diff -r 82e40295dfb4 -r 0cfbaf5c57a6 bash-completion.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bash-completion.sh	Sat May 15 18:18:10 2021 +0200
@@ -0,0 +1,59 @@
+# Relational pipes
+# Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, version 3 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+_relpipe_tr_sed_completion() {
+	local w0 w1 w2 w3
+
+	COMPREPLY=()
+	w0=${COMP_WORDS[COMP_CWORD]}
+	w1=${COMP_WORDS[COMP_CWORD-1]}
+	w2=${COMP_WORDS[COMP_CWORD-2]}
+	w3=${COMP_WORDS[COMP_CWORD-3]}
+
+	BOOLEAN_VALUES=(
+		"true"
+		"false"
+	)
+
+	ENTITY_VALUES=(
+		"relation"
+		"attribute"
+		"value"
+	)
+
+	if   [[ "$w1" == "--relation"                      && "x$w0" == "x" ]];    then COMPREPLY=("'.*'")
+	elif [[ "$w1" == "--attribute"                     && "x$w0" == "x" ]];    then COMPREPLY=("'.*'")
+	elif [[ "$w1" == "--value"                         && "x$w0" == "x" ]];    then COMPREPLY=("''")
+	elif [[ "$w1" == "--replacement"                   && "x$w0" == "x" ]];    then COMPREPLY=("''")
+	elif [[ "$w1" == "--modify"                                         ]];    then COMPREPLY=($(compgen -W "${ENTITY_VALUES[*]}"  -- "$w0"))
+	elif [[ "$w1" == "--case-sensitive"                                 ]];    then COMPREPLY=($(compgen -W "${ENTITY_VALUES[*]}"  -- "$w0"))
+	elif [[ "$w2" == "--case-sensitive"                                 ]];    then COMPREPLY=($(compgen -W "${BOOLEAN_VALUES[*]}" -- "$w0"))
+	elif [[ "$w1" == "--invert-match"                                   ]];    then COMPREPLY=($(compgen -W "${ENTITY_VALUES[*]}"  -- "$w0"))
+	elif [[ "$w2" == "--invert-match"                                   ]];    then COMPREPLY=($(compgen -W "${BOOLEAN_VALUES[*]}" -- "$w0"))
+	else
+		OPTIONS=(
+			"--relation"
+			"--attribute"
+			"--value"
+			"--replacement"
+			"--modify"
+			"--case-sensitive"
+			"--invert-match"
+		)
+		COMPREPLY=($(compgen -W "${OPTIONS[*]}" -- "$w0"))
+	fi
+}
+
+complete -F _relpipe_tr_sed_completion relpipe-tr-sed