added julia icon for windows notification, fixed linux errors

LICENSE

@@ -19,3 +19,29 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+Logo designs in this repository are
+
+- **Copyright (c) 2012-2019:** Stefan Karpinski \<[email protected]\>.
+
+These designs are licensed under the Creative Commons
+["BY-NC-SA" 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/) License.
+This means that you are free to:
+
+- **Share** — copy and redistribute the material in any medium or format
+- **Adapt** — remix, transform, and build upon the material
+
+The licensor cannot revoke these freedoms as long as you follow the license terms:
+
+- **Attribution** — You must give appropriate credit, provide a link to the license,
+  and indicate if changes were made. You may do so in any reasonable manner, but not
+  in any way that suggests the licensor endorses you or your use.
+- **NonCommercial** — You may not use the material for commercial purposes.
+- **ShareAlike** — If you remix, transform, or build upon the material, you must
+  distribute your contributions under the same license as the original.
+- **No additional restrictions** — You may not apply legal terms or technological
+  measures that legally restrict others from doing anything the license permits.
+
+If you wish to use the Julia logo as is or derive another logo from it for commercial
+purposes, you must conact the licensor, [Stefan Karpinski]([email protected]), for
+permission to do so as such usage is not covered under this license.

src/Alert.jl

@@ -27,21 +27,22 @@ function alert(message="Done!")
     @static if Sys.isapple()
         run(`osascript -e 'display notification "'$message'" with title "Julia"'`)
     elseif Sys.islinux()
-        if !isempty(Sys.which("notify-send"))
+        if !isnothing(Sys.which("notify-send"))
             run(`notify-send $message`)
-        elseif !isempty(Sys.which("zenity"))
+        elseif !isnothing(Sys.which("zenity"))
             run(pipeline(`echo $message`,`zenity --notification --listen`))
-        elseif !isempty(Sys.which("kdialog"))
+        elseif !isnothing(Sys.which("kdialog"))
             run(`kdialog --title "Julia" --passivepopup $message 10`,wait=false)
-        elseif !isempty(Sys.which("xmessage"))
+        elseif !isnothing(Sys.which("xmessage"))
             run(`xmessage $message`)
         else
             @info "Trying to send message: $message."
             @error("No program for displaying notifications available, install",
                    " 'notify-send', 'zenity', 'kdialog' or 'xmessage'.")
         end
     elseif Sys.iswindows()
-        wintoast.ToastNotifier().show_toast("Julia",message)
+        wintoast.ToastNotifier().show_toast("Julia",message,
+            icon_path=joinpath(@__DIR__,"..","images","julia.ico"))
     else
         @info "Trying to send message: $message."
         @error "Unsupported operating system."