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+#!/bin/bash
+
+# For bold and italic we can use the Mathematical font variant mappings,
+#  although those are only defined for Latin and Greek.
+# Latin bold capital: u1d400 - u1d419
+# Latin bold small: u1d41a - u1d433
+# Latin italic capital: u1d434 - u1d44d
+# Latin italic small: u1d44e - u1d467
+# Latin bold italic capital: u1d468 - u1d481
+# Latin bold italic small: u1d482 - u1d49b
+# (Script capital, script small, bold script capital, bold script small)
+# (Fraktur capital, fraktur small)
+# (Double-struck capital, double-struck small)
+# (some Hebrew symbol variants)
+# (Bold fraktur capital, bold fraktur small)
+# (Sans-serif capital, sans-serif small)
+# (Sans-serif bold capital, sans-serif bold small)
+# (Sans-serif italic capital, sans-serif italic small)
+# (Sans-serif bold italic capital, sans-serif bold italic small)
+# (Monospace capital, monospace small)
+# Greek bold capital: u1d6a8 - u1d6c0
+# Greek bold small: u1d6c2 - u1d6da
+# Greek italic capital: u1d6e2 - u1d6fa
+# Greek italic small: u1dcfc - u1d714
+# Greek bold italic capital: u1d71c - u1d734
+# Greek bold italic small: u1d736 - u1d74e
+# (Greek sans-serif bold capital: u1d756 - u1d76e)
+# (Greek sans-serif bold small: u1d770 - u1d788)
+# (Greek sans-serif bold italic capital: u1d790 - u1d7a8)
+# (Greek sans-serif bold italic small: u1d7aa - u1d7c2)
+# bold digits: u1d7ce - u1d7d7
+# (double-struck digits)
+# (sans-serif digits)
+# (sans-serif bold digits)
+# (monospace digits)
+# (Arabic mathematical)
+# (Arabic stretched)
+# (Arabic looped)
+# (Arabic double-struck)
+#
+# It turns out there are no Unicode control codes for marking text
+#  bold or italic.  There are for subscript and superscript,
+#  and ASCII has similar codes which nobody ever uses.
+
+declare -A bold=(
+	[A]=$'\xf0\x9d\x90\x80'
+	[B]=$'\xf0\x9d\x90\x81'
+	[C]=$'\xf0\x9d\x90\x82'
+	[D]=$'\xf0\x9d\x90\x83'
+	[E]=$'\xf0\x9d\x90\x84'
+	[F]=$'\xf0\x9d\x90\x85'
+	[G]=$'\xf0\x9d\x90\x86'
+	[H]=$'\xf0\x9d\x90\x87'
+	[I]=$'\xf0\x9d\x90\x88'
+	[J]=$'\xf0\x9d\x90\x89'
+	[K]=$'\xf0\x9d\x90\x8a'
+	[L]=$'\xf0\x9d\x90\x8b'
+	[M]=$'\xf0\x9d\x90\x8c'
+	[N]=$'\xf0\x9d\x90\x8d'
+	[O]=$'\xf0\x9d\x90\x8e'
+	[P]=$'\xf0\x9d\x90\x8f'
+	[Q]=$'\xf0\x9d\x90\x90'
+	[R]=$'\xf0\x9d\x90\x91'
+	[S]=$'\xf0\x9d\x90\x92'
+	[T]=$'\xf0\x9d\x90\x93'
+	[U]=$'\xf0\x9d\x90\x94'
+	[V]=$'\xf0\x9d\x90\x95'
+	[W]=$'\xf0\x9d\x90\x96'
+	[X]=$'\xf0\x9d\x90\x97'
+	[Y]=$'\xf0\x9d\x90\x98'
+	[Z]=$'\xf0\x9d\x90\x99'
+	[a]=$'\xf0\x9d\x90\x9a'
+	[b]=$'\xf0\x9d\x90\x9b'
+	[c]=$'\xf0\x9d\x90\x9c'
+	[d]=$'\xf0\x9d\x90\x9d'
+	[e]=$'\xf0\x9d\x90\x9e'
+	[f]=$'\xf0\x9d\x90\x9f'
+	[g]=$'\xf0\x9d\x90\xa0'
+	[h]=$'\xf0\x9d\x90\xa1'
+	[i]=$'\xf0\x9d\x90\xa2'
+	[j]=$'\xf0\x9d\x90\xa3'
+	[k]=$'\xf0\x9d\x90\xa4'
+	[l]=$'\xf0\x9d\x90\xa5'
+	[m]=$'\xf0\x9d\x90\xa6'
+	[n]=$'\xf0\x9d\x90\xa7'
+	[o]=$'\xf0\x9d\x90\xa8'
+	[p]=$'\xf0\x9d\x90\xa9'
+	[q]=$'\xf0\x9d\x90\xaa'
+	[r]=$'\xf0\x9d\x90\xab'
+	[s]=$'\xf0\x9d\x90\xac'
+	[t]=$'\xf0\x9d\x90\xad'
+	[u]=$'\xf0\x9d\x90\xae'
+	[v]=$'\xf0\x9d\x90\xaf'
+	[w]=$'\xf0\x9d\x90\xb0'
+	[x]=$'\xf0\x9d\x90\xb1'
+	[y]=$'\xf0\x9d\x90\xb2'
+	[z]=$'\xf0\x9d\x90\xb3'
+	[Α]=$'\xf0\x9d\x9a\xa8'
+	[Β]=$'\xf0\x9d\x9a\xa9'
+	[Γ]=$'\xf0\x9d\x9a\xaa'
+	[Δ]=$'\xf0\x9d\x9a\xab'
+	[Ε]=$'\xf0\x9d\x9a\xac'
+	[Ζ]=$'\xf0\x9d\x9a\xad'
+	[Η]=$'\xf0\x9d\x9a\xae'
+	[Θ]=$'\xf0\x9d\x9a\xaf'
+	[Ι]=$'\xf0\x9d\x9a\xb0'
+	[Κ]=$'\xf0\x9d\x9a\xb1'
+	[Λ]=$'\xf0\x9d\x9a\xb2'
+	[Μ]=$'\xf0\x9d\x9a\xb3'
+	[Ν]=$'\xf0\x9d\x9a\xb4'
+	[Ξ]=$'\xf0\x9d\x9a\xb5'
+	[Ο]=$'\xf0\x9d\x9a\xb6'
+	[Π]=$'\xf0\x9d\x9a\xb7'
+	[Ρ]=$'\xf0\x9d\x9a\xb8'
+	[Σ]=$'\xf0\x9d\x9a\xba'
+	[Τ]=$'\xf0\x9d\x9a\xbb'
+	[Υ]=$'\xf0\x9d\x9a\xbc'
+	[Φ]=$'\xf0\x9d\x9a\xbd'
+	[Χ]=$'\xf0\x9d\x9a\xbe'
+	[Ψ]=$'\xf0\x9d\x9a\xbf'
+	[Ω]=$'\xf0\x9d\x9b\x80'
+	[α]=$'\xf0\x9d\x9b\x82'
+	[β]=$'\xf0\x9d\x9b\x83'
+	[γ]=$'\xf0\x9d\x9b\x84'
+	[δ]=$'\xf0\x9d\x9b\x85'
+	[ε]=$'\xf0\x9d\x9b\x86'
+	[ζ]=$'\xf0\x9d\x9b\x87'
+	[η]=$'\xf0\x9d\x9b\x88'
+	[θ]=$'\xf0\x9d\x9b\x89'
+	[ι]=$'\xf0\x9d\x9b\x8a'
+	[κ]=$'\xf0\x9d\x9b\x8b'
+	[λ]=$'\xf0\x9d\x9b\x8c'
+	[μ]=$'\xf0\x9d\x9b\x8d'
+	[ν]=$'\xf0\x9d\x9b\x8e'
+	[ξ]=$'\xf0\x9d\x9b\x8f'
+	[ο]=$'\xf0\x9d\x9b\x90'
+	[π]=$'\xf0\x9d\x9b\x91'
+	[ρ]=$'\xf0\x9d\x9b\x92'
+	[ς]=$'\xf0\x9d\x9b\x93'
+	[σ]=$'\xf0\x9d\x9b\x94'
+	[τ]=$'\xf0\x9d\x9b\x95'
+	[υ]=$'\xf0\x9d\x9b\x96'
+	[φ]=$'\xf0\x9d\x9b\x97'
+	[χ]=$'\xf0\x9d\x9b\x98'
+	[ψ]=$'\xf0\x9d\x9b\x99'
+	[ω]=$'\xf0\x9d\x9b\x9a'
+)
+
+declare -A italic=(
+	[A]=$'\xf0\x9d\x90\xb4'
+	[B]=$'\xf0\x9d\x90\xb5'
+	[C]=$'\xf0\x9d\x90\xb6'
+	[D]=$'\xf0\x9d\x90\xb7'
+	[E]=$'\xf0\x9d\x90\xb8'
+	[F]=$'\xf0\x9d\x90\xb9'
+	[G]=$'\xf0\x9d\x90\xba'
+	[H]=$'\xf0\x9d\x90\xbb'
+	[I]=$'\xf0\x9d\x90\xbc'
+	[J]=$'\xf0\x9d\x90\xbd'
+	[K]=$'\xf0\x9d\x90\xbe'
+	[L]=$'\xf0\x9d\x90\xbf'
+	[M]=$'\xf0\x9d\x91\x80'
+	[N]=$'\xf0\x9d\x91\x81'
+	[O]=$'\xf0\x9d\x91\x82'
+	[P]=$'\xf0\x9d\x91\x83'
+	[Q]=$'\xf0\x9d\x91\x84'
+	[R]=$'\xf0\x9d\x91\x85'
+	[S]=$'\xf0\x9d\x91\x86'
+	[T]=$'\xf0\x9d\x91\x87'
+	[U]=$'\xf0\x9d\x91\x88'
+	[V]=$'\xf0\x9d\x91\x89'
+	[W]=$'\xf0\x9d\x91\x8a'
+	[X]=$'\xf0\x9d\x91\x8b'
+	[Y]=$'\xf0\x9d\x91\x8c'
+	[Z]=$'\xf0\x9d\x91\x8d'
+	[a]=$'\xf0\x9d\x91\x8e'
+	[b]=$'\xf0\x9d\x91\x8f'
+	[c]=$'\xf0\x9d\x91\x90'
+	[d]=$'\xf0\x9d\x91\x91'
+	[e]=$'\xf0\x9d\x91\x92'
+	[f]=$'\xf0\x9d\x91\x93'
+	[g]=$'\xf0\x9d\x91\x94'
+	[h]=$'\xf0\x9d\x98\xa9' # Sans-serif, because f0 9d 91 95 is not assigned.
+	[i]=$'\xf0\x9d\x91\x96'
+	[j]=$'\xf0\x9d\x91\x97'
+	[k]=$'\xf0\x9d\x91\x98'
+	[l]=$'\xf0\x9d\x91\x99'
+	[m]=$'\xf0\x9d\x91\x9a'
+	[n]=$'\xf0\x9d\x91\x9b'
+	[o]=$'\xf0\x9d\x91\x9c'
+	[p]=$'\xf0\x9d\x91\x9d'
+	[q]=$'\xf0\x9d\x91\x9e'
+	[r]=$'\xf0\x9d\x91\x9f'
+	[s]=$'\xf0\x9d\x91\xa0'
+	[t]=$'\xf0\x9d\x91\xa1'
+	[u]=$'\xf0\x9d\x91\xa2'
+	[v]=$'\xf0\x9d\x91\xa3'
+	[w]=$'\xf0\x9d\x91\xa4'
+	[x]=$'\xf0\x9d\x91\xa5'
+	[y]=$'\xf0\x9d\x91\xa6'
+	[z]=$'\xf0\x9d\x91\xa7'
+	[Α]=$'\xf0\x9d\x9b\xa2'
+	[Β]=$'\xf0\x9d\x9b\xa3'
+	[Γ]=$'\xf0\x9d\x9b\xa4'
+	[Δ]=$'\xf0\x9d\x9b\xa5'
+	[Ε]=$'\xf0\x9d\x9b\xa6'
+	[Ζ]=$'\xf0\x9d\x9b\xa7'
+	[Η]=$'\xf0\x9d\x9b\xa8'
+	[Θ]=$'\xf0\x9d\x9b\xa9'
+	[Ι]=$'\xf0\x9d\x9b\xaa'
+	[Κ]=$'\xf0\x9d\x9b\xab'
+	[Λ]=$'\xf0\x9d\x9b\xac'
+	[Μ]=$'\xf0\x9d\x9b\xad'
+	[Ν]=$'\xf0\x9d\x9b\xae'
+	[Ξ]=$'\xf0\x9d\x9b\xaf'
+	[Ο]=$'\xf0\x9d\x9b\xb0'
+	[Π]=$'\xf0\x9d\x9b\xb1'
+	[Ρ]=$'\xf0\x9d\x9b\xb2'
+	[Σ]=$'\xf0\x9d\x9b\xb4'
+	[Τ]=$'\xf0\x9d\x9b\xb5'
+	[Υ]=$'\xf0\x9d\x9b\xb6'
+	[Φ]=$'\xf0\x9d\x9b\xb7'
+	[Χ]=$'\xf0\x9d\x9b\xb8'
+	[Ψ]=$'\xf0\x9d\x9b\xb9'
+	[Ω]=$'\xf0\x9d\x9b\xba'
+	[α]=$'\xf0\x9d\x9b\xbc'
+	[β]=$'\xf0\x9d\x9b\xbd'
+	[γ]=$'\xf0\x9d\x9b\xbe'
+	[δ]=$'\xf0\x9d\x9b\xbf'
+	[ε]=$'\xf0\x9d\x9c\x80'
+	[ζ]=$'\xf0\x9d\x9c\x81'
+	[η]=$'\xf0\x9d\x9c\x82'
+	[θ]=$'\xf0\x9d\x9c\x83'
+	[ι]=$'\xf0\x9d\x9c\x84'
+	[κ]=$'\xf0\x9d\x9c\x85'
+	[λ]=$'\xf0\x9d\x9c\x86'
+	[μ]=$'\xf0\x9d\x9c\x87'
+	[ν]=$'\xf0\x9d\x9c\x88'
+	[ξ]=$'\xf0\x9d\x9c\x89'
+	[ο]=$'\xf0\x9d\x9c\x8a'
+	[π]=$'\xf0\x9d\x9c\x8b'
+	[ρ]=$'\xf0\x9d\x9c\x8c'
+	[ς]=$'\xf0\x9d\x9c\x8d'
+	[σ]=$'\xf0\x9d\x9c\x8e'
+	[τ]=$'\xf0\x9d\x9c\x8f'
+	[υ]=$'\xf0\x9d\x9c\x90'
+	[φ]=$'\xf0\x9d\x9c\x91'
+	[χ]=$'\xf0\x9d\x9c\x92'
+	[ψ]=$'\xf0\x9d\x9c\x93'
+	[ω]=$'\xf0\x9d\x9c\x94'
+)
+
+# TODO: bold italics.
+
+while IFS= read -r line
+do for i in $(seq 0 $((${#line}-1)))
+	do
+		c1=${line:$i:1}
+		if [[ $c1 =~ [a-zA-Zα-ωΑ-Ω] ]]
+		then replacement+=${bold[$c1]}
+		else replacement+=$'\u0331'$c1
+		fi
+	done
+	echo "$replacement"
+done