[enh] There should be a command plugin

plugins-available/content-command.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# Add a content line by decorating the input with triple backticks ```
+PLUGIN_CONTENT+=( hookContentCmd )
+hookContentCmd(){
+  [[ -z "$1" ]] && echo "Add a shell command line" && return
+  TMP="$1"
+  read -e -p "Command line? " CMD
+  [[ -z "$CMD" ]] && panic "Not a valid content" && return
+  echo "\`\`\`$CMD\`\`\`" >> $TMP
+}
+