builtin/apply: introduce 'struct apply_state' to start libifying

diff --git a/t/t1020-subdirectory.sh b/t/t1020-subdirectory.sh
index 8e22b03cdd132bd54f9db44d362c15d129415651..df3183ea1ab36a46b914333e834093bd50847265 100755 (executable)
--- a/t/t1020-subdirectory.sh
+++ b/t/t1020-subdirectory.sh
@@ -141,13 +141,13 @@ test_expect_success 'GIT_PREFIX for !alias' '
 test_expect_success 'GIT_PREFIX for built-ins' '
        # Use GIT_EXTERNAL_DIFF to test that the "diff" built-in
        # receives the GIT_PREFIX variable.
-       printf "dir/" >expect &&
-       printf "#!/bin/sh\n" >diff &&
-       printf "printf \"\$GIT_PREFIX\"" >>diff &&
-       chmod +x diff &&
+       echo "dir/" >expect &&
+       write_script diff <<-\EOF &&
+       printf "%s\n" "$GIT_PREFIX"
+       EOF
        (
                cd dir &&
-               printf "change" >two &&
+               echo "change" >two &&
                GIT_EXTERNAL_DIFF=./diff git diff >../actual
                git checkout -- two
        ) &&