Add support for SwiftPM using SPMCLI

SPMCLI is an option since to compile SwiftGit2 we need to perform amounts of linking and passing flags during compilation which in turns very cumbersome. The other way is to use helper like Make or other automation.

SPMCLI is choosen because it supports resolving configuration in dependencies. For now, ZipArchive. The user doesn't need to manually state each updated link and flags because SPMCLI will handle it.

.gitignore

@@ -1,3 +1,4 @@
+SPMGenerated.xcodeproj
 .vscode/
 .build/
 

Clibgit2/_stub.c

@@ -0,0 +1 @@
+// Avoid warning in SwiftPM invocation.

MacOS.xcconfig

@@ -0,0 +1,2 @@
+OTHER_LDFLAGS	=	$(inherited) ./External/libgit2.a ./External/libssl.a ./External/libcrypto.a /usr/lib/libcurl.dylib /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libz.tbd /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libiconv.tbd 
+OTHER_CFLAGS	=	$(inherited) -DHAVE_INTTYPES_H -DHAVE_PKCRYPT -DHAVE_STDINT_H -DHAVE_WZAES -DHAVE_ZLIB -DMZ_ZIP_NO_SIGNING -Wnon-modular-include-in-framework-module -Werror=non-modular-include-in-framework-module -fapplication-extension -Wno-trigraphs -fpascal-strings -O0 -fno-common -Wno-missing-field-initializers -Wno-missing-prototypes -Werror=return-type -Wunreachable-code-aggressive -Werror=deprecated-objc-isa-usage -Werror=objc-root-class -Wno-missing-braces -Wparentheses -Wswitch -Wunused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wempty-body -Wuninitialized -Wconditional-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wconstant-conversion -Wint-conversion -Wbool-conversion -Wenum-conversion -Wno-float-conversion -Wnon-literal-null-conversion -Wobjc-literal-conversion -Wshorten-64-to-32 -Wpointer-sign -Wno-newline-eof -fstrict-aliasing -Wdeprecated-declarations -g -Wno-sign-conversion -Winfinite-recursion -Wcomma -Wblock-capture-autoreleasing -Wstrict-prototypes -Wno-semicolon-before-method-body 

Package.resolved

@@ -0,0 +1,34 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "Nimble",
+        "repositoryURL": "https://github.com/Quick/Nimble",
+        "state": {
+          "branch": null,
+          "revision": "e9d769113660769a4d9dd3afb855562c0b7ae7b0",
+          "version": "7.3.4"
+        }
+      },
+      {
+        "package": "Quick",
+        "repositoryURL": "https://github.com/Quick/Quick",
+        "state": {
+          "branch": null,
+          "revision": "f2b5a06440ea87eba1a167cab37bf6496646c52e",
+          "version": "1.3.4"
+        }
+      },
+      {
+        "package": "ZipArchive",
+        "repositoryURL": "https://github.com/muizidn/ZipArchive",
+        "state": {
+          "branch": "master",
+          "revision": "403986421556d945ce28b64bfc171e4ff9403a37",
+          "version": null
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

@@ -0,0 +1,42 @@
+// swift-tools-version:5.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "SwiftGit2",
+    platforms: [
+      .macOS(.v10_11),
+    ],
+    products: [
+        .executable(
+            name: "example",
+            targets: ["example"]),
+        .library(
+            name: "SwiftGit2",
+            targets: ["SwiftGit2"]),
+    ],
+    dependencies: [
+		.package(url: "https://github.com/Quick/Quick", from: "1.3.2"),
+		.package(url: "https://github.com/Quick/Nimble", from: "7.3.1"),
+		.package(url: "https://github.com/muizidn/ZipArchive", .branch("master")),
+    ],
+    targets: [
+        .target(
+            name: "example",
+            dependencies: ["SwiftGit2"],
+            path: "example"),
+        .target(
+            name: "SwiftGit2",
+            dependencies: ["Clibgit2"],
+			path: "SwiftGit2",
+            sources: ["Swift"]),
+        .target(
+            name: "Clibgit2",
+            path: "Clibgit2"),
+        .testTarget(
+			name: "SwiftGit2Tests",
+			dependencies: ["SwiftGit2", "Quick", "Nimble", "ZipArchive"],
+			path: "SwiftGit2Tests"),
+    ]
+)

README.md

@@ -62,6 +62,13 @@ If you want to build a copy of SwiftGit2 without Carthage, possibly for developm
 2. Run `git submodule update --init --recursive` to clone the submodules
 3. Build in Xcode
 
+## Swift Package Manager
+To incorporate SwiftGit2 to your project, you may want to use [SPMCLI](https://github.com/pondok-programmer/spmcli) to automate tedious tasks including linking and passing flags.
+
+We encourage you to check [SPMCLI.resolved](SPMCLI.resolved) file.
+
+To generate Xcodeproj using SPMCLI, you need to use it's `xcproj` branch. It will automate set up OTHER_CFLAGS and OTHER_LDFLAGS.
+
 ## Contributions
 We :heart: to receive pull requests! GitHub makes it easy:
 

SPMCLI.resolved

@@ -0,0 +1,63 @@
+mac:
+  build:
+    -Xcc:
+    - -DHAVE_INTTYPES_H
+    - -DHAVE_PKCRYPT
+    - -DHAVE_STDINT_H
+    - -DHAVE_WZAES
+    - -DHAVE_ZLIB
+    - -DMZ_ZIP_NO_SIGNING
+    - -Wnon-modular-include-in-framework-module
+    - -Werror=non-modular-include-in-framework-module
+    - -fapplication-extension
+    - -Wno-trigraphs
+    - -fpascal-strings
+    - -O0
+    - -fno-common
+    - -Wno-missing-field-initializers
+    - -Wno-missing-prototypes
+    - -Werror=return-type
+    - -Wunreachable-code-aggressive
+    - -Werror=deprecated-objc-isa-usage
+    - -Werror=objc-root-class
+    - -Wno-missing-braces
+    - -Wparentheses
+    - -Wswitch
+    - -Wunused-function
+    - -Wno-unused-label
+    - -Wno-unused-parameter
+    - -Wunused-variable
+    - -Wunused-value
+    - -Wempty-body
+    - -Wuninitialized
+    - -Wconditional-uninitialized
+    - -Wno-unknown-pragmas
+    - -Wno-shadow
+    - -Wno-four-char-constants
+    - -Wno-conversion
+    - -Wconstant-conversion
+    - -Wint-conversion
+    - -Wbool-conversion
+    - -Wenum-conversion
+    - -Wno-float-conversion
+    - -Wnon-literal-null-conversion
+    - -Wobjc-literal-conversion
+    - -Wshorten-64-to-32
+    - -Wpointer-sign
+    - -Wno-newline-eof
+    - -fstrict-aliasing
+    - -Wdeprecated-declarations
+    - -g
+    - -Wno-sign-conversion
+    - -Winfinite-recursion
+    - -Wcomma
+    - -Wblock-capture-autoreleasing
+    - -Wstrict-prototypes
+    - -Wno-semicolon-before-method-body
+    -Xlinker:
+    - ./External/libgit2.a
+    - ./External/libssl.a
+    - ./External/libcrypto.a
+    - /usr/lib/libcurl.dylib
+    - /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libz.tbd
+    - /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libiconv.tbd

SPMCLI.yaml

@@ -0,0 +1,13 @@
+mac:
+  build:
+    -Xlinker:
+      - ${PWD}/External/libgit2.a
+      - ${PWD}/External/libssl.a
+      - ${PWD}/External/libcrypto.a
+      - /usr/lib/libcurl.dylib
+
+xcconfig:
+  name: MacOS.xcconfig
+  keys:
+    OTHER_LDFLAGS: -Xlinker
+    OTHER_CFLAGS: -Xcc

example/main.swift

@@ -0,0 +1 @@
+import SwiftGit2