#!/usr/bin/env bash
# definitions.sh — catch duplicate top-level definitions at El level.
#
# El has no namespacing. `import` is textual inlining, so two modules defining
# the same name emit two C functions into one translation unit. cc does catch
# it, but reports the generated helpers (__el_body_f, __env_f, __thunk_f) before
# the user's own function, so the first three errors name symbols the user never
# wrote.
#
# LIMIT, stated rather than hidden: textual inlining destroys file provenance.
# By the time codegen runs there is one source string and no record of which
# file a definition came from, so this can say WHICH name collides but not which
# files. Naming the files needs provenance threaded through resolve_imports.
set -uo pipefail
REL="${1:?usage: definitions.sh <relations-file>}"
[ -f "$REL" ] || exit 0
V=0
while read -r name count; do
    [ "$count" -gt 1 ] || continue
    printf "duplicate definition: '%s' is defined %s times — El has no namespacing, so imported modules share one global scope\n" "$name" "$count"
    V=$((V+1))
done < <(grep ' calls defines$' "$REL" | awk '{print $1}' | sort | uniq -c | awk '{print $2, $1}')
[ "$V" -eq 0 ] && echo "definitions: clean"
exit "$V"