Ctx2img

ctx2img — Repository Atlas

ctx2img compiles the repository into a query-conditioned map: an image where position = module topology, cell area = code size, elevation (▲1–▲5) = relevance to your current task, hatched red = trust hazards, arrows = dependencies. Every region/file/symbol carries a stable handle (R3, F103, S12) that resolves back to exact source. The image is an index, never the source of truth — exact code always comes from ctx2img read as text.

Workflow

1. Index the repo against your task (auto-builds on first run):

   ctx2img paint . --budget 2000 -q "<one line describing your task>"
   

   stdout is the legend (region roster with handles + elevation). If it prints an # atlas: <path> line, Read that PNG file now — the image carries the geography the legend can't. On small repos it may print a text-only roster instead (representation: text) — that alone is a complete map; no image to read.

2. Pick the summit. Start from the highest-elevation regions (▲5/▲4) and their top files. ⚠net/exec/secrets/eval tags mark files that touch the outside world — relevant for anything security-adjacent.

3. Focus where the task points — paint just that module or file:

   ctx2img paint src/auth -q "<task>"   # one module's FULL SOURCE as image tiles
   ctx2img paint src/auth/session.rs    # a single file as dense pages
   

   Subdirectory paints share the whole repo's handles and relevance, so the tiles line up with the atlas you already saw.

4. Get exact source as text (never trust pixels for code):

   ctx2img read F103                  # whole file, numbered
   ctx2img read S12                   # just that symbol's line range
   ctx2img read F103 --lines 40:120
   ctx2img read --find "session"      # search paths+symbols, answers in handles
   

5. Compress any bulky text (a long doc, tool output, a spec — or a whole directory) before ingesting it:

   ctx2img paint doc.md --out-dir /tmp/pages     # markdown → section map (headings = territories)
   ctx2img paint some/dir --query "<task>"       # dir → atlas folio: overview + full-source tiles
   cat text | ctx2img paint --out-dir /tmp/pages # flat text → dense pages
   

   Then Read the page PNGs in order. Keep the printed factsheet line — it carries the exact identifiers (paths, SHAs, IDs) as text; quote those from the factsheet, never by transcribing them from the image. If paint says text is cheaper, just read the text.

Rules

• The atlas is for navigation; inscribe tiles and paint pages are for reading. Quote, edit, hash-compare, and reason over ctx2img read output or the factsheet (text), never over strings you transcribed from an image — image misreads are silent and look plausible.
• Handles are stable across runs and queries — safe to mention in commits, notes, and follow-up commands.
• Re-run ctx2img paint . --budget 2000 -q "<new task>" whenever your task changes; it re-elevates the same geography in well under a second (warm cache), so map early and often.
• --json on paint gives {pages, legend_path, ...} when you need to script it.
• For a human-facing map (README, PR description): ctx2img paint . --theme parchment.