[Instruction] Slightly update steps of BUILD_ON_WINDOWS.md

1. doc\BUILD_ON_WINDOWS.md
  - rustup.exe with parameter to install rust without prompt
2. frontend/scripts/makefile/protobuf.toml
  - add a sub task to check if protoc is presented in PATH

doc/BUILD_ON_LINUX.md

@@ -21,7 +21,7 @@ Note:
 * You may need to disable hardware 3D acceleration if you are running it on a VM. Otherwise, certain GL failures will prevent app from launching
 
 ### Detail steps
-1. Install prerequisites 
+1. Install prerequisites
 ```shell
 sudo apt-get install curl build-essential libsqlite3-dev libssl-dev clang cmake ninja-build pkg-config libgtk-3-dev unzip
 # optional, for generating protobuf in step 8 only
@@ -35,7 +35,7 @@ rustup toolchain install nightly
 rustup default nightly
 ```
 
-3. env settings 
+3. env settings
 ``` shell
 cp backend/configuration/base.example.yaml backend/configuration/base.yaml
 cp backend/configuration/.env.example backend/configuration/.env
@@ -64,13 +64,14 @@ cargo install --force cargo-make
 ```shell
 cargo install --force duckscript_cli
 ```
-8. Check pre-request
+8. Check prerequisites
 ```shell
 cargo make flowy_dev
 ```
 
 9. [Optional] Generate protobuf for dart (optional, if you modify the shared-lib's entities)
 ```shell
+# Make sure to install protobuf-compiler at first. See step 1
 cargo make -p development-linux-x86 pb
 ```
 10. [Optional] Build flowy-sdk-dev (dart-ffi), step 10 covers this step

doc/BUILD_ON_WINDOWS.md

@@ -11,7 +11,7 @@ git clone https://github.com/AppFlowy-IO/appflowy.git
 ------------------------------
 
 Note:
-* Please run the commands in windows cmd rather than powershell
+* Both Windows cmd and powershell can be used for running commands
 * Following steps are verified on
     - [x] Windows 10 X86_64
     - [ ] Windows 10 arm64
@@ -32,7 +32,8 @@ flutter doctor
 ```shell
 # Download rustup.exe from https://win.rustup.rs/x86_64
 # Call rustup.exe from powershell or cmd
-rustup.exe toolchain install nightly
+.\rustup-init.exe --default-toolchain nightly --default-host x86_64-pc-windows-msvc -y
+# Note: you probably need to re-open termial to get cargo command be available in PATH var
 ```
 5. Install cargo make
 ```shell
@@ -43,15 +44,17 @@ cargo install --force cargo-make
 ```shell
 cargo install --force duckscript_cli
 ```
-7. Check pre-request
+7. Check prerequisites
 ```shell
 cargo make flowy_dev
 ```
 8. [Optional] Generate protobuf for dart (optional, if you modify the shared-lib's entities)
 ```shell
+# Need to download protoc tools and add it's bin folder into PATH env var.
+# Download protoc from https://github.com/protocolbuffers/protobuf/releases. The latest one is protoc-3.19.1-win64.zip
 cargo make -p development-windows pb
 ```
-9. [Optional] Build flowy-sdk (dart-ffi)
+9. [Optional] Build flowy-sdk (dart-ffi), step 10 covers this step
 ```shell
 # for development
 cargo make --profile development-windows-x86 flowy-sdk-dev
@@ -66,7 +69,7 @@ cargo make -p development-windows-x86 appflowy-windows-dev
 cargo make -p production-windows-x86 appflowy-windows
 ```
 
-## Step 3: Build Server side application (optional if you don't need to host web service locally)
+## [Optional] Step 3: Build Server side application (optional if you don't need to host web service locally)
 ------------------------------
 
 Note: You can launch postgresql server by using docker container

frontend/scripts/makefile/protobuf.toml

@@ -1,6 +1,19 @@
 
 [tasks.pb]
-dependencies = ["gen_pb_file"]
+dependencies = ["check_protoc_cmd", "gen_pb_file"]
+
+[tasks.check_protoc_cmd]
+script = [
+    """
+    ret = which protoc
+    if is_empty ${ret}
+        echo Please make sure <protoc_installation_folder>/bin/ is in PATH env var
+        echo See BUILD_ON_{LINUX|WINDOWS}.md for how to get protoc
+        exit -1
+    end
+    """,
+]
+script_runner = "@duckscript"
 
 [tasks.gen_pb_file]
 script = [
@@ -30,7 +43,7 @@ script = [
     flowy_tool=set ${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/scripts/flowy-tool/Cargo.toml
     rust_source=set ${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/rust-lib/
     # rust_lib=set ${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/rust-lib
-    shared_lib=${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/../shared-lib
+    shared_lib=set ${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/../shared-lib
     flutter_lib=set ${CARGO_MAKE_WORKSPACE_WORKING_DIRECTORY}/app_flowy/packages
 
     derive_meta=set ${shared_lib}/flowy-derive/src/derive_cache/derive_cache.rs