()
+    }
+
+    #[test]
+    fn folder_with_mod_ts() -> io::Result<()> {
+        let dir = tempfile::tempdir()?;
+        File::create(dir.path().join("mod.ts"))?.sync_all()?;
+        let actual = ModuleRenderer::new("deno").path(dir.path()).collect();
+        let expected = Some(format!("via {}", Color::Green.bold().paint("🦕 v1.8.3 ")));
+        assert_eq!(expected, actual);
+        dir.close()
+    }
+
+    #[test]
+    fn folder_with_mod_js() -> io::Result<()> {
+        let dir = tempfile::tempdir()?;
+        File::create(dir.path().join("mod.js"))?.sync_all()?;
+        let actual = ModuleRenderer::new("deno").path(dir.path()).collect();
+        let expected = Some(format!("via {}", Color::Green.bold().paint("🦕 v1.8.3 ")));
+        assert_eq!(expected, actual);
+        dir.close()
+    }
+
+    #[test]
+    fn folder_with_deps_ts() -> io::Result<()> {
+        let dir = tempfile::tempdir()?;
+        File::create(dir.path().join("deps.ts"))?.sync_all()?;
+        let actual = ModuleRenderer::new("deno").path(dir.path()).collect();
+        let expected = Some(format!("via {}", Color::Green.bold().paint("🦕 v1.8.3 ")));
+        assert_eq!(expected, actual);
+        dir.close()
+    }
+
+    #[test]
+    fn folder_with_deps_js() -> io::Result<()> {
+        let dir = tempfile::tempdir()?;
+        File::create(dir.path().join("deps.js"))?.sync_all()?;
+        let actual = ModuleRenderer::new("deno").path(dir.path()).collect();
+        let expected = Some(format!("via {}", Color::Green.bold().paint("🦕 v1.8.3 ")));
+        assert_eq!(expected, actual);
+        dir.close()
+    }
+}
diff --git a/src/modules/mod.rs b/src/modules/mod.rs
index 39e3b86d1..c3fd6e658 100644
--- a/src/modules/mod.rs
+++ b/src/modules/mod.rs
@@ -7,6 +7,7 @@ mod conda;
 mod crystal;
 pub(crate) mod custom;
 mod dart;
+mod deno;
 mod directory;
 mod docker_context;
 mod dotnet;
@@ -80,6 +81,7 @@ pub fn handle<'a>(module: &str, context: &'a Context) -> Option<Module<'a>> {
             "cmd_duration" => cmd_duration::module(context),
             "conda" => conda::module(context),
             "dart" => dart::module(context),
+            "deno" => deno::module(context),
             "directory" => directory::module(context),
             "docker_context" => docker_context::module(context),
             "dotnet" => dotnet::module(context),
@@ -162,6 +164,7 @@ pub fn description(module: &str) -> &'static str {
         "conda" => "The current conda environment, if $CONDA_DEFAULT_ENV is set",
         "crystal" => "The currently installed version of Crystal",
         "dart" => "The currently installed version of Dart",
+        "deno" => "The currently installed version of Deno",
         "directory" => "The current working directory",
         "docker_context" => "The current docker context",
         "dotnet" => "The relevant version of the .NET Core SDK for the current directory",
diff --git a/src/utils.rs b/src/utils.rs
index 381a628fd..45ea07f2a 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -57,6 +57,10 @@ Default target: x86_64-apple-macosx\n",
                 "Dart VM version: 2.8.4 (stable) (Wed Jun 3 12:26:04 2020 +0200) on \"macos_x64\"",
             ),
         }),
+        "deno -V" => Some(CommandOutput {
+            stdout: String::from("deno 1.8.3\n"),
+            stderr: String::default()
+        }),
         "dummy_command" => Some(CommandOutput {
             stdout: String::from("stdout ok!\n"),
             stderr: String::from("stderr ok!\n"),