Add Commit hook install script (duckduckgo#1845)

Task URL: https://app.asana.com/0/1200194497630846/1205110674679790/f

Descrption:

Adds a script that allows us to automatically install a pre-commit hook that runs swiftlint --fix

The original installation script lives in BSK for easier maintenance. App Scripts download it and install it locally. (Remote URL will be updated once we merge BSK. This script can be extended as necesary to install/manage additional pre-commit hooks

Author: afterxleep

DuckDuckGo.xcodeproj/project.pbxproj

@@ -5781,7 +5781,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if [[ -n \"$CI\" ]] || [[ -n \"$BITRISE_IO\" ]]; then\n    echo \"Skipping SwiftLint run in CI\"\n    exit 0\nfi\n\nif test -d \"/opt/homebrew/bin/\"; then\n    PATH=\"/opt/homebrew/bin/:${PATH}\"\nfi\n\nif test -d \"$HOME/.mint/bin/\"; then\n    PATH=\"$HOME/.mint/bin/:${PATH}\"\nfi\n\nexport PATH\n\nif which swiftlint >/dev/null; then\n   if [ \"$CONFIGURATION\" = \"Release\" ]; then\n       swiftlint lint --strict\n       if [ $? -ne 0 ]; then\n           echo \"error: SwiftLint validation failed.\"\n           exit 1\n       fi\n   else\n       swiftlint lint\n   fi\nelse\n   echo \"error: SwiftLint not installed. Install using \\`brew install swiftlint\\`\"\n   exit 1\nfi\n";
+			shellScript = "./lint.sh\n";
 		};
 		98B0CE69251C937D003FB601 /* Update Localizable.strings */ = {
 			isa = PBXShellScriptBuildPhase;

lint.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+
+FIX=false
+
+if [[ "$1" == "--fix" ]]; then
+    FIX=true
+fi
+
+if [[ -n "$CI" ]] || [[ -n "$BITRISE_IO" ]]; then
+    echo "Skipping SwiftLint run in CI"
+    exit 0
+fi
+
+# Add brew into PATH
+if [[ -f /opt/homebrew/bin/brew ]]; then
+    eval $(/opt/homebrew/bin/brew shellenv)
+fi
+
+if test -d "$HOME/.mint/bin/"; then
+    PATH="$HOME/.mint/bin/:${PATH}"
+fi
+
+export PATH
+
+
+SWIFTLINT_COMMAND="swiftlint lint"
+if $FIX; then
+    SWIFTLINT_COMMAND="swiftlint lint --fix"
+fi
+
+if which swiftlint >/dev/null; then
+   if [ "$CONFIGURATION" = "Release" ]; then
+       $SWIFTLINT_COMMAND --strict
+       if [ $? -ne 0 ]; then
+           echo "error: SwiftLint validation failed."
+           exit 1
+       fi
+   else
+       $SWIFTLINT_COMMAND
+   fi
+else
+   echo "error: SwiftLint not installed. Install using \`brew install swiftlint\`"
+   exit 1
+fi

scripts/pre-commit.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+SCRIPT_URL="https://raw.githubusercontent.com/duckduckgo/BrowserServicesKit/main/scripts/pre-commit.sh"
+curl -s "${SCRIPT_URL}" | bash -s -- "$@"