Convert printf internals to iterator

include.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+SUPRESS_ALL_THE_ERRORS=yes
+
 set -e
 
 include="$(realpath "$1")"
@@ -7,6 +9,10 @@ include="$(realpath "$1")"
 cargo build --release --manifest-path cbindgen/Cargo.toml
 cbindgen="$(realpath target/release/cbindgen)"
 
+if [ "$SUPRESS_ALL_THE_ERRORS" = "yes" ]; then
+    echo -e "\e[91mNote: Warnings by cbindgen are suppressed in include.sh.\e[0m"
+fi
+
 jobs=()
 for config in src/header/*/cbindgen.toml
 do
@@ -15,10 +21,16 @@ do
     if [ "${name:0:1}" != "_" ]
     then
         header="$include/${name/_//}.h"
-        pushd "$dir"
-        "$cbindgen" -c cbindgen.toml -o "$header" mod.rs &
+        pushd "$dir" > /dev/null
+        echo "$dir"
+        cbindgen_cmd='"$cbindgen" -c cbindgen.toml -o "$header" mod.rs'
+        if [ "$SUPRESS_ALL_THE_ERRORS" = "yes" ]; then
+            eval "$cbindgen_cmd" 2>&1 | (grep "^ERROR" -A 3 || true) &
+        else
+            eval "$cbindgen_cmd" &
+        fi
         jobs+=($!)
-        popd
+        popd > /dev/null
     fi
 done