support pycairo (#178)

* support pycairo

* merge pycairo example with system deps

core/__snapshots__/TestGenerateBuildPlanForExamples_python-system-deps_1.snap.json

@@ -63,8 +63,8 @@
    ],
    "commands": [
     {
-     "cmd": "sh -c 'apt-get update \u0026\u0026 apt-get install -y libpq-dev python3-dev'",
-     "customName": "install apt packages: libpq-dev python3-dev"
+     "cmd": "sh -c 'apt-get update \u0026\u0026 apt-get install -y libcairo2-dev libpq-dev python3-dev'",
+     "customName": "install apt packages: libcairo2-dev libpq-dev python3-dev"
     }
    ],
    "inputs": [
@@ -170,8 +170,8 @@
    ],
    "commands": [
     {
-     "cmd": "sh -c 'apt-get update \u0026\u0026 apt-get install -y ffmpeg libpq5 poppler-utils'",
-     "customName": "install apt packages: ffmpeg libpq5 poppler-utils"
+     "cmd": "sh -c 'apt-get update \u0026\u0026 apt-get install -y ffmpeg libcairo2 libpq5 poppler-utils'",
+     "customName": "install apt packages: ffmpeg libcairo2 libpq5 poppler-utils"
     }
    ],
    "inputs": [

core/providers/python/python.go

@@ -260,7 +260,7 @@ func (p *PythonProvider) InstallPip(ctx *generate.GenerateContext, install *gene
 func (p *PythonProvider) AddRuntimeDeps(ctx *generate.GenerateContext) {
 	for dep, requiredPkgs := range pythonRuntimeDepRequirements {
 		if p.usesDep(ctx, dep) {
-			ctx.Logger.LogInfo("Installing apt packages for %s", dep)
+			ctx.Logger.LogInfo("Installing runtime apt packages for %s", dep)
 			ctx.Deploy.AddAptPackages(requiredPkgs)
 		}
 	}
@@ -278,6 +278,13 @@ func (p *PythonProvider) GetBuilderDeps(ctx *generate.GenerateContext) *generate
 	miseStep := ctx.GetMiseStepBuilder()
 	miseStep.SupportingAptPackages = append(miseStep.SupportingAptPackages, "python3-dev")
 
+	for dep, requiredPkgs := range pythonBuildDepRequirements {
+		if p.usesDep(ctx, dep) {
+			ctx.Logger.LogInfo("Installing build apt packages for %s", dep)
+			miseStep.SupportingAptPackages = append(miseStep.SupportingAptPackages, requiredPkgs...)
+		}
+	}
+
 	if p.usesPostgres(ctx) {
 		miseStep.SupportingAptPackages = append(miseStep.SupportingAptPackages, "libpq-dev")
 	}
@@ -470,7 +477,13 @@ func (p *PythonProvider) getRuntime(ctx *generate.GenerateContext) string {
 }
 
 // Mapping of python dependencies to required apt packages
+
+var pythonBuildDepRequirements = map[string][]string{
+	"pycairo": {"libcairo2-dev"},
+}
+
 var pythonRuntimeDepRequirements = map[string][]string{
+	"pycairo":   {"libcairo2"},
 	"pdf2image": {"poppler-utils"},
 	"pydub":     {"ffmpeg"},
 	"pymovie":   {"ffmpeg", "qt5-qmake", "qtbase5-dev", "qtbase5-dev-tools", "qttools5-dev-tools", "libqt5core5a", "python3-pyqt5"},

examples/python-system-deps/main.py

@@ -1,6 +1,7 @@
 from pdf2image import convert_from_path, convert_from_bytes
 from pydub import AudioSegment
 from pydub.playback import play
+import cairo
 
 # pdf2image
 images = convert_from_path('./test.pdf')
@@ -10,5 +11,9 @@ print(images)
 sound = AudioSegment.from_file("test.mp3", format="mp3")
 print(sound)
 
+# pycairo
+surface = cairo.SVGSurface("example.svg", 200, 200)
+print(surface)
+print("PyCairo version:", cairo.version)
 
 print("Hello from Python with system deps")

examples/python-system-deps/requirements.txt

@@ -1,4 +1,4 @@
 psycopg2-binary==2.9.10
 pdf2image==1.0.0
 pydub==0.25.1
-# pycairo==1.27.0
+pycairo==1.27.0

examples/python-system-deps/test.json

@@ -0,0 +1,5 @@
+[
+  {
+    "expectedOutput": "Hello from Python with system deps"
+  }
+]