Add timeline filters

Custom filter menu is still WIP

src/search.nim

@@ -0,0 +1,80 @@
+import asyncdispatch, strutils, strformat, uri, tables
+
+import types
+
+const
+  separators = @["AND", "OR"]
+  validFilters = @[
+    "media", "images", "videos", "native_video", "twimg",
+    "links", "quote", "replies", "mentions",
+    "news", "verified", "safe"
+  ]
+
+# Experimental, this might break in the future
+# Till then, it results in shorter urls
+const
+  posPrefix = "thGAVUV0VFVBa"
+  posSuffix = "EjUAFQAlAFUAFQAA"
+
+proc initQuery*(filter, separator: string; name=""): Query =
+  var sep = separator.strip().toUpper()
+  Query(
+    filter: filter.split(",").filterIt(it in validFilters),
+    sep: if sep in separators: sep else: "AND",
+    fromUser: name,
+    queryType: custom
+  )
+
+proc getMediaQuery*(name: string): Query =
+  Query(
+    filter: @["twimg", "native_video"],
+    sep: "OR",
+    fromUser: name,
+    queryType: media
+  )
+
+proc getReplyQuery*(name: string): Query =
+  Query(fromUser: name, queryType: replies)
+
+proc genQueryParam*(query: Query): string =
+  var filters: seq[string]
+  var param: string
+
+  if query.fromUser.len > 0:
+    param = &"from:{query.fromUser} "
+
+  for f in query.filter:
+    filters.add "filter:" & f
+  for e in query.exclude:
+    filters.add "-filter:" & e
+
+  return strip(param & filters.join(&" {query.sep} "))
+
+proc genQueryUrl*(query: Query): string =
+  result = &"/{query.queryType}?"
+  if query.queryType != custom: return
+
+  var params: seq[string]
+  if query.filter.len > 0:
+    params &= "filter=" & query.filter.join(",")
+  if query.exclude.len > 0:
+    params &= "not=" & query.exclude.join(",")
+  if query.sep.len > 0:
+    params &= "sep=" & query.sep
+  if params.len > 0:
+    result &= params.join("&") & "&"
+
+proc cleanPos*(pos: string): string =
+  pos.multiReplace((posPrefix, ""), (posSuffix, ""))
+
+proc genPos*(pos: string): string =
+  posPrefix & pos & posSuffix
+
+proc tabClass*(timeline: Timeline; tab: string): string =
+  result = '"' & "tab-item"
+  if timeline.query.isNone:
+    if tab == "tweets":
+      result &= " active"
+  elif $timeline.query.get().queryType == tab:
+    result &= " active"
+  result &= '"'