Update README

Some reprioritization was in order.  Added some resources for hss.

README

@@ -185,6 +185,11 @@ An improved replacement for autocutsel in selection synchronization "mode":
 
 Only UTF8_STRING-convertible selections are synchronized.
 
+hasp -- (lib)asciidoc syntax preprocessor
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Provisional tool to make libasciidoc understand more syntax, namely two-line/
+underlined titles for my Gitea projects.
+
 ht -- terminal emulator
 ~~~~~~~~~~~~~~~~~~~~~~~
 Similar scope to st(1).  Clever display of internal padding for better looks.
@@ -204,6 +209,35 @@ https://godoc.org/github.com/gorilla/websocket
 The higher-level client-server API could be made rather generic to allow for
 smooth integration with non-IRC "backends" such as Slack or Mattermost.
 
+he -- text editor
+~~~~~~~~~~~~~~~~~
+VIM controls, no scripting, no syntax highlight, single-file, made for variable-
+-width/proportional fonts.  Initially done primarily to produce a text editing
+widget, which is going to be an interesting challenge, arguably better solved by
+whole program composition.  Scintilla may provide some inspiration.
+
+In the second stage, support for the Language Server Protocol will be added so
+that the project can be edited using its own tools.  Some scripting, perhaps
+a tiny subset of VimL, might be desirable.  Or other means of configuration.
+
+Visual block mode or the color column may still be implemented.
+
+The real model for the editor is Qt Creator with FakeVIM, though this is not to
+be a clone of it, e.g. the various "Output" lists could be just special buffers,
+which may be have names starting on "// ".
+
+Resources:
+ - http://doc.cat-v.org/plan_9/4th_edition/papers/sam/
+
+ho -- all-powerful organizer
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Zettelkasten with fulltext search, arbitrary reciprocal links, arbitrary tags.
+Flat storage.  Should be able to use translation dictionaries for search hints.
+
+Indexing and search may be based on a common database, no need to get all fancy:
+http://rachbelaid.com/postgres-full-text-search-is-good-enough/
+https://www.sqlite.org/fts3.html#full_text_index_queries (FTS4 seems better)
+
 htd -- translation dictionary
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 This specific kind of application doesn't need a lot of user interface either,
@@ -230,26 +264,6 @@ hiv -- image viewer
 JPG, PNG, first frame of GIF.  Zoom.  Going through adjacent files in directory
 using cursor keys.  Possibly a dialog with image metadata.
 
-he -- text editor
-~~~~~~~~~~~~~~~~~
-VIM controls, no scripting, no syntax highlight, single-file, made for variable-
--width/proportional fonts.  Initially done primarily to produce a text editing
-widget, which is going to be an interesting challenge, arguably better solved by
-whole program composition.  Scintilla may provide some inspiration.
-
-In the second stage, support for the Language Server Protocol will be added so
-that the project can be edited using its own tools.  Some scripting, perhaps
-a tiny subset of VimL, might be desirable.  Or other means of configuration.
-
-Visual block mode or the color column may still be implemented.
-
-The real model for the editor is Qt Creator with FakeVIM, though this is not to
-be a clone of it, e.g. the various "Output" lists could be just special buffers,
-which may be have names starting on "// ".
-
-Resources:
- - http://doc.cat-v.org/plan_9/4th_edition/papers/sam/
-
 hfm -- file manager
 ~~~~~~~~~~~~~~~~~~~
 All we need to achieve here is replace Midnight Commander, which besides the
@@ -263,14 +277,14 @@ Eventually the number of panels should be arbitrary with proper shortcuts for
 working with them.  We might also integrate a special view for picture previews,
 which might or might not deserve its own program.
 
-ho -- all-powerful organizer
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-Zettelkasten with fulltext search, arbitrary reciprocal links, arbitrary tags.
-Flat storage.  Should be able to use translation dictionaries for search hints.
+hss -- spreadsheets
+~~~~~~~~~~~~~~~~~~~
+The first version doesn't need to be able to reference other cells, and can more
+or less be a CSV editor.
 
-Indexing and search may be based on a common database, no need to get all fancy:
-http://rachbelaid.com/postgres-full-text-search-is-good-enough/
-https://www.sqlite.org/fts3.html#full_text_index_queries (FTS4 seems better)
+We can take inspiration from Excel:
+https://docs.microsoft.com/en-us/office/client-developer/excel/excel-recalculation
+https://www.microsoft.com/en-us/research/uploads/prod/2018/03/build-systems.pdf
 
 The rest
 ~~~~~~~~

hasp/main.go

@@ -0,0 +1,91 @@
+// Program hasp is a preprocessor for libasciidoc to make it understand
+// two-line/underlined titles, intended to be used in Gitea.
+package main
+
+import (
+	"bytes"
+	"context"
+	"encoding/xml"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+
+	"github.com/bytesparadise/libasciidoc"
+	"github.com/bytesparadise/libasciidoc/pkg/renderer"
+)
+
+// isTitle returns the title level if the lines seem to form a title,
+// zero otherwise. Input lines may inclide trailing newlines.
+func isTitle(line1, line2 []byte) int {
+	// This is a very naïve method, we should target graphemes (thus at least
+	// NFC normalize the lines first) and account for wide characters.
+	diff := utf8.RuneCount(line1) - utf8.RuneCount(line2)
+	if len(line2) < 2 || diff < -1 || diff > 1 {
+		return 0
+	}
+
+	// "Don't be fooled by back-to-back delimited blocks."
+	// Still gets fooled by other things, though.
+	if bytes.IndexFunc(line1, func(r rune) bool {
+		return unicode.IsLetter(r) || unicode.IsNumber(r)
+	}) < 0 {
+		return 0
+	}
+
+	// The underline must be homogenous.
+	for _, r := range bytes.TrimRight(line2, "\r\n") {
+		if r != line2[0] {
+			return 0
+		}
+	}
+	return 1 + strings.IndexByte("=-~^+", line2[0])
+}
+
+func writeLine(w *io.PipeWriter, cur, next []byte) []byte {
+	if level := isTitle(cur, next); level > 0 {
+		w.Write(append(bytes.Repeat([]byte{'='}, level), ' '))
+		next = nil
+	}
+	w.Write(cur)
+	return next
+}
+
+// ConvertTitles converts AsciiDoc two-line (underlined) titles to single-line.
+func ConvertTitles(w *io.PipeWriter, input []byte) {
+	var last []byte
+	for _, cur := range bytes.SplitAfter(input, []byte{'\n'}) {
+		last = writeLine(w, last, cur)
+	}
+	writeLine(w, last, nil)
+}
+
+func main() {
+	input, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+
+	pr, pw := io.Pipe()
+	go func() {
+		defer pw.Close()
+		ConvertTitles(pw, input)
+	}()
+
+	// io.Copy(os.Stdout, pr)
+	// return
+
+	_, err = libasciidoc.ConvertToHTML(context.Background(), pr, os.Stdout,
+		renderer.IncludeHeaderFooter(true))
+	if err != nil {
+		// Fallback: output all the text sanitized for direct inclusion.
+		os.Stdout.WriteString("<pre>")
+		for _, line := range bytes.Split(input, []byte{'\n'}) {
+			xml.EscapeText(os.Stdout, line)
+			os.Stdout.WriteString("\n")
+		}
+		os.Stdout.WriteString("</pre>")
+	}
+}