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# No substitutions
abcd abcd
# Percent -> %
ab%cd ab%cd
# Dollar -> $
ab$cd ab$cd
# Lone brace
ab{cd ab{cd
ab${cd ab${cd
ab}cd ab}cd
# Variable
ab${head}def abyesdef
ab${head}def${head}xy abyesdefyesxy
${head}def yesdef
${h}def Zdef
${true} 1
${false} 0
# Subtitute the value
X${head}Y XyesY
X${head=yes}Y XY
X${head=no}Y XY
# Subtitute the 'true' part
X${head|foo}Y XfooY
X${head|fo\|o}Y Xfo|oY
X${head|1}Y X1Y
X${head|0}Y X0Y
X${hexd|foo}Y XY
X|${hexd|fo\|o}|Y X||Y
# ${} refers to the value of the key.
X${head|This is ${}!}Y XThis is yes!Y
X${head=yes|This is ${}!}Y XThis is yes!Y
X${head=no|This is ${}!}Y XY
X${capo=1|${} capo|${} capoes}Y X1 capoY
X${capo=0|${} capoes|${} capo}Y X1 capoY
# But only within a ${ ... }.
X${}Y X${}Y
# Subtitute the 'false' part
X${head=no|foo|bar}Y XbarY
X${hexd|foo|bar}Y XbarY
X${hexd=yes|foo|bar}Y XbarY
X${hexd=no|foo|bar}Y XbarY
X${hexd=|foo|bar}Y XfooY
X${hexd|foo|0}Y X0Y
X${h|foo|bar}Y XfooY
X${h=Z|foo|bar}Y XfooY
# Nested.
X${head|x${foo}z|bar}Y XxzY
X${hexd|x${foo}z|bar}Y XbarY
# Note that ${} is the value of foo (inner), not head (outer)
X${head|x${foo|ab|f${}g}z}Y XxfgzY
# Recursive substitution.
${subtitle} CAPO 1
# Transpose.
${key} G
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