ci: Consolidate "Install WABT" commands

circle.yml

@@ -30,6 +30,20 @@ commands:
           name: "Install system dependencies"
           command: HOMEBREW_NO_AUTO_UPDATE=1 HOMEBREW_NO_INSTALL_CLEANUP=1 brew install cmake ninja
 
+  install_wabt:
+    description: "Install WABT tools"
+    steps:
+      - run:
+          name: "Install WABT tools"
+          command: |
+            if type wast2json; then
+              wast2json --version
+            else
+              [[ $OSTYPE = darwin* ]] && os=macos || os=ubuntu
+              cd /usr/local
+              curl -L https://github.com/WebAssembly/wabt/releases/download/1.0.19/wabt-1.0.19-$os.tar.gz | sudo tar xz --strip 1
+            fi
+
   build:
     description: "Build"
     parameters:
@@ -149,16 +163,7 @@ commands:
         default: 477
 
     steps:
-      - run:
-          name: "Install WABT"
-          command: |
-            if type wast2json; then
-              wast2json --version
-            else
-              [[ $OSTYPE = darwin* ]] && os=macos || os=ubuntu
-              cd /usr/local
-              curl -L https://github.com/WebAssembly/wabt/releases/download/1.0.19/wabt-1.0.19-$os.tar.gz | sudo tar xz --strip 1
-            fi
+      - install_wabt
       - run:
           name: "Download spectest files"
           working_directory: ~/build
@@ -168,7 +173,6 @@ commands:
               mkdir json && cd json
               find ../wasm-spec/test/core -name '*.wast' -exec wast2json {} \;
             fi
-
       - run:
           name: "Run spectest<<#parameters.skip_validation>> (skip validation)<</parameters.skip_validation>>"
           working_directory: ~/build
@@ -195,14 +199,10 @@ jobs:
         name: "Run codespell"
         command: |
           codespell --quiet-level=4 -I .codespell-whitelist
-    - run:
-        name: "Install wabt"
-        working_directory: ~/bin
-        command: curl -L https://github.com/WebAssembly/wabt/releases/download/1.0.15/wabt-1.0.15-linux.tar.gz | tar xz --strip=1
+    - install_wabt
     - run:
         name: "Check wat2wasm4cpp"
         command: |
-          export PATH=$PATH:~/bin
           ./wat2wasm4cpp.py test/unittests/api_test.cpp
           ./wat2wasm4cpp.py test/unittests/end_to_end_test.cpp
           ./wat2wasm4cpp.py test/unittests/execute_call_test.cpp