Python script flask sample (#116)

* not working

* python script sample not working flask

* fixed script working

* added runner script

* readme

* remove folder

* revert readme

* added gitignore for py files

* remove app.py

* change script

* change readme

examples/scripts/.gitignore

@@ -0,0 +1,4 @@
+_packagemanagement
+*.py
+requirements.txt
+fable_modules

examples/scripts/README.md

@@ -0,0 +1,25 @@
+# Compile and Run a Python Script
+
+```
+dotnet tool restore
+```
+
+then run
+
+```
+dotnet fsi run_flask_app.fsx flask_sample.fsx
+```
+
+this will run using `pip-run` for now requirements.txt manual file is supported but inference via `pipreqs` is not working as expected.
+
+## python dependencies
+
+* python3
+* pip
+* `pipx` > required, used to install global python packages. DEPENDENCY, [install instructions here](https://pipx.pypa.io/stable/) or for mac via brew.
+* `pipreqs` for package requiremnts inference : `pipx install pipreqs` will be executed. (not working yet)
+* `pip-run` for running with defualt one shot option, which runs your script one time in a temp env (can be installed with pipx), `pipx install pip-run` will be executed
+
+## pip-run
+
+* [pip-run](https://github.com/jaraco/pip-run/blob/main/README.rst) is used to run all script in "isolation" taking care of creatinv venv and installing libs in temp dirs and removing them after execution

examples/scripts/flask_sample.fsx

@@ -0,0 +1,88 @@
+#r "nuget: Fable.Core"
+#r "nuget: Fable.Python"
+#r "nuget: Feliz.ViewEngine"
+#r "nuget: Zanaptak.TypedCssClasses"
+// #r "nuget: Fli"
+open Fable.Python.Builtins
+open Feliz.ViewEngine
+open Zanaptak.TypedCssClasses
+
+// PIP: flask
+open Fable.Python.Flask
+
+type Bulma = CssClasses<"https://cdnjs.cloudflare.com/ajax/libs/bulma/0.9.3/css/bulma.min.css", Naming.PascalCase>
+
+module View =
+    let title (str: string) = Html.p [ prop.classes [ Bulma.Title ]; prop.text str ]
+    let subTitle (str: string) = Html.p [ prop.classes [ Bulma.Subtitle ]; prop.text str ]
+
+    let model = {|
+            Title="Fable Python |> F# ♥️ Python"
+            Description="Demo Website, Fable Python running on Flask!"
+            Banner="https://unsplash.it/1200/900?random"
+            PermaLink="https://fable.io"
+            Author="[email protected]"
+            Brand="public/favicon.png"
+        |}
+
+    let head =
+        Html.head [
+            Html.title [ prop.text model.Title ]
+
+            Html.meta [ prop.charset.utf8 ]
+            Html.meta [ prop.name "author"; prop.content model.Author ]
+            Html.meta [ prop.name "description"; prop.content model.Description ]
+
+            Html.meta [ prop.httpEquiv.contentType; prop.content "text/html"; prop.charset.utf8 ]
+            Html.meta [ prop.name "viewport"; prop.content "width=device-width, initial-scale=1" ]
+
+            Html.meta [
+                prop.custom ("http-equiv", "Cache-Control")
+                prop.content "no-cache, no-store, must-revalidate"
+            ]
+            Html.meta [ prop.custom ("http-equiv", "Pragma"); prop.content "no-cache" ]
+            Html.meta [ prop.custom ("http-equiv", "Expires"); prop.content "0" ]
+
+            Html.link [ prop.rel "icon"; prop.href "public/favicon.ico" ]
+            Html.link [ prop.rel "stylesheet"; prop.href "https://cdnjs.cloudflare.com/ajax/libs/bulma/0.9.3/css/bulma.min.css"; prop.crossOrigin.anonymous ]
+        ]
+
+    let body = Html.div [
+        title model.Title
+        subTitle model.Description
+    ]
+
+    let section =
+        Html.section [
+            prop.classes [ Bulma.Hero; Bulma.IsFullheightWithNavbar ]
+            prop.style [
+                style.backgroundImageUrl (model.Banner)
+                style.backgroundPosition "center"
+                style.backgroundSize.cover
+            ]
+            prop.children [
+                Html.div [
+                    prop.classes [ Bulma.HeroBody; Bulma.IsDark ]
+                    prop.children [ Html.div [ prop.classes [ Bulma.Container ]; prop.children body ] ]
+                ]
+            ]
+        ]
+
+    let html =
+        Html.html [
+            head 
+            Html.body [
+                section
+            ]
+        ]
+
+let renderView () =
+    View.html |> Render.htmlDocument
+
+// NB: this must not be inside a module for Flask to resolve the app correctly!
+// https://stackoverflow.com/questions/57718786/error-launching-flask-app-with-error-failed-to-find-flask-application
+let app = Flask.Create(__name__, "/public")
+
+// Setup the routes. See if we can use attributes instead
+app.route("/")(renderView) |> ignore
+

examples/scripts/run_flask_app.fsx

@@ -0,0 +1,228 @@
+// dotnet fsi run_flask_app flask_sample.fsx [--global](to uses pip-run and venv by default)
+#r "nuget: Fli"
+#r "nuget: EluciusFTW.SpectreCoff"
+//we can use this package to run python commands together with the script
+open Fli
+open SpectreCoff
+
+"Python + F#" |> figlet |> toConsole
+
+// using vscode F# highlight ext can also execute inline python 
+let python (p : string)= p
+
+let create_py_venv () =
+    cli {
+        Shell Shells.BASH
+        Command ("python3 -m venv .venv")
+    }
+    |> Command.execute
+    |> Output.printText
+
+let install_pip_run_package() =
+    "install pip-run" |> C |> toConsole
+    cli {
+        Shell Shells.BASH
+        Command ("pipx install pip-run")
+    }
+    |> Command.execute
+    |> Output.printText
+
+
+let isGlobal  = 
+    match fsi.CommandLineArgs |> Seq.toList with
+    |_::_::"--global"::[] -> true
+    |_::"--global"::_ -> true
+    |_ -> false
+
+let install_pipreqs_package() =
+    "install pipreqs" |> C |> toConsole
+    cli {
+        Shell Shells.BASH
+        Command ("pipx install pipreqs")
+    }
+    |> Command.execute
+    |> Output.printText
+
+// FAILS...
+let gen_pip_requirements_file() =
+    "execute pipreqs to generate requirements.txt" |> C |> toConsole
+    cli {
+        Shell Shells.BASH
+        Command ("python3 -m pipreqs .")
+    }
+    |> Command.execute
+    |> Output.throwIfErrored
+    |> Output.printText
+
+let create_requirements() = 
+    cli {
+        Shell Shells.BASH
+        Command ("touch requirements.txt")
+    }
+    |> Command.execute
+    |> Output.printText
+
+let gen_pip_requirements_file_local() =
+    "execute local pipreqs to generate requirements.txt" |> C |> toConsole
+    cli {
+        Shell Shells.BASH
+        Command ("pipreqs .")
+    }
+    |> Command.execute
+    |> Output.throwIfErrored
+    |> Output.printText
+
+let install_pip_requirements() =
+    "pip install requirements.txt" |> C |> toConsole
+    cli {
+        Shell Shells.BASH
+        Command ("python3 -m pip install -r requirements.txt ")
+    }
+    |> Command.execute
+    |> Output.throwIfErrored
+    |> Output.printText
+
+let activate_py_venv () =
+    cli {
+        Shell Shells.BASH
+        Command ("source .venv/bin/activate")
+    }
+    |> Command.execute
+    |> Output.throwIfErrored
+    |> Output.printText
+
+let which_python () =
+    cli {
+        Shell Shells.BASH
+        Command ("which python")
+    }
+    |> Command.execute
+    |> Output.printText
+
+
+/// pip install flask
+let pip_install_flask() = 
+    cli {
+        Shell Shells.BASH
+        Command ("python3 -m pip install flask")
+    }
+    |> Command.execute
+    |> Output.printText
+
+/// pip install extra dependencies if needed, specify them as extra arg ',' separated
+let pip_install_extras() = 
+    let dependencies = 
+        match fsi.CommandLineArgs |> Seq.toList with
+        |_::_::trd::[] -> trd.Split(",")
+        |_ -> [||]
+
+    for dep in dependencies do 
+        cli {
+            Shell Shells.BASH
+            Command ($"python3 -m pip install {dep}")
+        }
+        |> Command.execute
+        |> Output.printText
+
+let fable_compile_flask_app() =
+    "FABLE" |> figlet |> toConsole
+
+    let flaskScriptName = 
+        printfn $"args: {fsi.CommandLineArgs}"
+        match fsi.CommandLineArgs |> Seq.toList with
+        |_::snd::[] -> snd
+        |_ -> "app.fsx" 
+
+    cli {
+        Shell Shells.BASH
+        Command ($"dotnet tool restore && dotnet fable {flaskScriptName} --lang Python --noCache")
+    }
+    |> Command.execute
+    |> Output.throwIfErrored
+    |> Output.printText
+
+let remove_old_app() = 
+    "rm app.py" |> C |> toConsole
+    cli {
+        Shell Shells.BASH
+        Command "rm app.py"
+    }
+    |> Command.execute
+    |> Output.throwIfErrored
+    |> Output.printText
+
+let rename_and_cleanup() = 
+    "rename latest script to app.py" |> C |> toConsole
+    cli {
+        Shell Shells.BASH
+        Command "mv *.py app.py"
+    }
+    |> Command.execute
+    |> Output.throwIfErrored
+    |> Output.printText
+
+let deactivate_py_venv() =
+    cli {
+        Shell Shells.BASH
+        Command ("python3 -m deactivate")
+    }
+    |> Command.execute
+    |> Output.printText
+
+let run_flask_app() =
+    try
+        "starting app to listen on http://127.0.0.1:5000" |> P |> toConsole
+        cli {
+            Shell Shells.BASH
+            Command ("python3 -m flask run")
+        }
+        |> Command.execute
+        |> Output.throwIfErrored 
+        |> ignore 
+    with ex -> 
+        printfn $"script exited with code {ex.Message}"
+        ()
+
+let one_shot_run_flask_app() =
+    try
+        "starting ONE-SHOT app to listen on http://127.0.0.1:5000" |> P |> toConsole
+        cli {
+            Shell Shells.BASH
+            Command ("pip-run flask -r requirements.txt -- -m flask run")
+        }
+        |> Command.execute
+        |> Output.throwIfErrored 
+        |> ignore 
+    with ex -> 
+        $"script exited with code {ex.Message}" |> P |> toConsole
+        ()
+
+
+let isVenv  = 
+    match fsi.CommandLineArgs |> Seq.toList with
+    |_::_::"--venv"::[] -> true
+    |_::"--venv"::_ -> true
+    |_ -> false
+
+// execution
+
+if isVenv then
+    create_py_venv()
+    |> activate_py_venv
+    |> which_python
+    printfn "remember to run deactivate at the end of the script, or which python"
+
+//install_pipreqs_package()
+//|> if isGlobal then gen_pip_requirements_file else gen_pip_requirements_file_local
+()
+|> create_requirements
+|> if isGlobal then id else install_pip_run_package
+|> fable_compile_flask_app
+|> remove_old_app
+|> rename_and_cleanup
+|> if isGlobal then run_flask_app else one_shot_run_flask_app
+
+// need a strategy to not break on CTRL-C for this...
+// maybe use `fg` ?
+// |> deactivate_py_venv
+// |> which_python