#!/bin/sh
# Banco POSIX para candidatos a /bin/sh (SDD: docs/plan-botar-busybox.md §paso 3).
# Uso: scripts/sh-banco-posix.sh <ruta-al-shell>
# 57 casos POSIX ejecutados con `$SH -c`. Baseline medido 2026-09-21: busybox sh 56/57,
# brush 0.4.0 56/57 (diverge sólo en `shift` más allá de $#: devuelve 2, POSIX/busybox 1).
# NO es una prueba de suficiencia: el banco pasa y aun así brush no construye autotools.
SH="$1"; [ -n "$SH" ] || { echo "uso: $0 <ruta-al-shell>"; exit 2; }
ok=0; ko=0; KOLIST=""
t() { # t <nombre> <esperado> <codigo>
  nombre="$1"; esperado="$2"; codigo="$3"
  got=$("$SH" -c "$codigo" 2>&1)
  if [ "$got" = "$esperado" ]; then ok=$((ok+1))
  else ko=$((ko+1)); KOLIST="$KOLIST
  ✗ $nombre
      esperado: [$esperado]
      obtenido: [$got]"
  fi
}

t "echo"                 "hola"        'echo hola'
t "pipeline"             "2"           'printf "a\nb\n" | wc -l | tr -d " "'
t "redireccion"          "x"           'echo x > /tmp/_p1 && cat /tmp/_p1'
t "aqui-doc"             "linea"       'cat <<EOF
linea
EOF'
t "aqui-doc-guion"       "sin-tab"     'cat <<-EOF
	sin-tab
	EOF'
t "aqui-doc-comillado"   '$NOEXPAND'   'cat <<"EOF"
$NOEXPAND
EOF'
t "sust-comando"         "hola"        'x=$(echo hola); echo $x'
t "sust-backtick"        "hola"        'echo `echo hola`'
t "estado-salida"        "1"           'false; echo $?'
t "and-or"               "b"           'false && echo a || echo b'
t "for"                  "1 2 3"       'r=; for i in 1 2 3; do r="$r $i"; done; echo ${r# }'
t "while-read"           "a|b"         'printf "a\nb\n" | { r=; while read l; do r="$r|$l"; done; echo ${r#|}; }'
t "case"                 "si"          'case abc in a*) echo si;; *) echo no;; esac'
t "funcion"              "5"           'f() { echo $(($1+$2)); }; f 2 3'
t "local"                "fuera"       'x=fuera; f() { local x=dentro; }; f; echo $x'
t "expansion-defecto"    "def"         'unset v; echo ${v:-def}'
t "expansion-asigna"     "def def"     'unset v; echo ${v:=def} $v'
t "expansion-error"      "0"           'unset v; ( echo ${v:?falta} ) 2>/dev/null; [ $? -ne 0 ] && echo 0'
t "expansion-largo"      "3"           'v=abc; echo ${#v}'
t "quita-sufijo"         "arch"        'v=arch.tar.gz; echo ${v%%.*}'
t "quita-prefijo"        "gz"          'v=arch.tar.gz; echo ${v##*.}'
t "aritmetica"           "7"           'echo $((3+4))'
t "aritmetica-var"       "6"           'x=2; echo $((x*3))'
t "test-corchete"        "si"          '[ 1 -lt 2 ] && echo si'
t "test-cadena"          "si"          '[ "a" = "a" ] && [ -n "a" ] && echo si'
t "posicionales"         "a:b:c"       'set -- a b c; IFS=:; echo "$*"'
t "todos-arroba"         "a b c"       'set -- a b c; echo "$@"'
t "shift"                "c"           'set -- a b c; shift 2; echo $1'
t "getopts"              "v=1 f=x"     'set -- -v -f x; v=0; while getopts vf: o; do case $o in v) v=1;; f) f=$OPTARG;; esac; done; echo "v=$v f=$f"'
t "source-punto"         "sourced"     'echo "echo sourced" > /tmp/_p2; . /tmp/_p2'
t "subshell-aisla"       "fuera"       'x=fuera; ( x=dentro ); echo $x'
t "trap-exit"            "adios"       'trap "echo adios" EXIT; true'
t "set-e-corta"          "antes"       'set -e; echo antes; false; echo despues'
t "set-u"                "0"           'set -u; ( echo $NODEF ) 2>/dev/null; [ $? -ne 0 ] && echo 0'
t "exec-redir"           "z"           'exec 3>/tmp/_p3; echo z >&3; exec 3>&-; cat /tmp/_p3'
t "glob"                 "si"          'mkdir -p /tmp/_g && : > /tmp/_g/f1 && for f in /tmp/_g/f*; do [ -e "$f" ] && echo si; done'
t "glob-sin-match"       "/tmp/_nada*" 'for f in /tmp/_nada*; do echo $f; done'
t "IFS-split"            "a b c"       'IFS=,; set -- $(echo "a,b,c"); IFS=" "; echo "$*"'
t "comillas-preservan"   "a  b"        'x="a  b"; echo "$x"'
t "sin-comillas-parte"   "a b"         'x="a  b"; echo $x'
t "escape-barra"         'a\b'         'printf "%s\n" "a\\b"'
t "printf-formato"       "007"         'printf "%03d\n" 7'
t "read-var"             "dato"        'echo dato | { read v; echo $v; }'
t "eval"                 "ev"          'c="echo ev"; eval $c'
t "dollar-dollar"        "si"          '[ -n "$$" ] && echo si'
t "PATH-busca"           "si"          'command -v echo >/dev/null && echo si'
t "anidado-sust"         "ab"          'echo "$(echo a)$(echo b)"'
t "multi-cmd-punto-coma" "a b"         'echo -n "a "; echo b'
t "negacion"             "si"          'if ! false; then echo si; fi'
t "bucle-until"          "3"           'i=0; until [ $i -ge 3 ]; do i=$((i+1)); done; echo $i'
t "break-continue"       "1 3"         'r=; for i in 1 2 3 4; do [ $i = 2 ] && continue; [ $i = 4 ] && break; r="$r $i"; done; echo ${r# }'
t "return-funcion"       "7"           'f() { return 7; }; f; echo $?'
t "here-string-noposix"  "SKIP"        'echo SKIP'
t "wait-bg"              "si"          '(sleep 0.05) & wait; echo si'
t "unset-func"           "si"          'f() { echo no; }; unset -f f; command -v f >/dev/null || echo si'
t "export-hijo"          "val"         'export V=val; "'"$SH"'" -c "echo \$V"'
t "shift-sin-args"       "1"           'set --; shift 2>/dev/null; echo $?' 

echo "$SH: OK=$ok  FALLO=$ko"
[ -n "$KOLIST" ] && echo "$KOLIST"
exit $ko