mrcharles
10e930e46d
Go CLI that turns the markdown currency of this stack (Redmine notes, Discourse posts, briefing output) into typeset PDFs: two embedded typst templates (report with title page/TOC/headers, dense brief), front-matter (title/subtitle/author/date/classification/template), GFM tables, and bar charts rendered in pure Go (go-chart) from fenced chart data blocks. Engine is a prebuilt typst 0.15.1 container pinned by digest and run --network none; PDF bytes to stdout or -o. Exit codes 0/1/2. All dev in docker (dev.sh/Makefile); unit tests + golden typst fixtures plus a host-side smoke against the real engine container. Generated with Crush Assisted-by: Crush:glm-5.2
39 lines
1.2 KiB
Go
39 lines
1.2 KiB
Go
// Package pdfinfo extracts basic facts from PDF bytes with a tiny parser —
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// no third-party PDF library, just enough to count pages in golden tests
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// and smoke checks.
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package pdfinfo
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import (
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"bytes"
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"fmt"
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"regexp"
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"strconv"
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)
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// Pages returns the page count of a PDF by scanning for the /Type /Pages
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// objects' /Count entries (the catalog root carries the total; we take the
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// maximum to be safe with nested page trees).
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func Pages(pdf []byte) (int, error) {
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if len(pdf) == 0 || !bytes.HasPrefix(pdf, []byte("%PDF-")) {
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return 0, fmt.Errorf("pdfinfo: not a PDF (missing %%%%PDF- header)")
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}
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re := regexp.MustCompile(`/Type\s*/Pages[^>]*?/Count\s+(\d+)`)
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best := 0
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for _, m := range re.FindAllStringSubmatch(string(pdf), -1) {
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if n, err := strconv.Atoi(m[1]); err == nil && n > best {
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best = n
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}
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}
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if best == 0 {
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// Compressed object streams can hide the count; require at least
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// the header then fall back to /Type /Page occurrences (\b keeps
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// /Pages from matching).
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pageRe := regexp.MustCompile(`/Type\s*/Page\b`)
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best = len(pageRe.FindAll(pdf, -1))
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if best == 0 {
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return 0, fmt.Errorf("pdfinfo: no page count found")
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}
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}
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return best, nil
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}
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