Created
September 26, 2022 17:44
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| AAA_BBB = 123 | |
| BBB-CCC = 456 | |
| AAA1 = `echo $HOME` | |
| _upper_ = A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | |
| _lower_ = a b c d e f g h i j k l m n o p q r s t u v w x y z | |
| _digits_ = 0 1 2 3 4 5 6 7 8 9 | |
| define remove-recursive | |
| $(if $(1),$(call remove-recursive,$(wordlist 2,$(words $(1)),$(1)),$(subst $(firstword $(1)),,$(2))),$(2)) | |
| endef | |
| define starts-with | |
| $(if $(1),$(if $(filter $(firstword $(1))%,$(2)),$(2),$(call starts-with,$(wordlist 2,$(words $(1)),$(1)),$(2))),) | |
| endef | |
| define invalid-shell-symbols | |
| $(call remove-recursive,$(_upper_) $(_lower_) $(_digits_) _,$(1)) | |
| endef | |
| define public-shell-name | |
| $(call starts-with,$(_upper_),$(1)) | |
| endef | |
| define shell-name-vars | |
| $(foreach v,$(.VARIABLES),$(if $(call invalid-shell-symbols,$(v)),,$(call public-shell-name,$(v)))) | |
| endef | |
| define shell-export-vars | |
| $(foreach v,$(shell-name-vars),export $(v)='$(subst ','\'',$(subst \,\\,$($(v))))'; | |
| ) | |
| endef | |
| $(shell $(shell-export-vars) true) | |
| all: | |
| @:; |
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