fixes #1345 Restructure the source tree

This is not quite complete, but it sets the stage for other
protocols (such as zmq or mqtt) to be added to the project.

5 files changed, 805 insertions, 42 deletions

diff --git a/etc/README.adoc b/etc/README.adoc
index 06afa3fa..74723313 100644
--- a/etc/README.adoc
+++ b/etc/README.adoc
@@ -1,12 +1,9 @@
-About This Directory
-====================
+= About This Directory
 
 This directory contains support files that I use for developing this
-project.  I recommend others consider doing the same.
+project.
 
-
-Coding Style
-~~~~~~~~~~~~~~~~~~~~~~~~~
+== Coding Style
 
 A clang-format configuration file is included in the project, you should
 use that.  (clang format requires that the style file live at the top of
@@ -17,55 +14,30 @@ the Convey framework has a style all it's own.
 The style is based loosely on WebKit, but is really modified -- someday
 if clang-format ever learns about BSD KNF I'll probably switch to that.
 
-Once upon a time this used uncrustify. However, the frequent breaking changes
-in uncrustify versions, and the fact that the latest (at this time 0.65) does
-not actually support one of the most common language constructs (extern "C"
-opening braces) has driven me towards clang-format.  The good news is that
-this is probably actually easier for most folks to use.
-
-
-Sublime Text
-~~~~~~~~~~~~
+== Sublime Text
 
 I've also arranged for Sublime text to understand that .h is C, not C++ (this
 is important!)
 
+Having said that, these days I do most development on this project using CLion
+from JetBrains.
 
-ISO Standard C
-~~~~~~~~~~~~~~
+== ISO Standard C 99
 
-I've decided, after some gnashing of teeth, to finally accept that C99
-is here to stay.  Therefore, I'm *not* spending any effort into supporting
-older C89/C90 compilers.  That said I do understand that compiler support
-for C99 is not always complete.  I will stick to the mainstream features,
-like <stdint.h>, the ability to use variadic macros, // comments, and perhaps
-the occasional use of for() locally scoped variables.
+This project uses C99. You may need to have modern compilers and
+a modern SDK.  (Famously Windows Visual Studio releases older than
+2015 will either work poorly, or not at all.)
 
-We also insist that you have working vsnprintf, snprintf.  Microsoft famously
-did not, or worse, had broken ones (that didn't guarantee NULL termination).
-Visual Studio 2015 reportedly fixes this.  Building with older versions of
-Visual Studio for Microsoft platforms may leave you with some brittle code
-that could break in some bad ways -- use the latest to avoid this issue.
-(I'm not aware of any other platform with this kind of brain damage.)
+== Naming Conventions
 
-Naming Conventions
-~~~~~~~~~~~~~~~~~~
-
-Because not everyone wants to deal with CMake all the time, I anticipate that
-there will be folks who in the future want to just create one monster .c
-file that contains all these things, or even a .h that they just inline into
-their programmer.  As vile as this idea seems to me, I can understand the
-motivations for it.  In order to facilitate those cases, its important that
-all global symbols use names prefixed with nni_ or nng_ (or NNI_ or NNG_ for
-macro names).  This is true even for static symbols that won't show up in
-a more conventional symbol table.
-
-We use nng_ (and NNG_) for symbols that are intended to be expoed to consumers.
+We use nng_ (and NNG_) for symbols that are intended to be exported to consumers.
 These symbols form part of our public API.
 
 We use nni_ and NNI_ for symbols that are *NOT* part of our public API and
 should not be used by users.
 
+Statics may have any non-conflicting name.
+
 Note that for the most part we try to avoid exposing structures directly to
 users so that they don't get baked into binaries -- preferring instead to
 dynamically allocate and give back an opaque pointer to the API.  Any
diff --git a/etc/pubrefman/README.adoc b/etc/pubrefman/README.adoc
new file mode 100644
index 00000000..a8929df9
--- /dev/null
+++ b/etc/pubrefman/README.adoc
@@ -0,0 +1,10 @@
+= pubrefman
+
+This directory contains a tool to publish (update) the reference manual
+on the NNG documentation site.
+
+Run it with --help for options.  You can build it with Go.
+
+It normally uploads to github, and will require a working SSH agent.
+
+If you're not a project maintainer, you probably don't need this tool.
diff --git a/etc/pubrefman/go.mod b/etc/pubrefman/go.mod
new file mode 100644
index 00000000..b181f172
--- /dev/null
+++ b/etc/pubrefman/go.mod
@@ -0,0 +1,11 @@
+module go.nanomsg.org/nng/pubrefman
+
+go 1.14
+
+require (
+	github.com/bytesparadise/libasciidoc v0.3.1-0.20200802124845-5dcda3220c31
+	github.com/go-git/go-billy/v5 v5.0.0
+	github.com/go-git/go-git/v5 v5.1.0
+	github.com/google/uuid v1.1.1
+	github.com/spf13/jwalterweatherman v1.0.0
+)
diff --git a/etc/pubrefman/go.sum b/etc/pubrefman/go.sum
new file mode 100644
index 00000000..3d9237e3
--- /dev/null
+++ b/etc/pubrefman/go.sum
@@ -0,0 +1,277 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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diff --git a/etc/pubrefman/pubrefman.go b/etc/pubrefman/pubrefman.go
new file mode 100644
index 00000000..9ed3f5af
--- /dev/null
+++ b/etc/pubrefman/pubrefman.go
@@ -0,0 +1,493 @@
+// Copyright 2020 Staysail Systems, Inc.
+//
+// This software is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt).  A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/bytesparadise/libasciidoc"
+	"github.com/bytesparadise/libasciidoc/pkg/configuration"
+	"github.com/go-git/go-billy/v5"
+	"github.com/go-git/go-billy/v5/memfs"
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+	"github.com/go-git/go-git/v5/storage/memory"
+	"github.com/google/uuid"
+	jww "github.com/spf13/jwalterweatherman"
+)
+
+type Configuration struct {
+	Version string
+	Debug   bool
+	Trace   bool
+	Quiet   bool
+	DryRun  bool
+	Author  string
+	Email   string
+	Url     string
+	Message string
+}
+
+var Config Configuration
+
+func init() {
+	flag.StringVar(&Config.Version, "v", "tip", "Version to publish")
+	flag.BoolVar(&Config.Debug, "d", false, "Enable debugging")
+	flag.BoolVar(&Config.Trace, "t", false, "Enable tracing")
+	flag.BoolVar(&Config.Quiet, "q", false, "Run quietly")
+	flag.BoolVar(&Config.DryRun, "n", false, "Dry run, does not push changes")
+	flag.StringVar(&Config.Url, "u", "ssh://git@github.com/nanomsg/nng.git", "URL of repo to publish from")
+	flag.StringVar(&Config.Email, "E", "info@staysail.tech", "Author email for commit")
+	flag.StringVar(&Config.Author, "A", "Staysail Systems, Inc.", "Author name for commit")
+	flag.StringVar(&Config.Message, "m", "", "Commit message")
+}
+
+func (g *Global) CheckError(err error, prefix string, args ...interface{}) {
+	if err == nil {
+		g.Log.TRACE.Printf("%s: ok", fmt.Sprintf(prefix, args...))
+		return
+	}
+	g.Log.FATAL.Fatalf("Error: %s: %v", fmt.Sprintf(prefix, args...), err)
+}
+
+func (g *Global) Fatal(format string, args ...interface{}) {
+	g.Log.FATAL.Fatalf("Error: %s", fmt.Sprintf(format, args...))
+}
+
+type Section struct {
+	Name        string
+	Synopsis    string
+	Description string
+	Pages       []*Page
+}
+
+type Page struct {
+	Name        string
+	Section     string
+	Description string
+	Content     string
+}
+
+type Global struct {
+	Config   Configuration
+	SrcFs    billy.Filesystem
+	DstFs    billy.Filesystem
+	DstDir   string
+	LaConfig configuration.Configuration
+	Sections map[string]*Section
+	Pages    map[string]*Page
+	Repo     *git.Repository
+	Index    string
+	ToC      string
+	Added    map[string]bool
+	WorkTree *git.Worktree
+	Branch   string
+	OldHash  plumbing.Hash
+	NewHash  plumbing.Hash
+	Log      *jww.Notepad
+}
+
+func (g *Global) Init() {
+	g.Config = Config
+	g.Sections = make(map[string]*Section)
+	g.Pages = make(map[string]*Page)
+	g.Added = make(map[string]bool)
+	g.SrcFs = memfs.New()
+	g.DstFs = memfs.New()
+	g.DstDir = path.Join("man", g.Config.Version)
+	g.LaConfig = configuration.Configuration{
+		AttributeOverrides: map[string]string{
+			"nofooter":           "yes",
+			"icons":              "font",
+			"linkcss":            "yes",
+			"source-highlighter": "pygments",
+		},
+	}
+	thresh := jww.LevelInfo
+	if g.Config.Quiet {
+		thresh = jww.LevelError
+	}
+	if g.Config.Debug {
+		thresh = jww.LevelDebug
+	}
+	if g.Config.Trace {
+		thresh = jww.LevelTrace
+	}
+	g.Log = jww.NewNotepad(thresh, thresh, os.Stdout, ioutil.Discard, "", log.Ldate|log.Ltime)
+}
+
+func (g *Global) Destroy() {
+}
+
+func (g *Global) Debug(format string, args ...interface{}) {
+	g.Log.DEBUG.Printf(format, args...)
+}
+
+func (g *Global) Print(format string, args ...interface{}) {
+	g.Log.INFO.Printf(format, args...)
+}
+
+func (g *Global) CloneSource() {
+	tag := g.Config.Version
+	if tag == "" || tag == "tip" {
+		tag = "master"
+	}
+	ref := plumbing.NewBranchReferenceName(tag)
+	if strings.HasPrefix(tag, "v") {
+		ref = plumbing.NewTagReferenceName(tag)
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+
+	now := time.Now()
+	_, err := git.CloneContext(ctx, memory.NewStorage(), g.SrcFs, &git.CloneOptions{
+		URL:           g.Config.Url,
+		ReferenceName: ref,
+	})
+	g.CheckError(err, "clone source")
+	g.Debug("Cloned source (%s) in %v", tag, time.Since(now))
+}
+
+func (g *Global) ClonePages() {
+	ref := plumbing.NewBranchReferenceName("gh-pages")
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+
+	now := time.Now()
+	repo, err := git.CloneContext(ctx, memory.NewStorage(), g.DstFs, &git.CloneOptions{
+		URL:           g.Config.Url,
+		ReferenceName: ref,
+		RemoteName:    "origin",
+	})
+	g.CheckError(err, "clone gh-pages")
+	g.Repo = repo
+	g.Debug("Cloned pages in %v", time.Since(now))
+}
+
+func (g *Global) ProcessManPage(page os.FileInfo) {
+	source := g.ReadFile(page.Name())
+	// Let's look for the description
+	inName := false
+	desc := ""
+	name := ""
+	for _, line := range strings.Split(source, "\n") {
+		line = strings.TrimRight(line, " \t\r")
+		if line == "" {
+			continue
+		}
+		if line == "== NAME" {
+			inName = true
+			continue
+		}
+		if inName {
+			w := strings.SplitN(line, " - ", 2)
+			if len(w) != 2 || w[1] == "" {
+				g.Fatal("page %s NAME malformed", page.Name())
+			}
+			name = w[0]
+			desc = w[1]
+			strings.TrimSpace(name)
+			strings.TrimSpace(desc)
+			break
+		}
+	}
+
+	if desc == "" {
+		g.Fatal("page %s NAME missing", page.Name())
+	}
+
+	html := &strings.Builder{}
+
+	// Emit the title, as we are not letting libasciidoc do it (stripping headers)
+	cfg := g.LaConfig
+	cfg.Filename = page.Name()
+	cfg.LastUpdated = page.ModTime()
+	metadata, err := libasciidoc.Convert(strings.NewReader(source), html, cfg)
+	g.CheckError(err, "processing page %s", page.Name())
+	w := strings.SplitN(metadata.Title, "(", 2)
+	sect := strings.TrimSuffix(w[1], ")")
+	if len(w) != 2 || name != w[0] || !strings.HasSuffix(w[1], ")") {
+		g.Fatal("page %s title incorrect (%s)", page.Name(), name)
+	}
+	if page.Name() != name+"."+sect+".adoc" {
+		g.Fatal("page %s(%s) does not match file name %s", name, sect, page.Name())
+	}
+	result := &strings.Builder{}
+	_, _ = fmt.Fprintf(result, "---\n")
+	_, _ = fmt.Fprintf(result, "version: %s\n", g.Config.Version)
+	_, _ = fmt.Fprintf(result, "layout: %s\n", "manpage_v2")
+	_, _ = fmt.Fprintf(result, "---\n")
+	_, _ = fmt.Fprintf(result, "<h1>%s(%s)</h1>\n", name, sect)
+	result.WriteString(html.String())
+
+	g.Pages[page.Name()] = &Page{
+		Name:        name,
+		Section:     sect,
+		Description: desc,
+		Content:     result.String(),
+	}
+	g.Log.TRACE.Printf("HTML for %s:\n%s\n", name, result.String())
+}
+
+func (g *Global) ReadFile(name string) string {
+	f, err := g.SrcFs.Open(path.Join("docs/man", name))
+	g.CheckError(err, "open file %s", name)
+	b, err := ioutil.ReadAll(f)
+	g.CheckError(err, "read file %s", name)
+	return string(b)
+}
+
+func (g *Global) LoadSection(name string) {
+	section := strings.TrimPrefix(name, "man")
+
+	g.Sections[section] = &Section{
+		Name:        section,
+		Synopsis:    g.ReadFile(name + ".sect"),
+		Description: g.ReadFile(name + ".desc"),
+	}
+}
+
+func (g *Global) ProcessSource() {
+	pages, err := g.SrcFs.ReadDir("docs/man")
+	g.CheckError(err, "reading source directory")
+	count := 0
+	g.Debug("Total of %d files in man directory", len(pages))
+	now := time.Now()
+	for _, page := range pages {
+		if page.IsDir() {
+			continue
+		}
+		if strings.HasSuffix(page.Name(), ".sect") {
+			g.LoadSection(strings.TrimSuffix(page.Name(), ".sect"))
+		}
+		if !strings.HasSuffix(page.Name(), ".adoc") {
+			continue
+		}
+		g.ProcessManPage(page)
+		count++
+	}
+	g.Debug("Processed %d pages in %v", count, time.Since(now))
+}
+
+func (g *Global) GenerateToC() {
+	toc := &strings.Builder{}
+	idx := &strings.Builder{}
+
+	for _, page := range g.Pages {
+		if sect := g.Sections[page.Section]; sect == nil {
+			g.Fatal("page %s section %s not found", page.Name, page.Section)
+		} else {
+			sect.Pages = append(sect.Pages, page)
+		}
+	}
+
+	var sects []string
+	for name, sect := range g.Sections {
+		sects = append(sects, name)
+		sort.Slice(sect.Pages, func(i, j int) bool { return sect.Pages[i].Name < sect.Pages[j].Name })
+	}
+	sort.Strings(sects)
+
+	// And also the index page.
+
+	// Emit the toc leader part
+	toc.WriteString("<nav id=\"toc\" class=\"toc2\">\n")
+	toc.WriteString("<div id=\"toctitle\">Table of Contents</div>\n")
+	toc.WriteString("<ul class=\"sectlevel1\n\">\n")
+
+	idx.WriteString("= NNG Reference Manual\n")
+
+	for _, sect := range sects {
+		s := g.Sections[sect]
+		_, _ = fmt.Fprintf(toc, "<li>%s</li>\n", s.Synopsis)
+		_, _ = fmt.Fprintf(toc, "<ul class=\"sectlevel2\">\n")
+
+		_, _ = fmt.Fprintf(idx, "\n== Section %s: %s\n\n", s.Name, s.Synopsis)
+		_, _ = fmt.Fprintln(idx, s.Description)
+		_, _ = fmt.Fprintln(idx, "\n[cols=\"3,5\"]\n|===")
+
+		for _, page := range s.Pages {
+			_, _ = fmt.Fprintf(toc, "<li><a href=\"%s.%s.html\">%s</a></li>\n",
+				page.Name, page.Section, page.Name)
+			_, _ = fmt.Fprintf(idx, "|xref:%s.%s.adoc[%s(%s)]\n", page.Name, page.Section,
+				page.Name, page.Section)
+			_, _ = fmt.Fprintf(idx, "|%s\n", page.Description)
+		}
+
+		_, _ = fmt.Fprintf(toc, "</ul>\n")
+		_, _ = fmt.Fprintln(idx, "|===")
+	}
+	_, _ = fmt.Fprintf(toc, "</ul>\n")
+	_, _ = fmt.Fprintf(toc, "</nav>\n")
+
+	index := &strings.Builder{}
+	_, _ = fmt.Fprintf(index, "---\n")
+	_, _ = fmt.Fprintf(index, "version: %s\n", g.Config.Version)
+	_, _ = fmt.Fprintf(index, "layout: %s\n", "manpage_v2")
+	_, _ = fmt.Fprintf(index, "---\n")
+	_, _ = fmt.Fprintf(index, "<h1>NNG Reference Manual</h1>\n")
+
+	cfg := g.LaConfig
+	cfg.Filename = "index.adoc"
+	_, err := libasciidoc.Convert(strings.NewReader(idx.String()), index, cfg)
+	g.CheckError(err, "formatting index")
+	g.Index = index.String()
+	g.ToC = toc.String()
+}
+
+func (g *Global) CreateBranch() {
+	brName := uuid.New().String()
+	var err error
+
+	refName := plumbing.ReferenceName("refs/heads/" + brName)
+	g.Branch = brName
+
+	g.WorkTree, err = g.Repo.Worktree()
+	g.CheckError(err, "getting worktree")
+
+	err = g.WorkTree.Checkout(&git.CheckoutOptions{
+		Branch: refName,
+		Create: true,
+	})
+	g.CheckError(err, "creating branch")
+	g.Print("Checked out branch %v", brName)
+	pr, err := g.Repo.Head()
+	g.CheckError(err, "getting head hash")
+	g.OldHash = pr.Hash()
+}
+
+func (g *Global) WriteFile(name string, content string) {
+	full := path.Join(g.DstDir, name)
+	f, err := g.DstFs.Create(full)
+	g.CheckError(err, "creating file %s", name)
+	_, err = f.Write([]byte(content))
+	g.CheckError(err, "writing file %s", name)
+	err = f.Close()
+	g.CheckError(err, "closing file %s", name)
+	g.Add(name)
+}
+
+func (g *Global) Add(name string) {
+	g.Log.TRACE.Printf("Adding file %s", name)
+	g.Added[name] = true
+}
+
+func (g *Global) Delete(name string) {
+	g.Debug("Removing file %s", name)
+	_, err := g.WorkTree.Remove(path.Join(g.DstDir, name))
+	g.CheckError(err, "removing file %s", name)
+}
+
+func (g *Global) Commit() {
+	if status, err := g.WorkTree.Status(); status == nil {
+		g.CheckError(err, "obtaining status")
+	} else if status.IsClean() {
+		g.Print("No changes to commit.")
+		return
+	}
+	message := g.Config.Message
+	if message == "" {
+		message = "Manual page updates for " + g.Config.Version
+	}
+	var err error
+	g.NewHash, err = g.WorkTree.Commit(message, &git.CommitOptions{
+		Author: &object.Signature{
+			Email: g.Config.Email,
+			Name:  g.Config.Author,
+			When:  time.Now(),
+		},
+	})
+	g.CheckError(err, "committing branch")
+}
+
+func (g *Global) Push() {
+	if g.NewHash.IsZero() {
+		g.Print("Nothing to push.")
+		return
+	}
+
+	ci, err := g.Repo.Log(&git.LogOptions{
+		From: g.NewHash,
+	})
+	g.CheckError(err, "getting commit log")
+	commit, err := ci.Next()
+	g.CheckError(err,"getting single commit")
+	if commit != nil {
+		g.Print(commit.String())
+		if fs, _ := commit.Stats(); fs != nil {
+			g.Debug(fs.String())
+		}
+	}
+	if g.Config.DryRun {
+		g.Print("Not pushing changes (dry-run mode.)")
+	} else {
+		err := g.Repo.Push(&git.PushOptions{
+			RemoteName: "origin",
+		})
+		g.CheckError(err, "pushing changes")
+		g.Print("Pushed branch %v\n", g.Branch)
+	}
+}
+
+func (g *Global) WriteOutput() {
+
+	for _, p := range g.Pages {
+		fName := fmt.Sprintf("%s.%s.html", p.Name, p.Section)
+		g.WriteFile(fName, p.Content)
+	}
+	g.WriteFile("_toc.html", g.ToC)
+	g.WriteFile("index.html", g.Index)
+
+	_, err := g.WorkTree.Add(g.DstDir)
+	g.CheckError(err, "adding directory")
+	files, err := g.DstFs.ReadDir(g.DstDir)
+	g.CheckError(err, "scanning destination directory")
+	for _, file := range files {
+		if file.IsDir() {
+			continue
+		}
+		if g.Added[file.Name()] {
+			continue
+		}
+		g.Delete(file.Name())
+	}
+	status, err := g.WorkTree.Status()
+	g.CheckError(err, "obtaining commit status")
+	if !status.IsClean() {
+		g.Debug("No changes.")
+	} else {
+		g.Debug(status.String())
+	}
+}
+
+func main() {
+	g := &Global{}
+	flag.Parse()
+	g.Init()
+	defer g.Destroy()
+
+	g.CloneSource()
+	g.ClonePages()
+	g.ProcessSource()
+	g.GenerateToC()
+	g.CreateBranch()
+	g.WriteOutput()
+	g.Commit()
+	g.Push()
+}