TerminalVim.scpt

-- TerminalVim.app
-- This creates a shim Application that will enable you to open files from the Finder in vim using iTerm

-- To use this script: 
-- 1. Open Automator and create a new Application
-- 2. Add the "Run Applescript" action
-- 3. Paste this script into the Run Applescript section
-- 4. Save the application as TerminalVim.app in your Applications folder
-- 5. In the Finder, right click on a file and select "Open With". In that window you can set TerminalVim as a default
on run {input, parameters}
	if input is not in {} then
		set myPath to POSIX path of input
		set cmd to "vim " & quote & myPath & quote
	end if
	
	
	tell application "iTerm"
		if it is running then
			-- This is in the case where Iterm is open and no window is open.
			if (count windows) is 0 then
				create window with profile "Base16"
				tell current window
					tell current session
						write text (cmd)
					end tell
				end tell
			else
				tell current window
					-- We create a separate tab to the current window
					create tab with profile "Base16"
					tell current session
						write text (cmd)
					end tell
				end tell
			end if
			
		else
			-- At startup of iTerm...
			tell application "iTerm"
				-- We do not create a tab since we know it's at startup	
				tell current window
					tell current session
						write text (cmd)
					end tell
				end tell
				
			end tell
			
		end if
		
	end tell
	
end run

For now I don't think it handles some cases with files with single/double quotes, or that sort of edge cases..

nice script - here's a slight improvement that will focus the iterm2 window and uses the 'Default' profile:

-- TerminalVim.app
-- This creates a shim Application that will enable you to open files from the Finder in vim using iTerm

-- To use this script: 
-- 1. Open Automator and create a new Application
-- 2. Add the "Run Applescript" action
-- 3. Paste this script into the Run Applescript section
-- 4. Save the application as TerminalVim.app in your Applications folder
-- 5. In the Finder, right click on a file and select "Open With". In that window you can set TerminalVim as a default
on run {input, parameters}
	if input is not in {} then
		set myPath to POSIX path of input
		set cmd to "vim " & quote & myPath & quote
	end if
	
	
	tell application "iTerm"
		if it is running then
			-- This is in the case where Iterm is open and no window is open.
			if (count windows) is 0 then
				create window with profile "Default"
				tell current window
					tell current session
						write text (cmd)
					end tell
				end tell
				activate
			else
				tell current window
					-- We create a separate tab to the current window
					create tab with profile "Default"
					tell current session
						write text (cmd)
					end tell
				end tell
				activate
			end if
			
		else
			-- At startup of iTerm...
			tell application "iTerm"
				-- We do not create a tab since we know it's at startup	
				tell current window
					tell current session
						write text (cmd)
					end tell
				end tell
				activate
				
			end tell
			
		end if
		
	end tell
end run