refactor: ⚡️ Add export file by default (#144)

README.md

@@ -72,6 +72,7 @@ No prerequisites are needed for macOS.
 git clone https://github.com/esp-rs/rust-build.git
 cd rust-build
 ./install-rust-toolchain.sh
+. export-esp.sh
 ```
 
 Run `./install-rust-toolchain.sh --help` for more information about arguments.
@@ -83,16 +84,16 @@ Export variables are displayed at the end of the script.
 Installation of different version of the toolchain:
 
 ```
-./install-rust-toolchain.sh --toolchain-version 1.64.0.0 --export-file export-esp-rust.sh
-source export-esp-rust.sh
+./install-rust-toolchain.sh --toolchain-version 1.64.0.0
+. export-esp.sh
 ```
 
 #### Arguments
 - `-b|--build-target`: Comma separated list of targets [`esp32,esp32s2,esp32s3,esp32c3,all`]. Defaults to: `esp32,esp32s2,esp32s3`
 - `-c|--cargo-home`: Cargo path.
 - `-d|--toolchain-destination`: Toolchain instalation folder. Defaults to: `<rustup_home>/toolchains/esp`
 - `-e|--extra-crates`: Extra crates to install. Defaults to: `ldproxy cargo-espflash`
-- `-f|--export-file`: Destination of the export file generated.
+- `-f|--export-file`: Destination of the export file generated. Defaults to: `export-esp.sh`
 - `-i|--installation-mode`: Installation mode: [`install, reinstall, uninstall`]. Defaults to: `install`
 - `-k|--minified-llvm`: Use minified LLVM. Possible values: [`YES, NO`]. Defaults to: `YES`
 - `-l|--llvm-version`: LLVM version.

install-rust-toolchain.sh

@@ -25,7 +25,7 @@ ESP_IDF_VERSION=""
 MINIFIED_ESP_IDF="NO"
 IS_XTENSA_INSTALLED=0
 SYSTEM_PACKAGES="openssl@3"
-EXPORT_FILE=""
+EXPORT_FILE="export-esp.sh"
 
 display_help() {
     echo "Usage: install-rust-toolchain.sh <arguments>"
@@ -34,7 +34,7 @@ display_help() {
     echo "-c|--cargo-home                 Cargo path"
     echo "-d|--toolchain-destination      Toolchain installation folder."
     echo "-e|--extra-crates               Extra crates to install. Defaults to: ldproxy cargo-espflash"
-    echo "-f|--export-file                Destination of the export file generated."
+    echo "-f|--export-file                Destination of the export file generated. Defaults to: export-esp.sh"
     echo "-i|--installation-mode          Installation mode: [install, reinstall, uninstall]. Defaults to: install"
     echo "-k|--minified-llvm              Use minified LLVM. Possible values [YES, NO]"
     echo "-l|--llvm-version               LLVM version"