proc tools_exec {fullname} {
        global repo_config env current_diff_path
        global current_branch is_detached
+       global selected_paths
 
        if {[is_config_true "guitool.$fullname.needsfile"]} {
                if {$current_diff_path eq {}} {
                        return
                }
        } elseif {[is_config_true "guitool.$fullname.confirm"]} {
-               if {[ask_popup [mc "Are you sure you want to run %s?" $fullname]] ne {yes}} {
-                       return
+               if {[is_config_true "guitool.$fullname.needsfile"]} {
+                       if {[ask_popup [mc "Are you sure you want to run %1\$s on file \"%2\$s\"?" $fullname $current_diff_path]] ne {yes}} {
+                               return
+                       }
+               } else {
+                       if {[ask_popup [mc "Are you sure you want to run %s?" $fullname]] ne {yes}} {
+                               return
+                       }
                }
        }
 
        set env(GIT_GUITOOL) $fullname
        set env(FILENAME) $current_diff_path
+       set env(FILENAMES) [join [array names selected_paths] \n]
        if {$is_detached} {
                set env(CUR_BRANCH) ""
        } else {
 
        unset env(GIT_GUITOOL)
        unset env(FILENAME)
+       unset env(FILENAMES)
        unset env(CUR_BRANCH)
        catch { unset env(ARGS) }
        catch { unset env(REVISION) }