koch: bundle nim-lang/fusion with Nim (#15061)

Initial work on bundling nim-lang/fusion as part of the Nim distribution.

koch.nim

@@ -11,6 +11,7 @@
 
 const
   NimbleStableCommit = "e5d340df8cf26f89ad2c9f0bc081ecd7e0323b0a" # master
+  FusionStableCommit = "88100a2f45860e98850f7a62fe0b11c37c7a86a1"
 
 when not defined(windows):
   const
@@ -50,8 +51,10 @@ Usage:
   koch [options] command [options for command]
 Options:
   --help, -h               shows this help and quits
-  --latest                 bundle the installers with a bleeding edge Nimble
-  --stable                 bundle the installers with a stable Nimble (default)
+  --latest                 bundle the installers with bleeding edge versions of
+                           external components.
+  --stable                 bundle the installers with stable versions of
+                           external components (default).
   --nim:path               use specified path for nim binary
   --localdocs[:path]       only build local documentations. If a path is not
                            specified (or empty), the default is used.
@@ -59,9 +62,11 @@ Possible Commands:
   boot [options]           bootstraps with given command line options
   distrohelper [bindir]    helper for distro packagers
   tools                    builds Nim related tools
-  toolsNoNimble            builds Nim related tools (except nimble)
+  toolsNoExternal          builds Nim related tools (except external tools,
+                           ie. nimble)
                            doesn't require network connectivity
   nimble                   builds the Nimble tool
+  fusion                   clone fusion into the working tree
 Boot options:
   -d:release               produce a release version of the compiler
   -d:nimUseLinenoise       use the linenoise library for interactive mode
@@ -194,7 +199,13 @@ proc bundleWinTools(args: string) =
     nimCompile(r"tools\downloader.nim",
                options = r"--cc:vcc --app:gui -d:ssl --noNimblePath --path:..\ui " & args)
 
+proc bundleFusion(latest: bool) =
+  let commit = if latest: "HEAD" else: FusionStableCommit
+  cloneDependency(distDir, "https://github.com/nim-lang/fusion.git", commit)
+  copyDir(distDir / "fusion" / "src" / "fusion", "lib" / "fusion")
+
 proc zip(latest: bool; args: string) =
+  bundleFusion(latest)
   bundleNimbleExe(latest, args)
   bundleNimsuggest(args)
   bundleNimpretty(args)
@@ -234,6 +245,7 @@ proc buildTools(args: string = "") =
                  options = "-d:release " & args)
 
 proc nsis(latest: bool; args: string) =
+  bundleFusion(latest)
   bundleNimbleExe(latest, args)
   bundleNimsuggest(args)
   bundleWinTools(args)
@@ -693,15 +705,18 @@ when isMainModule:
       of "wintools": bundleWinTools(op.cmdLineRest)
       of "nimble": buildNimble(latest, op.cmdLineRest)
       of "nimsuggest": bundleNimsuggest(op.cmdLineRest)
-      of "toolsnonimble":
+      # toolsNoNimble is kept for backward compatibility with build scripts
+      of "toolsnonimble", "toolsnoexternal":
         buildTools(op.cmdLineRest)
       of "tools":
         buildTools(op.cmdLineRest)
         buildNimble(latest, op.cmdLineRest)
+        bundleFusion(latest)
       of "pushcsource", "pushcsources": pushCsources()
       of "valgrind": valgrind(op.cmdLineRest)
       of "c2nim": bundleC2nim(op.cmdLineRest)
       of "drnim": buildDrNim(op.cmdLineRest)
+      of "fusion": bundleFusion(latest)
       else: showHelp()
       break
     of cmdEnd: break