Initial commit: create verb only.

.gitignore

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+nimcache/
+*.sw?
+build/
+db_migrate

README.md

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+Nim DB Migrate
+==============
+
+Small tool to manage database migrations in Nim.

db_migrate.nim

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+## DB Migrate
+## ==========
+##
+## Simple tool to manage database migrations.
+
+import json, times, os, docopt
+
+type DbMigrateConfig* = tuple[ driver, sqlDir, connectionString: string ]
+
+proc loadConfig*(filename: string): DbMigrateConfig =
+  let cfg = json.parseFile(filename)
+  let config = (
+    driver: if cfg.hasKey("driver"): cfg["driver"].getStr else: "postres",
+    sqlDir: if cfg.hasKey("sqlDir"): cfg["sqlDir"].getStr else: "migrations",
+    connectionString: cfg["connectionString"].getStr)
+
+  # Check for migrations directory
+  # TODO: try/except
+  if not existsDir config.sqlDir:
+    echo "SQL directory '" & config.sqlDir &
+      "' does not exist and will be created."
+    createDir config.sqlDir
+
+  return config
+
+proc createMigration*(config: DBMigrateConfig, migrationName: string): seq[string] =
+  let timestamp = getTime().getLocalTime().format("yyyyMMddHHmmss")
+  let filenamePrefix =  timestamp & "-" & migrationName
+
+  let upFilename = joinPath(config.sqlDir, filenamePrefix & "-up.sql")
+  let downFilename = joinPath(config.sqlDir, filenamePrefix & "-down.sql")
+
+  let scriptDesc = migrationName & " (" & timestamp & ")"
+
+  # TODO: try/except and catch errors creating files.
+  let upFile = open(upFilename, fmWrite)
+  let downFile = open(downFilename, fmWrite)
+
+  upFile.writeLine "-- UP script for " & scriptDesc
+  downFile.writeLine "-- DOWN script for " & scriptDesc
+
+  upFile.close()
+  downFile.close()
+
+  return @[upFilename, downFilename]
+
+when isMainModule:
+  let doc = """
+Usage:
+  db-migrate [options] create <migration-name>
+
+Options:
+  -c --config <config-file>   Use the given configuration file (defaults to 
+                              "database.json").
+"""
+
+  # Parse arguments
+  let args = docopt(doc, version = "db-migrate 0.1.0")
+
+  echo $args
+
+  # Load configuration file
+  let configFilename =
+    if args["--config"]: $args["--config"]
+    else: "database.json"
+
+  let config = loadConfig(configFilename)
+
+  # Execute commands
+  if args["create"]:
+    let filesCreated = createMigration(config, $args["<migration-name>"])
+    echo "Created new migration files:"
+    for filename in filesCreated: echo "\t" & filename

db_migrate.nimble

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+# Package
+
+bin           = @["db_migrate"]
+version       = "0.1.0"
+author        = "Jonathan Bernard"
+description   = "Simple tool to handle database migrations."
+license       = "BSD"
+
+# Dependencies
+
+requires: @["nim >= 0.13.0", "docopt >= 0.1.0"]
+