added core functionality bar the parser for dependencies

1 files changed, 84 insertions, 0 deletions

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")