# Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
#
# SPDX-License-Identifier: GPL-2.0-or-later

.DEFAULT_GOAL = all
.SECONDARY:
.DELETE_ON_ERROR:

btrfsitem/items.txt: btrfsitem $(wildcard btrfsitem/item_*.go) $(MAKEFILE_LIST)
	{ \
	  sed -En 's,^type (\S+) .* // (.*=.*),\1 \2,p' $(filter btrfsitem/item_%.go,$^) | while read -r typ keys; do \
	    for key in $$keys; do \
	      echo "$$key" "$$typ"; \
	    done; \
	  done; \
	} | LC_COLLATE=C sort >$@
files += btrfsitem/items.txt

btrfsitem/items_gen.go: btrfsitem/items.txt $(MAKEFILE_LIST)
	{ \
	  echo '// Code generated by Make.  DO NOT EDIT.'; \
	  echo; \
	  echo '// SPDX-License-Identifier: GPL-2.0-or-later'; \
	  echo; \
	  echo 'package $(@D)'; \
	  echo 'import ('; \
	  echo   '"reflect"'; \
	  echo; \
	  echo   '"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"'; \
	  echo ')'; \
	  echo 'const ('; \
	  sed -E 's,(.*)=(.*) (.*),\1_KEY=internal.\1_KEY,' $<; \
	  echo ')'; \
	  echo 'var keytype2gotype = map[Type]reflect.Type{'; \
	  sed -En 's|(.*)=([^:]*) (.*)|\1_KEY: reflect.TypeOf(\3{}),|p' $<; \
	  echo '}'; \
	  echo 'var untypedObjID2gotype = map[internal.ObjID]reflect.Type{'; \
	  sed -En 's|UNTYPED=0:(.*) (.*)|internal.\1: reflect.TypeOf(\2{}),|p' $<; \
	  echo '}'; \
	  sed -En 's,(.*)=(.*) (.+),\3,p' $< | LC_COLLATE=C sort -u | sed 's,.*,func (&) isItem() {},'; \
	} | gofmt >$@
files += btrfsitem/items_gen.go

internal/itemtype.go: btrfsitem/items.txt $(MAKEFILE_LIST)
	{ \
	  echo '// Code generated by Make.  DO NOT EDIT.'; \
	  echo; \
	  echo '// SPDX-License-Identifier: GPL-2.0-or-later'; \
	  echo; \
	  echo 'package $(@D)'; \
	  echo 'import "fmt"'; \
	  echo 'type ItemType uint8'; \
	  echo 'const ('; \
	  sed -E 's,(.*)=([^:]*)(:.*)? (.*),\1_KEY=ItemType(\2),' $< | uniq; \
	  echo ')'; \
	  echo 'func (t ItemType) String() string {'; \
	  echo '  names := map[ItemType]string{'; \
	  sed -E 's@(.*)=(.*) (.*)@\1_KEY: "\1",@' $< | sed 's/"UUID_/&KEY_/'; \
	  echo '  }'; \
	  echo '  if name, ok := names[t]; ok {'; \
	  echo '    return name'; \
	  echo '  }'; \
	  echo '  return fmt.Sprintf("%d", t)'; \
	  echo '}'; \
	} | gofmt >$@
files += internal/itemtype.go

aliases_objid.go: internal/objid.go $(MAKEFILE_LIST)
	{ \
	  echo '// Code generated by Make.  DO NOT EDIT.'; \
	  echo; \
	  echo '// SPDX-License-Identifier: GPL-2.0-or-later'; \
	  echo; \
	  echo 'package btrfs'; \
	  echo 'import ('; \
	  echo   '"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/internal"'; \
	  echo ')'; \
	  echo 'const('; \
	  sed -En 's/^\s*(\S*_OBJECTIDS?)\s*=.*/\1 = internal.\1/p' <$<; \
	  echo ')'; \
	} | gofmt >$@
files += aliases_objid.go

all: $(files)
.PHONY: all

clean:
	rm -f -- $(files)
.PHONY: all