How do I insert a specific character along all lines on a specific column in Vim?

 Dates
=======

 Name                                   | Date
-------------------------------------------------
* Battle of the Plains of Abraham       | September 13, 1759
* Proclamation Act                      | October   07, 1763
* Stamp Act                             | March     22, 1765
* Guy Carleton becomes Governor         | April     07, 1766
* Boston Tea Party                      | December  16, 1773
* Quebec Act      开发者_开发问答                      |
* Declaration of Independance           | <====== # How do I insert this bar character
* Treaty of Paris                                 # along the whole column?
* Constitutional Act                
* French Revolution                 
* War of 1812

I want to be able to insert that bar character without having to manually go and insert it. While this is not syntactically correct, this is supposed to be markdown.

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I'm only a beginner, but here's what I do:

• C-v to enter Visual Block (Use C-q on windows)
• Select column (motion keys hjkl)
• I
• Enter text
• Esc

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%s/$/                                        /
v/|/s/^\(........................................\)/\1|/
%s/  *$//

Some notes:

• You will need a : in front of each line if you are in vi's normal visual mode
• Alternatively, you can put those commands in a command file and type $ ex file < cmds but in that case add an x as the fourth line
• This works by appending blanks to each line, then changing the right one to a | for lines that don't already have a |, and then deleting any trailing blanks