feat(macro): add uppercase/lowercase/sanitize

Makefile

@@ -417,6 +417,9 @@ assert_true = \
 assert_false = \
 	$(if $(strip $1),false,:)
 
+assert_eq = \
+	$(if $(and $(findstring $1,$2),$(findstring $2,$1)),echo '$1==$2';:,echo '$1!=$2';false)
+
 assert_success = \
 	$(strip $1)
 
@@ -448,6 +451,18 @@ has_gnu_grep_impl = $(strip \
 rule_exists = \
 	$(shell $(MAKE) -n $1 >/dev/null 2>&1 && echo 1)
 
+# $(call uppercase,STR) converts STR to uppercase.
+uppercase = \
+	$(shell echo '$1' | tr a-z A-Z)
+
+# $(call lowercase,STR) converts STR to lowercase.
+lowercase = \
+	$(shell echo '$1' | tr A-Z a-z)
+
+# $(call sanitize,STR) replaces special characters in STR with underscores.
+sanitize = \
+	$(shell echo '$1' | sed 's/[^a-zA-Z0-9]/_/g')
+
 # $(init_toolchain) initializes the toolchain.
 init_toolchain = $(call cache,init_toolchain_impl)
 

tests/macro/latex.mk

@@ -36,3 +36,12 @@ test_mv_target:
 	$(call assert_success,$(call mv_target,1.tmp))
 	$(call assert_fail,   $(call mv_target,2.tmp))
 	$(call assert_success,$(call mv_target,3.tmp,false))
+
+test_uppercase:
+	$(call assert_eq,$(call uppercase,abcxyzABCXYZ0189  !"#%&*+-./x:;<=>?@x[]^_`x{|}~x  y),ABCXYZABCXYZ0189  !"#%&*+-./X:;<=>?@X[]^_`X{|}~X  Y)
+
+test_lowercase:
+	$(call assert_eq,$(call lowercase,abcxyzABCXYZ0189  !"#%&*+-./X:;<=>?@X[]^_`X{|}~X  Y),abcxyzabcxyz0189  !"#%&*+-./x:;<=>?@x[]^_`x{|}~x  y)
+
+test_sanitize:
+	$(call assert_eq,$(call sanitize,abcxyzABCXYZ0189  !"#%&*+-./x:;<=>?@x[]^_`x{|}~x  y),abcxyzABCXYZ0189____________x_______x_____x____x__y)