#136: Start working on database persistence

vendor/modernc.org/opt/AUTHORS

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+# This file lists authors for copyright purposes.  This file is distinct from
+# the CONTRIBUTORS files.  See the latter for an explanation.
+#
+# Names should be added to this file as:
+#     Name or Organization <email address>
+#
+# The email address is not required for organizations.
+#
+# Please keep the list sorted.
+
+Jan Mercl <0xjnml@gmail.com>

vendor/modernc.org/opt/CONTRIBUTORS

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+# This file lists people who contributed code to this repository.  The AUTHORS
+# file lists the copyright holders; this file lists people.
+#
+# Names should be added to this file like so:
+#     Name <email address>
+#
+# Please keep the list sorted.
+
+Jan Mercl <0xjnml@gmail.com>

vendor/modernc.org/opt/LICENSE

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+Copyright (c) 2019 The Opt Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the names of the authors nor the names of the
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/modernc.org/opt/Makefile

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+# Copyright 2019 The Opt Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+.PHONY:	all bench clean cover cpu editor internalError later mem nuke todo edit devbench
+
+grep=--include=*.go --include=*.l --include=*.y --include=*.yy
+ngrep='internalError\|TODOOK\|lexer\.go\|parser\.go\|ast.go\|trigraphs\.go\|.*_string\.go\|stringer\.go\|testdata\/gcc'
+
+all:
+	date
+	go version 2>&1 | tee log
+	./unconvert.sh
+	gofmt -l -s -w *.go
+	go test -i
+	go test 2>&1 | tee -a log
+	go install -v ./...
+	GOOS=linux GOARCH=arm go build
+	GOOS=linux GOARCH=386 go build
+	GOOS=linux GOARCH=amd64 go build
+	GOOS=windows GOARCH=386 go build
+	GOOS=windows GOARCH=amd64 go build
+	go vet 2>&1 | grep -v $(ngrep) || true
+	golint 2>&1 | grep -v $(ngrep) || true
+	make todo
+	misspell *.go
+	staticcheck | grep -v 'lexer\.go\|parser\.go' || true
+	maligned || true
+	grep -n 'FAIL\|PASS' log 
+	go version
+	date 2>&1 | tee -a log
+
+devbench:
+	date 2>&1 | tee log-devbench
+	go test -timeout 24h -dev -run @ -bench . 2>&1 | tee -a log-devbench
+	grep -n 'FAIL\|SKIP' log-devbench || true
+
+bench:
+	date 2>&1 | tee log-bench
+	go test -timeout 24h -v -run '^[^E]' -bench . 2>&1 | tee -a log-bench
+	grep -n 'FAIL\|SKIP' log-bench || true
+
+clean:
+	go clean
+	rm -f *~ *.test *.out
+
+cover:
+	t=$(shell mktemp) ; go test -coverprofile $$t && go tool cover -html $$t && unlink $$t
+
+cpu: clean
+	go test -run @ -bench . -cpuprofile cpu.out
+	go tool pprof -lines *.test cpu.out
+
+edit:
+	touch log
+	gvim -p Makefile *.go &
+
+editor:
+	gofmt -l -s -w *.go
+	go test -i
+	go test -short 2>&1 | tee log
+	go install
+
+later:
+	@grep -n $(grep) LATER * || true
+	@grep -n $(grep) MAYBE * || true
+
+mem: clean
+	go test -v -run ParserCS -memprofile mem.out -timeout 24h
+	go tool pprof -lines -web -alloc_space *.test mem.out
+
+nuke: clean
+	go clean -i
+
+todo:
+	@grep -nr $(grep) ^[[:space:]]*_[[:space:]]*=[[:space:]][[:alpha:]][[:alnum:]]* * | grep -v $(ngrep) || true
+	@grep -nr $(grep) 'TODO\|panic' * | grep -v $(ngrep) || true
+	@grep -nr $(grep) BUG * | grep -v $(ngrep) || true
+	@grep -nr $(grep) [^[:alpha:]]println * | grep -v $(ngrep) || true
+	@grep -nir $(grep) 'work.*progress' || true
+

vendor/modernc.org/opt/README.md

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+# opt
+
+Package opt implements command-line flag parsing.
+
+### Installation
+
+    $ go get [-u] modernc.org/opt
+
+### Documentation
+
+[godoc.org/modernc.org/opt](http://godoc.org/modernc.org/opt)

vendor/modernc.org/opt/go.mod

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+module modernc.org/opt
+
+go 1.13

vendor/modernc.org/opt/opt.go

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+// Package opt implements command-line flag parsing.
+package opt // import "modernc.org/opt"
+
+import (
+	"fmt"
+	"strings"
+)
+
+type opt struct {
+	handler func(opt, arg string) error
+	name    string
+
+	arg bool // Enable argument, e.g. `-I foo` or `-I=foo`
+}
+
+// A Set represents a set of defined options.
+type Set struct {
+	cfg map[string]*opt
+	imm []*opt
+}
+
+// NewSet returns a new, empty option set.
+func NewSet() *Set { return &Set{cfg: map[string]*opt{}} }
+
+// Opt defines a simple option, e.g. `-f`. When the option is found during
+// Parse, the handler is called with the value of the option, e.g. "-f".
+func (p *Set) Opt(name string, handler func(opt string) error) {
+	p.cfg[name] = &opt{
+		handler: func(opt, arg string) error { return handler(opt) },
+	}
+}
+
+// Arg defines a simple option with an argument, e.g. `-I foo` or `-I=foo`.
+// Setting imm argument enables additionally `-Ifoo`. When the option is found
+// during Parse, the handler is called with the values of the option and the
+// argument, e.g. "-I" and "foo" for all of the variants.
+func (p *Set) Arg(name string, imm bool, handler func(opt, arg string) error) {
+	switch {
+	case imm:
+		p.imm = append(p.imm, &opt{
+			handler: handler,
+			name:    name,
+		})
+	default:
+		p.cfg[name] = &opt{
+			arg:     true,
+			handler: handler,
+			name:    name,
+		}
+	}
+}
+
+// Parse parses opts. Must be called after all options are defined. The handler
+// is called for all items in opts that were not defined before using Opt or
+// Arg.
+//
+// If any handler returns a non-nil error, Parse will stop.  If the error is of
+// type Skip, the error returned by Parse will contain all the unprocessed
+// items of opts.
+//
+// The opts slice must not be modified by any handler while Parser is
+// executing.
+func (p *Set) Parse(opts []string, handler func(string) error) (err error) {
+	defer func() {
+		switch err.(type) {
+		case Skip:
+			err = Skip(opts)
+		}
+	}()
+
+	for len(opts) != 0 {
+		opt := opts[0]
+		opts = opts[1:]
+		var arg string
+	out:
+		switch {
+		case strings.HasPrefix(opt, "-"):
+			name := opt[1:]
+			for _, cfg := range p.imm {
+				if strings.HasPrefix(name, cfg.name) {
+					switch {
+					case name == cfg.name:
+						if len(opts) == 0 {
+							return fmt.Errorf("missing argument of %s", opt)
+						}
+
+						if err = cfg.handler(opt, opts[0]); err != nil {
+							return err
+						}
+
+						opts = opts[1:]
+					default:
+						if err = cfg.handler(opt[:len(cfg.name)+1], name[len(cfg.name):]); err != nil {
+							return err
+						}
+					}
+					break out
+				}
+			}
+
+			if n := strings.IndexByte(opt, '='); n > 0 {
+				arg = opt[n+1:]
+				name = opt[1:n]
+				opt = opt[:n]
+			}
+			switch cfg := p.cfg[name]; {
+			case cfg == nil:
+				if err = handler(opt); err != nil {
+					return err
+				}
+			default:
+				switch {
+				case cfg.arg:
+					switch {
+					case arg != "":
+						if err = cfg.handler(opt, arg); err != nil {
+							return err
+						}
+					default:
+						if len(opts) == 0 {
+							return fmt.Errorf("missing argument of %s", opt)
+						}
+
+						if err = cfg.handler(opt, opts[0]); err != nil {
+							return err
+						}
+
+						opts = opts[1:]
+					}
+				default:
+					if err = cfg.handler(opt, ""); err != nil {
+						return err
+					}
+				}
+			}
+		default:
+			if opt == "" {
+				break
+			}
+
+			if err = handler(opt); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// Skip is an error that contains all unprocessed items passed to Parse.
+type Skip []string
+
+func (s Skip) Error() string { return fmt.Sprint([]string(s)) }

vendor/modernc.org/opt/unconvert.sh

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+until unconvert -fastmath . &> /dev/null
+do
+	unconvert -fastmath -apply . &> /dev/null
+done