Add .shellcheckrc

.shellcheckrc

@@ -0,0 +1,14 @@
+# ShellCheck configuration
+# https://github.com/koalaman/shellcheck/blob/HEAD/shellcheck.1.md#rc-files
+
+# See also:
+# https://www.shellcheck.net/wiki/Optional
+# https://google.github.io/styleguide/shellguide.html
+
+# https://www.shellcheck.net/wiki/SC2292
+# https://google.github.io/styleguide/shellguide.html#s6.3-tests
+enable=require-double-brackets
+
+# https://www.shellcheck.net/wiki/SC2250
+# https://google.github.io/styleguide/shellguide.html#s5.6-variable-expansion
+enable=require-variable-braces

main.sh

@@ -123,8 +123,8 @@ cargo_binstall() {
     # As a result, http will be disabled, and it will also set
     # min tls version to be 1.2
     case "${version}" in
-        latest) cargo binstall --force --secure --no-confirm "$tool" ;;
-        *) cargo binstall --force --secure --no-confirm --version "$version" "$tool" ;;
+        latest) cargo binstall --force --secure --no-confirm "${tool}" ;;
+        *) cargo binstall --force --secure --no-confirm --version "${version}" "${tool}" ;;
     esac
 }
 
@@ -146,7 +146,7 @@ case "${OSTYPE}" in
     cygwin* | msys*) exe=".exe" ;;
 esac
 
-cargo_bin="${CARGO_HOME:-"$HOME/.cargo"}/bin"
+cargo_bin="${CARGO_HOME:-"${HOME}/.cargo"}/bin"
 if [[ ! -d "${cargo_bin}" ]]; then
     cargo_bin=/usr/local/bin
 fi