feat(module): Add a meson devenv indicator (#4389)

* feat(module): Add a meson devenv indicator

Adds a Meson Developer Environment indicator, if the MESON_DEVENV
variable is set. Inside a `meson devenv`, the prompt will include the
current Meson project name

This also contains a new Truncate utility function, which may be adapted for other modules in the future

* docs: Add Meson to presets

docs/.vuepress/public/presets/toml/bracketed-segments.toml

@@ -85,6 +85,9 @@ format = '\[[$symbol($version)]($style)\]'
 [memory_usage]
 format = '\[$symbol[$ram( | $swap)]($style)\]'
 
+[meson]
+format = '\[[$symbol$project]($style)\]'
+
 [nim]
 format = '\[[$symbol($version)]($style)\]'
 

docs/.vuepress/public/presets/toml/nerd-font-symbols.toml

@@ -49,6 +49,9 @@ symbol = " "
 [memory_usage]
 symbol = " "
 
+[meson]
+symbol = "喝 "
+
 [nim]
 symbol = " "
 

docs/.vuepress/public/presets/toml/no-runtime-versions.toml

@@ -49,6 +49,9 @@ format = 'via [$symbol]($style)'
 [lua]
 format = 'via [$symbol]($style)'
 
+[meson]
+format = 'via [$symbol]($style)'
+
 [nim]
 format = 'via [$symbol]($style)'
 

docs/.vuepress/public/presets/toml/plain-text-symbols.toml

@@ -85,6 +85,9 @@ symbol = "nodejs "
 [memory_usage]
 symbol = "memory "
 
+[meson]
+symbol = "meson "
+
 [nim]
 symbol = "nim "
 

docs/config/README.md

@@ -278,6 +278,7 @@ $zig\
 $buf\
 $nix_shell\
 $conda\
+$meson\
 $spack\
 $memory_usage\
 $aws\
@@ -2384,6 +2385,45 @@ symbol = " "
 style = "bold dimmed green"
 ```
 
+## Meson
+
+The `meson` module shows the current Meson developer environment status.
+
+By default the Meson project name is displayed, if `$MESON_DEVENV` is set.
+
+### Options
+
+| Option              | Default                            | Description                                                                               |
+| ------------------- | ---------------------------------- | ----------------------------------------------------------------------------------------- |
+| `truncation_length` | `2^32 - 1`                         | Truncates a project name to `N` graphemes.                                                |
+| `truncation_symbol` | `"…"`                              | The symbol used to indicate a project name was truncated. You can use `""` for no symbol. |
+| `format`            | `"via [$symbol$project]($style) "` | The format for the module.                                                                |
+| `symbol`            | `"⬢ "`                             | The symbol used before displaying the project name.                                       |
+| `style`             | `"blue bold"`                      | The style for the module.                                                                 |
+| `disabled`          | `false`                            | Disables the `meson` module.                                                              |
+
+### Variables
+
+| Variable | Example    | Description                          |
+| -------- | ---------- | ------------------------------------ |
+| project  | `starship` | The current Meson project name       |
+| symbol   | `🐏`        | Mirrors the value of option `symbol` |
+| style\*  |            | Mirrors the value of option `style`  |
+
+*: This variable can only be used as a part of a style string
+
+### Example
+
+```toml
+# ~/.config/starship.toml
+
+[meson]
+disabled = false
+truncation_symbol = "--"
+symbol = " "
+style = "bold dimmed green"
+```
+
 ## Mercurial Branch
 
 The `hg_branch` module shows the active branch of the repo in your current directory.