Implement feature: help

bin/droller

@@ -4,6 +4,18 @@ DIRECTORY="$HOME/.config/droller"
 INDEX="$DIRECTORY/index"
 HEAD="$DIRECTORY/head"
 
+## usage: droller [s | o | 1 | -1 | ranking | edit | | <uri> | d | h]
+## [status | s] # Show the selected record      # Example: droller s
+## [open | o]   # Open the selected record      # Example: droller o
+## [+1 | 1]     # +1 to the selected record     # Example: droller 1
+## [-1 | -]     # -1 to the selected record     # Example: droller -1
+## [ranking]    # Show the ranking table        # Example: droller ranking
+## [random | ]  # Show the ranking table        # Example: droller
+## [edit | e]   # Edit the index file           # Example: droller edit
+## [<uri>]      # Add a record to the index file       # Example: droller http://www...
+## [delete | d] # Delete a record from the index file  # Example: droller d
+## [help | h]   # Help                                 # Example: droller h
+
 main() {
     createFiles
 
@@ -20,10 +32,10 @@ main() {
             plusOnePoint -1
             checkStatus
             ;;
-        "rank"|"ranking")
+        "ranking")
             ranking
             ;;
-        "random"|"r"|"")
+        "random"|"")
             selectRandomRecord
             checkStatus
             ;;
@@ -38,7 +50,7 @@ main() {
             checkStatus
             ;;
         "help"|"h")
-            echo "help";;
+            showHelp;;
         *)
             addRecord $1;;
     esac
@@ -125,5 +137,10 @@ getTitleFromUri() {
     curl -s $uri | egrep -o '<title>[^<]*?</title>' | sed -E 's,</?title>,,g'
 }
 
+showHelp() {
+    egrep '#{2} usage:' $BASH_SOURCE | sed 's/##//'
+    egrep '## \[' $BASH_SOURCE | column -ts'#'
+}
+
 main $@