[bash,zsh] Separate common functions into "shell/common.sh"

shell/update-common.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+# This script applies the contents of "common.sh" to the other files.
+
+set -e
+
+# Go to the directory that contains this script
+dir=${0%"${0##*/}"}
+if [ -n "$dir" ]; then
+  cd "$dir"
+fi
+
+update() {
+  {
+    sed -n '1,/^#----BEGIN INCLUDE common\.sh/p' "$1"
+    cat <<EOF
+# NOTE: Do not directly edit this section, which is copied from "common.sh".
+# To modify it, one can edit "common.sh" and run "./update-common.sh" to apply
+# the changes. See code comments in "common.sh" for the implementation details.
+EOF
+    grep -v '^[[:blank:]]*#' common.sh # remove code comments in common.sh
+    sed -n '/^#----END INCLUDE/,$p' "$1"
+  } > "$1.part"
+
+  mv -f "$1.part" "$1"
+}
+
+update completion.bash
+update completion.zsh
+update key-bindings.bash
+update key-bindings.zsh