Vim Notes

• Generate tags for the help docs:
  • Default vim utility:helpt path_to_doc_folder
  • Provided by Pathogen:Helptags
• echo the environment variables:
• echo &variablename
• set variable ?
• Check the number of selected lines in visual mode: g<c-g>
• Delete the things with in parentheses:
  • di(
• Installation of YouCompleteMe! YouCompleteMe!
• List all the settings that are different from the default value: :set
  Check where is a variable last set: :verbose set var ?
  List all the scripts that the vim has sourced: :scriptnames
• Some path related macros:
  • echo @%
  • echo @#
  • pwd
• the difference between let and set
  • "let" is to set the value of a variable while "set" is to set the value of a option
  • an option can be transfered to a variable by adding a &, so "let" can assign value to &option. But "set" has no way to set the value of a variable.
  • some boolean options can only be set by "set", because they don't take any values. eg: set number
  • set option& : to restore the default value of an option
  • set option! : to unset a boolean option
• try to write to some read only file
  • !sudo tee % \gt/dev/null will definitely do the job.
  • but after trying a while, I found !sudo cat \gt % won't do the job. This is because "cat" just write to the stdout, and you were using a bash operator \gt to put it to a file, and of course if you wrote in that way the sudo won't be able to cover the trailing bash operator.
  • the solution to this is to reform sudo. Instead of the previous version, we should use : !sudo -s "cat \gt %" and -s means sudo will use a shell to run the entire expression
• reselected the previous highlighted selects : gv