basic distribution w/ push/pull (#78)

* basic distribution w/ push/pull

* add the parser

* add create, pull, and push

* changes to the parser, FROM line, and fix commands

* mkdirp new manifest directories

* make `blobs` directory if it does not exist

* fix go warnings

* add progressbar for model pulls

* move model struct

---------

Co-authored-by: Jeffrey Morgan <jmorganca@gmail.com>

parser/parser.go

@@ -0,0 +1,77 @@
+package parser
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"strings"
+)
+
+type Command struct {
+	Name string
+	Arg  string
+}
+
+func Parse(reader io.Reader) ([]Command, error) {
+	var commands []Command
+	var foundModel bool
+
+	scanner := bufio.NewScanner(reader)
+	multiline := false
+	var multilineCommand *Command
+	for scanner.Scan() {
+		line := scanner.Text()
+		if multiline {
+			// If we're in a multiline string and the line is """, end the multiline string.
+			if strings.TrimSpace(line) == `"""` {
+				multiline = false
+				commands = append(commands, *multilineCommand)
+			} else {
+				// Otherwise, append the line to the multiline string.
+				multilineCommand.Arg += "\n" + line
+			}
+			continue
+		}
+		fields := strings.Fields(line)
+		if len(fields) == 0 {
+			continue
+		}
+
+		command := Command{}
+		switch fields[0] {
+		case "FROM":
+			command.Name = "model"
+			command.Arg = fields[1]
+			if command.Arg == "" {
+				return nil, fmt.Errorf("no model specified in FROM line")
+			}
+			foundModel = true
+		case "PROMPT":
+			command.Name = "prompt"
+			if fields[1] == `"""` {
+				multiline = true
+				multilineCommand = &command
+				multilineCommand.Arg = ""
+			} else {
+				command.Arg = strings.Join(fields[1:], " ")
+			}
+		case "PARAMETER":
+			command.Name = fields[1]
+			command.Arg = strings.Join(fields[2:], " ")
+		default:
+			continue
+		}
+		if !multiline {
+			commands = append(commands, command)
+		}
+	}
+
+	if !foundModel {
+		return nil, fmt.Errorf("no FROM line for the model was specified")
+	}
+
+	if multiline {
+		return nil, fmt.Errorf("unclosed multiline string")
+	}
+	return commands, scanner.Err()
+}