Xcode 3 and Interface Builder 3 don’t like it when you switch files out from underneath them, like what happens when you switch branches in git and mercurial.

Here’s a handy AppleScript that will remember and close all your open Xcode projects and IB documents. Run it again, and all your projects+docs will be reopened, ready again for action.

tell application "System Events"
    if exists file ".xcpushpop.plist" of home folder then
        -- pop/restore
        set plist to property list file "~/.xcpushpop.plist"
        set xcList to value of property list item "xc" of plist
        set ibList to value of property list item "ib" of plist

        repeat with xcItem in xcList
            tell application "Xcode" to open xcItem
        end repeat
        repeat with ibItem in ibList
            tell application "Interface Builder" to open ibItem
        end repeat

        delete file ".xcpushpop.plist" of home folder
    else
        -- push/save
        set openedXcodeProjects to {}
        set openedIBDocs to {}

        if my isRunning("com.apple.Xcode") then
            tell application "Xcode"
                repeat with p in project documents
                    set openedXcodeProjects to openedXcodeProjects & path of p
                end repeat
                close every project document
            end tell
        end if
        if my isRunning("com.apple.InterfaceBuilder3") then
            tell application "Interface Builder"
                repeat with d in documents
                    set openedIBDocs to openedIBDocs & path of d
                end repeat
                close every document
            end tell
        end if

        set plist to make new property list file with properties {name:"~/.xcpushpop.plist"}
        make new property list item at end of property list items of contents of plist ¬
            with properties {kind:list, name:"xc", value:openedXcodeProjects}
        make new property list item at end of property list items of contents of plist ¬
            with properties {kind:list, name:"ib", value:openedIBDocs}
    end if
end tell

on isRunning(bundleID)
    tell application "System Events"
        set procList to every process whose bundle identifier is bundleID
    end tell
    return procList is not {}
end isRunning

xcode applescript Nov 14 2010