Use SwiftFormat from develop and enabled indent-blank-lines option.

.swiftformat

@@ -12,6 +12,7 @@
 --commas inline
 --ifdef no-indent
 --indent 4
+--indent-blank-lines enabled
 --nospaceoperators ...,..<
 --stripunusedargs closure-only
 --trimwhitespace nonblank-lines

Tools/Sources/Commands/SetupProject.swift

@@ -17,7 +17,10 @@ struct SetupProject: ParsableCommand {
     }
 
     func brewInstall() throws {
-        try Zsh.run(command: "brew install xcodegen swiftgen swiftformat git-lfs sourcery mint pkl kiliankoe/formulae/swift-outdated localazy/tools/localazy peripheryapp/periphery/periphery")
+        try Zsh.run(command: "brew install xcodegen swiftgen git-lfs sourcery mint pkl kiliankoe/formulae/swift-outdated localazy/tools/localazy peripheryapp/periphery/periphery")
+        
+        // Install swiftformat from develop (for now), making sure to avoid conflicts with an existing versioned installation. 
+        try Zsh.run(command: "source ci_scripts/ci_common.sh && install_swiftformat_head")
     }
 
     func mintPackagesInstall() throws {

ci_scripts/ci_common.sh

@@ -15,7 +15,15 @@ setup_github_actions_environment() {
     unset HOMEBREW_NO_INSTALL_FROM_API
     export HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK=1
     
-    brew update && brew install xcodegen swiftlint swiftformat git-lfs pkl a7ex/homebrew-formulae/xcresultparser
+    brew update && brew install xcodegen swiftlint git-lfs pkl a7ex/homebrew-formulae/xcresultparser
+    install_swiftformat_head
+}
+
+install_swiftformat_head() {
+    if brew list --versions swiftformat &>/dev/null && ! brew list --versions swiftformat | grep -q HEAD; then
+        brew uninstall swiftformat
+    fi
+    brew install swiftformat --HEAD
 }
 
 setup_github_actions_translations_environment() {