Add jsheaders (#56)

changelog.md

@@ -7,3 +7,6 @@
   convenience functions to change file permissions using Unix like octal file permissions.
 - Added module `scripting` providing `withDir` to switch the directory temporarily. This
   was previously only available in the `nimscript` module.
+
+
+- Added `jsheaders` module for [`Headers`](https://developer.mozilla.org/en-US/docs/Web/API/Headers) for the JavaScript target.

src/fusion/docutils.nim

@@ -1,19 +1,27 @@
-import std/[os,strformat,sugar,osproc]
+import std/[os, strformat, sugar, osproc]
 import std/private/globs
 
+
+const blockList =
+  when not defined(js): ["nimcache", "htmldocs", "js"]
+  else: ["nimcache", "htmldocs"]
+
 iterator findNimSrcFiles*(dir: string): string =
   proc follow(a: PathEntry): bool =
-    a.path.lastPathPart notin ["nimcache", "htmldocs"]
+    a.path.lastPathPart notin blockList
+
   for entry in walkDirRecFilter(dir, follow = follow):
     if entry.path.splitFile.ext == ".nim" and entry.kind == pcFile:
       yield entry.path
 
+
 proc genCodeImportAll*(dir: string): string =
   result = "{.warning[UnusedImport]: off.}\n"
   for a in findNimSrcFiles(dir):
     let s = "".dup(addQuoted(a))
     result.add &"import {s}\n"
 
+
 proc genDocs(dir: string, nim = "", args: seq[string]) =
   let code = genCodeImportAll(dir)
   let extra = quoteShellCommand(args)
@@ -22,6 +30,7 @@ proc genDocs(dir: string, nim = "", args: seq[string]) =
   if ret.exitCode != 0:
     doAssert false, ret.output & "\n" & code
 
+
 when isMainModule:
   let args = commandLineParams()
   doAssert args.len >= 1

src/fusion/js/jsheaders.nim

@@ -0,0 +1,51 @@
+## - HTTP Headers for the JavaScript target: https://developer.mozilla.org/en-US/docs/Web/API/Headers
+when not defined(js) and not defined(nimdoc):
+  {.fatal: "Module jsheaders is designed to be used with the JavaScript backend.".}
+
+type Headers* = ref object of JsRoot ## HTTP Headers for the JavaScript target.
+
+func newHeaders*(): Headers {.importjs: "new Headers()".}
+  ## https://developer.mozilla.org/en-US/docs/Web/API/Headers
+
+func add*(this: Headers; key: cstring; value: cstring) {.importjs: "#.append(#, #)".}
+  ## https://developer.mozilla.org/en-US/docs/Web/API/Headers/append
+
+func delete*(this: Headers; key: cstring) {.importjs: "#.$1(#)".}
+  ## https://developer.mozilla.org/en-US/docs/Web/API/Headers/delete
+
+func hasKey*(this: Headers; key: cstring): bool {.importjs: "#.has(#)".}
+  ## https://developer.mozilla.org/en-US/docs/Web/API/Headers/has
+
+func keys*(this: Headers): seq[cstring] {.importjs: "Array.from(#.$1())".}
+  ## https://developer.mozilla.org/en-US/docs/Web/API/Headers/keys
+
+func values*(this: Headers): seq[cstring] {.importjs: "Array.from(#.$1())".}
+  ## https://developer.mozilla.org/en-US/docs/Web/API/Headers/values
+
+func entries*(this: Headers): seq[array[2, cstring]] {.importjs: "Array.from(#.$1())".}
+  ## https://developer.mozilla.org/en-US/docs/Web/API/Headers/entries
+
+func `[]`*(this: Headers; key: cstring): cstring {.importjs: "#.get(#)".}
+  ## https://developer.mozilla.org/en-US/docs/Web/API/Headers/get
+
+func `[]=`*(this: Headers; key: cstring; value: cstring) {.importjs: "#.set(#, #)".}
+  ## https://developer.mozilla.org/en-US/docs/Web/API/Headers/set
+
+func clear*(this: Headers) {.importjs:
+  "(() => { const header = #; Array.from(header.keys()).forEach((key) => header.delete(key)) })()".}
+  ## Convenience func to delete all items from `Headers`.
+
+
+runnableExamples:
+  if defined(fusionJsHeadersTests):
+    let header = newHeaders()
+    header.add("key", "value")
+    doAssert header.hasKey("key")
+    doAssert header.keys() == @["key".cstring]
+    doAssert header.values() == @["value".cstring]
+    doAssert header["key"] == "value".cstring
+    header["other"] = "another".cstring
+    doAssert header["other"] == "another".cstring
+    doAssert header.entries() == @[["key".cstring, "value"], ["other".cstring, "another"]]
+    header.delete("other")
+    doAssert header.entries() == @[]