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Make use of the crate's prelude to replace individual imports
Automatically apply changes with the following:
#!/bin/bash
set -eux
files=()
# Types either defined in this crate or in `core`
prelude_types=(
c_char
c_double
c_float
c_int
c_longlong
c_long
c_short
c_uchar
c_uint
c_ulonglong
c_ulong
c_ushort
c_void
intptr_t
size_t
ssize_t
Clone
Copy
Option
Send
Sync
)
# Reexports from core
prelude_modules=(
fmt
hash
iter
mem
)
# Everything in the prelude
prelude=( "${prelude_types[@]}" "${prelude_modules[@]}" )
# Generate a list of all files excluding `lib.rs` (since the prelude being
# defined there makes string matching weird).
while IFS= read -r -d '' file; do
files+=("$file")
done < <(find src -name '*.rs' -not -name '*lib.rs' -not -name '*macros.rs' -not -name 'fixed_width_ints.rs' -print0)
for file in "${files[@]}"; do
needs_prelude=0
# If the file already has some sort of glob import, skip it
if rg --pcre2 -q 'use (crate|super)::(?!prelude).*\*' "$file"; then
continue
fi
# Core types always require the prelude to handle rustc-dep-of-std
if rg --pcre2 -q '\b(?<!\.)(Option|Clone|Copy|Send|Sync|fmt|hash|iter|mem)\b' "$file"; then
needs_prelude=1
fi
# If we use any types that are specified in the prelude then we will import it
for ty in "${prelude[@]}"; do
# If the type is defined in the current module, we don't need it from the prelude
if rg -q "type $ty =" "$file"; then
continue
fi
if rg -qU '((crate|super)::'"$ty"'|use (crate|super)::(\{\n){0,2}.*'"$ty)" "$file"; then
needs_prelude=1
fi
done
# Check if the prelude is needed and does not already exist; if so, add it
if [ "$needs_prelude" = "1" ] && ! rg -q 'use crate::prelude::\*' "$file"; then
# Split the file into two parts: module-level attributes and rest
# Imports will be added after module-level attributes
attrs=$(awk '/^#!|^\/\/!/ {found=NR} {lines[NR]=$0} END {for (i=1; i<=found; i++) print lines[i]}' "$file")
rest=$(awk '/^#!|^\/\/!/ {found=NR} END {if (found) {for (i=found+1; i<=NR; i++) print lines[i]} else {for (i=1; i<=NR; i++) print lines[i]}} {lines[NR]=$0}' "$file")
printf "%s\n" "$attrs" > "$file"
printf "\n%s\n\n" "use crate::prelude::*;" >> "$file"
printf "%s" "$rest" >> "$file"
fi
for ty in "${prelude[@]}"; do
export TY="$ty" # env for perl to use
# Remove simple imports `use crate::ty;`
perl -pi -0777 -e 's/use ((crate|super)::)?($ENV{TY});//g' "$file"
# Remove the type if it is part of a group import
perl -pi -0777 -e 's/(use (crate|super)::\{?(.*|(\n.*){0,2}))\b$ENV{TY}\b,? ?/$1/g' "$file"
# Replace pathed `crate::ty`
perl -pi -0777 -e 's/(crate|super)::($ENV{TY})\b/$2/g' "$file"
done
# For some reason, rustfmt doesn't trim leading newlines. Do so manually here.
perl -pi -0777 -e 's/\A\n+//' "$file"
rustfmt "$file"
done
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