[graph] add gexf file download button

src/Gargantext/Components/GraphExplorer.purs

@@ -140,6 +140,7 @@ explorerCpt = R.hooksComponent "G.C.GraphExplorer.explorer" cpt
                                   }
                       , mSidebar mMetaData { frontends
                                            , graph
+                                           , graphId
                                            , graphVersion
                                            , removedNodeIds: controls.removedNodeIds
                                            , session
@@ -171,6 +172,7 @@ explorerCpt = R.hooksComponent "G.C.GraphExplorer.explorer" cpt
     mSidebar :: Maybe GET.MetaData
              -> { frontends :: Frontends
                 , graph :: SigmaxT.SGraph
+                , graphId :: GraphId
                 , graphVersion :: R.State Int
                 , removedNodeIds :: R.State SigmaxT.NodeIds
                 , showSidePanel :: GET.SidePanelState
@@ -178,9 +180,10 @@ explorerCpt = R.hooksComponent "G.C.GraphExplorer.explorer" cpt
                 , session :: Session }
              -> R.Element
     mSidebar Nothing _ = RH.div {} []
-    mSidebar (Just metaData) {frontends, graph, graphVersion, removedNodeIds, session, selectedNodeIds, showSidePanel} =
+    mSidebar (Just metaData) {frontends, graph, graphId, graphVersion, removedNodeIds, session, selectedNodeIds, showSidePanel} =
       Sidebar.sidebar { frontends
                       , graph
+                      , graphId
                       , graphVersion
                       , metaData
                       , removedNodeIds

src/Gargantext/Components/GraphExplorer/Sidebar.purs

@@ -24,15 +24,18 @@ import Gargantext.Components.NgramsTable.Core as NTC
 import Gargantext.Components.Nodes.Corpus.Graph.Tabs as GT
 import Gargantext.Components.RandomText (words)
 import Gargantext.Data.Array (mapMaybe)
-import Gargantext.Ends (Frontends)
+import Gargantext.Ends (Frontends, url)
 import Gargantext.Hooks.Sigmax.Types as SigmaxT
+import Gargantext.Routes as Routes
 import Gargantext.Sessions (Session)
 import Gargantext.Types (CTabNgramType, TabSubType(..), TabType(..), TermList(..), modeTabType)
+import Gargantext.Types as GT
 import Gargantext.Utils.Reactix as R2
 
 type Props =
   ( frontends :: Frontends
   , graph :: SigmaxT.SGraph
+  , graphId :: Int
   , graphVersion :: R.State Int
   , metaData :: GET.MetaData
   , removedNodeIds :: R.State SigmaxT.NodeIds
@@ -64,6 +67,11 @@ sidebarCpt = R.hooksComponent "Sidebar" cpt
                   [ RH.div { className: "", role: "tabpanel" }
                     (Seq.toUnfoldable $ (Seq.map (badge props.selectedNodeIds) (badges props.graph props.selectedNodeIds)))
                   ]
+                , RH.div { className: "gexf" } [
+                   RH.a { className: "btn btn-default"
+                        , href: gexfHref props.session props.graphId
+                        , target: "_blank" } [ RH.text "Download GEXF" ]
+                  ]
                 , RH.div { className: "tab-content" }
                   [
                     removeButton "Remove candidate" CandidateTerm props nodesMap
@@ -123,6 +131,9 @@ sidebarCpt = R.hooksComponent "Sidebar" cpt
       snd props.removedNodeIds $ const $ fst props.selectedNodeIds
       snd props.selectedNodeIds $ const SigmaxT.emptyNodeIds
 
+    gexfHref :: Session -> Int -> String
+    gexfHref session graphId = url session $ Routes.NodeAPI GT.Graph (Just graphId) "gexf"
+
 
 badge :: R.State SigmaxT.NodeIds -> Record SigmaxT.Node -> R.Element
 badge (_ /\ setNodeIds) {id, label} =