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 "