Cannonicalize output

.gitignore

@@ -0,0 +1 @@
+/nim.cfg

Tupfile

@@ -1,2 +0,0 @@
-include_rules
-: |> !nim_lk |>

Tuprules.tup

@@ -1 +1,2 @@
 NIM_FLAGS += --path:$(TUP_CWD)/../nim/v1.6.8
+NIM_FLAGS += --path:$(TUP_CWD)/../preserves-nim/src

lock.json

@@ -1 +1 @@
-{"depends":[]}
+{"depends":[{"method":"fetchzip","packages":["npeg"],"path":"/nix/store/ffkxmjmigfs7zhhiiqm0iw2c34smyciy-source","ref":"1.2.1","rev":"26d62fdc40feb84c6533956dc11d5ee9ea9b6c09","sha256":"0xpzifjkfp49w76qmaylan8q181bs45anmp46l4bwr3lkrr7bpwh","srcDir":"src","url":"https://github.com/zevv/npeg/archive/26d62fdc40feb84c6533956dc11d5ee9ea9b6c09.tar.gz"},{"method":"fetchzip","packages":["preserves"],"path":"/nix/store/nrxd0z8mxmdphw49c6p4n9lmmq0iq5pq-source","ref":"20231019","rev":"a2dc5becc0596d52ab205d869b7c167c0b562fb4","sha256":"09jygr7ynzh6vp2p54dgq2qz651d3lgvypkjwjp74zzp3jgwz7g5","srcDir":"src","url":"https://git.syndicate-lang.org/ehmry/preserves-nim/archive/a2dc5becc0596d52ab205d869b7c167c0b562fb4.tar.gz"}]}

nim_lk.nimble

@@ -3,6 +3,6 @@ bin = @["nim_lk"]
 description = "Tool for generating Nim lockfiles"
 license = "BSD-3-Clause"
 srcDir = "src"
-version = "20231009"
+version = "20231020"
 
-requires "nim >= 2.0.0"
+requires "nim >= 2.0.0", "preserves >= 20231020"

src/nim_lk.nim

@@ -8,10 +8,13 @@ import nimblepkg/common,
   nimblepkg/version
 
 import std/[algorithm, deques, httpclient, json, os, osproc, parseutils, streams, strutils, uri]
+import preserves
 
 const githubPackagesUrl =
   "https://raw.githubusercontent.com/nim-lang/packages/master/packages.json"
 
+type Preserve = preserves.Preserve[void]
+
 proc registryCachePath: string =
   result = getEnv("XDG_CACHE_HOME")
   if result == "":
@@ -78,8 +81,17 @@ proc matchRev(url: string; wanted: VersionRange): tuple[tag: string, rev: string
       result = pairs[pairs.high]
     doAssert result.rev != "", url
 
-proc collectMetadata(data: JsonNode) =
-  let storePath = data["path"].getStr
+proc `[]`(dict: Preserve; key: string): Preserve =
+  dict[key.toPreserve]
+
+proc `[]=`(dict: var Preserve; key: string; val: Preserve) =
+  dict[key.toPreserve] = val
+
+proc `[]=`(dict: var Preserve; key: string; val: string) =
+  dict[key.toPreserve] = val.toPreserve
+
+proc collectMetadata(data: var Preserve) =
+  let storePath = data["path"].string
   var packageNames = newSeq[string]()
   for (kind, path) in walkDir(storePath):
     if kind in {pcFile, pcLinkToFile} and path.endsWith(".nimble"):
@@ -88,13 +100,13 @@ proc collectMetadata(data: JsonNode) =
   if packageNames.len == 0:
     quit("no .nimble files found in " & storePath)
   sort(packageNames)
-  data["packages"] = %packageNames
+  data["packages"] = packageNames.toPreserve(void)
   var
     nimbleFilePath = findNimbleFile(storePath, true)
     pkg = readPackageInfo(nimbleFilePath, parseCmdLine())
-  data["srcDir"] = %pkg.srcDir
+  data["srcDir"] = pkg.srcDir.toPreserve
 
-proc prefetchGit(uri: Uri; version: VersionRange): JsonNode =
+proc prefetchGit(uri: Uri; version: VersionRange): Preserve =
   var
     uri = uri
     subdir = ""
@@ -128,14 +140,14 @@ proc prefetchGit(uri: Uri; version: VersionRange): JsonNode =
     off.inc parseUntil(lines, hash, {'\n'}, off).succ
     off.inc parseUntil(lines, storePath, {'\n'}, off).succ
     doAssert off == lines.len, "unrecognized nix-prefetch-url output:\n" & lines
-    result = newJObject()
-    result["method"] = %"fetchzip"
-    result["path"] = %storePath
-    result["rev"] = %rev
-    result["sha256"] = %hash
-    result["url"] = %archiveUrl
+    result = initDictionary()
+    result["method"] = "fetchzip"
+    result["path"] = storePath
+    result["rev"] = rev
+    result["sha256"] = hash
+    result["url"] = archiveUrl
     if subdir != "":
-      result["subdir"] = %* subdir
+      result["subdir"] = subdir
   else:
     stderr.writeLine "fetch of ", archiveUrl, " returned ", resp.code
     var args = @["--quiet", "--fetch-submodules", "--url", cloneUrl, "--rev", rev]
@@ -144,26 +156,26 @@ proc prefetchGit(uri: Uri; version: VersionRange): JsonNode =
       "nix-prefetch-git",
       args = args,
       options = {poUsePath})
-    try: result = parseJson dump
-    except JsonParsingError:
+    try: result = parsePreserves dump
+    except CatchableError:
       stderr.writeLine "failed to parse output of nix-prefetch-git ", join(args, " ")
       quit(dump)
     if subdir != "":
-      result["subdir"] = %* subdir
-    result["method"] = %"git"
+      result["subdir"] = subdir
+    result["method"] = "git"
   if tag != "":
-    result["ref"] = %tag
+    result["ref"] = tag
   collectMetadata(result)
 
-proc containsPackageUri(lockAttrs: JsonNode; pkgUri: string): bool =
+proc containsPackageUri(lockAttrs: Preserve; pkgUri: string): bool =
   for e in lockAttrs.items:
-    if e["url"].getStr == pkgUri:
+    if e["url".toPreserve].string == pkgUri:
       return true
 
-proc containsPackage(lockAttrs: JsonNode; pkgName: string): bool =
+proc containsPackage(lockAttrs: Preserve; pkgName: string): bool =
   for e in lockAttrs.items:
     for other in e["packages"].items:
-      if pkgName == other.getStr:
+      if pkgName == other.string:
         return true
 
 proc collectRequires(pending: var Deque[PkgTuple]; pkgPath: string) =
@@ -205,16 +217,16 @@ proc getPackgeUri(name: string): tuple[uri: string, meth: string] =
           quit("Failed to parse shit JSON " & $e)
     inc i
 
-proc generateLockfile(): JsonNode =
-  result = newJObject()
+proc generateLockfile(): Preserve =
+  result = initDictionary()
   var
-    deps = newJArray()
+    deps = initSequence()
     pending: Deque[PkgTuple]
   collectRequires(pending, getCurrentDir())
   while pending.len > 0:
     let batchLen = pending.len
     for i in 1..batchLen:
-      var pkgData: JsonNode
+      var pkgData: Preserve
       let pkg = pending.popFirst()
       if pkg.name == "nim" or pkg.name == "compiler":
         continue
@@ -227,12 +239,12 @@ proc generateLockfile(): JsonNode =
           pkgData = prefetchGit(uri, pkg.ver)
         else:
           quit("unhandled URI " & $uri)
-        collectRequires(pending, pkgData["path"].getStr)
-        deps.add pkgData
+        collectRequires(pending, pkgData["path"].string)
+        deps.sequence.add pkgData
 
     if batchLen == pending.len:
       var
-        pkgData: JsonNode
+        pkgData: Preserve
         pkg = pending.popFirst()
         info = getPackgeUri(pkg.name)
         uri = parseUri info.uri
@@ -241,13 +253,14 @@ proc generateLockfile(): JsonNode =
         pkgData = prefetchGit(uri, pkg.ver)
       else:
         quit("unhandled fetch method " & $info.meth & " for " & info.uri)
-      collectRequires(pending, pkgData["path"].getStr)
-      deps.add pkgData
-  sort(deps.elems)
-  result["depends"] = deps
+      collectRequires(pending, pkgData["path"].string)
+      deps.sequence.add pkgData
+  sort(deps.sequence)
+  result["depends".toPreserve] = deps
 
 proc main =
   var lockInfo = generateLockfile()
+  cannonicalize(lockInfo)
   stdout.writeLine lockInfo
 
 main()