feat: add support for swift projects

Add support for swift projects using swift package manager (SPM).

The 'swift-spm symbol is qualified to leave room for other flavors of
swift project that are more Xcode oriented or use cocoapods.

Author: Peter Grayson

CHANGELOG.md

@@ -14,6 +14,7 @@
 * [#1899](https://github.com/bbatsov/projectile/pull/1899): Add support for xmake build utility.
 * [#1895](https://github.com/bbatsov/projectile/pull/1895): Modify projectile-mode to add a hook to `buffer-list-update-hook` such that any change in the buffer list will update the selected project.
 * [#1918](https://github.com/bbatsov/projectile/pull/1895): Add Zig project discovery.
+* Add support for Swift project discovery.
 
 ### Bugs fixed
 

doc/modules/ROOT/pages/projects.adoc

@@ -269,6 +269,10 @@ are the configuration files of various build tools. Out of the box the following
 | Zig
 | `build.zig.zon`
 | Zig project file
+
+| Swift
+| `Package.swift`
+| Swift package file
 |===
 
 There's also Projectile's own `.projectile` which serves both as a project marker

projectile.el

@@ -3633,6 +3633,13 @@ a manual COMMAND-TYPE command is created with
                                   :test "zig build test"
                                   :run "zig build run")
 
+;; Swift
+(projectile-register-project-type 'swift-spm '("Package.swift")
+                                  :project-file "Package.swift"
+                                  :compile "swift build"
+                                  :test "swift test"
+                                  :run "swift run")
+
 (defvar-local projectile-project-type nil
   "Buffer local var for overriding the auto-detected project type.
 Normally you'd set this from .dir-locals.el.")