3 files changed, 187 insertions, 0 deletions
diff --git a/src/core/locker.nim b/src/core/locker.nim
new file mode 100644
index 0000000..d52b55d
--- /dev/null
+++ b/src/core/locker.nim
@@ -0,0 +1,102 @@
+import std / [
+  os,
+  json,
+  hashes,
+  strformat
+]
+
+import ./manager
+
+proc lockPath*(): string =
+  let
+    homeDir: string = getHomeDir()
+    lockDir: string = homeDir / ".local" / "tesserae"
+  ensureDir(lockDir)
+  result = lockDir / "tesserae.lock"
+
+proc loadLock*(): JsonNode =
+  let lockFile: string = lockPath()
+  result = %*{}
+  if fileExists(lockFile):
+    try:
+      result = parseFile(lockFile)
+    except JsonParsingError:
+      echo "JsonParsingError. Treating the lockfile as non existant"
+      result = %*{}
+
+proc writeLock*(jsonObject: JsonNode) =
+  let lockFile: string = lockPath()
+  writeFile(lockFile, jsonObject.pretty())
+
+proc updateLock*(
+  packageName: string,
+  sourceURL: string,
+  chosenTag: string,
+  configPath: string
+) =
+  ## Updates the lockfile
+  var lock: JsonNode = loadLock()
+  let
+    config: string = readConfigFile(configPath)
+    jsonObject: JsonNode = %*{
+      "source": { "url": sourceURL },
+      "tag": chosenTag,
+      "config": config
+      # I should probably add a sha256 thingy
+    }
+  lock[packageName] = jsonObject
+  writeLock(lock)
+  echo "Updated {packageName}".fmt
+  
+
+proc needRebuildLock*(
+  packageName: string,
+  sourceURL: string,
+  chosenTag: string, 
+  configPath: string
+): bool =
+  ## Checks whether the following have changed:\n
+  ## - source (repo url)
+  ## - tag (new release, manually updated, etc)
+  result = false
+  let lockFile = loadLock()
+  if not lockFile.hasKey(packageName):
+    echo "{packageName} added to queue"
+    result = true
+  else:
+    let package = lockFile[packageName]
+    if not package.hasKey("source"):
+      echo "Could not find source for package {packageName}".fmt
+      echo "{packageName} added to queue"
+      result = true
+      
+    if package.hasKey("source") and package["source"].hasKey("url"):
+      let packageSource: string = package["source"]["url"].getStr
+      if packageSource != sourceURL:
+        echo "Source URL for package {packageName} has changed".fmt
+        echo "{packageName} added to queue"
+        result = true
+
+    if not package.hasKey("tag"):
+      result = true
+    else:
+      if package["tag"].getStr != chosenTag:
+        echo "Release tag has changed from {package["tag"]} -> {chosenTag}".fmt
+        echo "{packageName} added to queue"
+        result = true
+    if not package.hasKey("config"):
+      echo "Configuration file not found for package {packageName}".fmt
+      echo "{packageName} added to queue"
+      result = true
+    else:
+      let config: string = readConfigFile(configPath)
+      if package["config"].getStr != config:
+        echo "Configuration file changed for package {packageName}".fmt
+        echo "{packageName} added to queue"
+        result = true
+
+
+
+
+
+    
diff --git a/src/core/manager.nim b/src/core/manager.nim
new file mode 100644
index 0000000..0453fa6
--- /dev/null
+++ b/src/core/manager.nim
@@ -0,0 +1,84 @@
+import std / [ os, strformat, osproc ]
+
+proc runCommand*(
+  command: string,
+  workingDir: string = ""
+): (string, int) =
+  echo "-> {command} (workingDir: {workingDir})".fmt
+  let (output, code) = execCmdEx(
+    command=command,
+    workingDir=workingDir
+  )
+  result = (output, code)
+
+proc ensureDir*(path: string) =
+  if not dirExists(path):
+    createDir(path)
+
+proc readConfigFile*(configPath: string): string =
+  if fileExists(configPath):
+    result = readFile(configPath)
+  else:
+    result = ""
+    
+proc cloneSource*(
+  repoURL: string,
+  destinationDir: string
+) =
+  if dirExists(destinationDir):
+    echo "Repository already exists at {destinationDir}".fmt
+    echo "Pulling..."
+    let (output, code) = runCommand(
+      command="git pull",
+      workingDir=destinationDir
+    )
+    echo output
+  else:
+    echo "Cloning from {repoURL}...".fmt
+    let (output, code) = runCommand(
+      command="git clone {repoURL} {destinationDir}".fmt
+    )
+    echo output
+
+proc fetchTags*(
+  destinationDir: string
+) =
+  let (output, code) = runCommand(
+    command="git fetch --tags --force",
+    workingDir=destinationDir
+  )
+  echo output
+
+
+proc resolveTag*(
+  destinationDir: string,
+  pinnedTag: string = ""
+): string =
+  ## if pinnedTag is defined, we use that;
+  ## otherwise we fall back to newest tag
+  if pinnedTag.len > 0:
+    result = pinnedTag
+    let (output, code) = runCommand(
+      command="git rev-parse --verify {pinnedTag}".fmt,
+      workingDir=destinationDir
+    )
+    echo output
+    if code != 0:
+      # if it fails, we try to fetch the tag
+      # just in case
+      fetchTags(destinationDir)
+      let (newOutput, newCode) = runCommand(
+        "git rev-parse --verify {pinnedTag}".fmt,
+        workingDir=destinationdir
+      )
+      echo newOutput
+      if newCode != 0:
+        quit("Pinned tag {pinnedTag} not found in repo at {destDir}.")
+  else:
+    let (output, code) = runCommand(
+      command="git describe --tags --abbrev=0",
+      workingDir=destinationDir
+    )
+    result = output
+    if code != 0:
+      quit("There seem to be no releases available from this software")
diff --git a/src/core/parser.nim b/src/core/parser.nim
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/core/parser.nim
@@ -0,0 +1 @@
+