feat(ui/chat): add open keybind to bottom tooltip bar and add CLAUDE.md

Show 'o open' in the short help bar when selected message has
attachments or URLs. Add project context file for Claude Code.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,73 @@
+# Project Context
+
+## What This File Is
+This is the persistent context file for Claude Code. Keep it concise and useful.
+
+## CLAUDE.md Maintenance Rules
+- Keep this file under 160 lines
+- Only record decisions, not explanations of common knowledge
+- When adding something, check if anything existing is now outdated and remove it
+- Use short bullet points, not paragraphs
+- No boilerplate or filler text
+- If a section grows past 10 items, consolidate or prune the least relevant ones
+- Format: what we chose + why in one line (e.g., "imv over feh — WebP/Wayland support")
+
+## Overview
+- Fork of [ayn2op/discordo](https://github.com/ayn2op/discordo) — a Discord TUI client
+- Upstream: `https://github.com/ayn2op/discordo.git`
+- Our repo: `https://gogs.altsol.dev/claude/discordo-plus.git` (branch: `master`)
+- Binary name: `discordo-plus` (installed to `/usr/local/bin/`)
+
+## Stack
+- Go (module: `github.com/ayn2op/discordo`)
+- TUI: `github.com/ayn2op/tview` (custom tview fork) + `tcell/v3`
+- Discord API: `arikawa/v3` + `ningen/v3` (state management + Discord markdown)
+- Markdown: `goldmark` parser + `chroma/v2` syntax highlighting
+- Config: TOML via `BurntSushi/toml`, file at `~/.config/discordo/config.toml`
+- Cache: `~/.cache/discordo/` (attachments, logs)
+
+## Architecture
+- `main.go` → `cmd/root.go` (app init) → `internal/ui/` (TUI layers)
+- `internal/ui/chat/` — core chat UI: `messages_list.go` (1500+ lines, message rendering/keybinds), `message_input.go`, `guilds_tree.go`, `attachments_picker.go`
+- `internal/markdown/renderer.go` — AST→styled lines, handles Discord markdown flavors
+- `internal/config/` — `config.go` (struct + loader), `config.toml` (defaults, embedded), `keybinds.go`, `theme.go`
+- `internal/consts/` — app name, cache dir
+- Rendering pipeline: messages → `tview.LineBuilder` → `[]tview.Line` (segments with `tcell.Style`)
+- URLs get `style.Url(rawURL)` metadata for OSC 8 terminal hyperlinks
+- External commands (editor, image viewer) use `app.Suspend()` pattern — suspends TUI, runs command, resumes
+
+## Key Patterns
+- Keybinds: defined in `config/keybinds.go` structs, matched in `HandleEvent()` via `keybind.Matches()`
+- Help tooltips: `ShortHelp()` (bottom bar, contextual) and `FullHelp()` (full overlay via ctrl+.)
+- Attachments: downloaded to `~/.cache/discordo/attachments/`, opened via configured viewer or `open.Start()`
+- Embeds: rendered with `▎` bar prefix, wrapped to viewport width, markdown in descriptions
+- Config defaults embedded via `//go:embed config.toml`
+
+## Our Changes (vs upstream)
+- **Image viewer**: `image_viewer` config (default: `imv`) — opens image attachments in configured viewer with TUI suspend/resume instead of browser
+- **Save image**: `save_image` keybind (`S`) — saves image attachment to `image_save_dir`
+- **Attachment URL fix**: split `builder.Write(filename+"\n"+url)` into proper `NewLine()` + `.Url()` style
+- **Supported image types**: jpeg, png, webp, gif (via `supportedImageTypes` map)
+- **ShortHelp**: `o` (open) now shows in bottom tooltip bar when message has attachments/URLs
+
+## Config Fields We Added
+- `image_viewer` — external image viewer command (default: `"imv"`, `"default"` = system opener)
+- `image_save_dir` — directory for saved images (supports `~/`, default: current dir)
+- `keybinds.messages_list.save_image` — save image keybind (default: `S`)
+
+## Build & Run
+- Build: `go build -o discordo-plus .`
+- Install: `sudo mv discordo-plus /usr/local/bin/`
+- Run: `discordo-plus`
+- Test: `go test ./...` (only config + keyring packages have tests)
+- Dependencies: `imv` (or configured image viewer)
+
+## Git
+- Identity: `claude <claude@altsol.dev>`
+- Commit style: `type(scope): description` (e.g., `feat(ui/chat): add image viewer`)
+- Branch: `master`
+
+## Known Issues
+- Discord ToS discourages third-party clients — use at own risk
+- `imv` package on some distros installs as `imv-x11`/`imv-wayland` without an `imv` symlink
+- WebP support depends on the configured viewer (imv supports it, feh may not)

internal/ui/chat/messages_list.go

@@ -1503,6 +1503,9 @@ func (ml *messagesList) ShortHelp() []keybind.Keybind {
 		if msg.Author.ID != me.ID {
 			help = append(help, cfg.Reply.Keybind)
 		}
+		if len(messageURLs(*msg)) != 0 || len(msg.Attachments) != 0 {
+			help = append(help, cfg.Open.Keybind)
+		}
 	}
 
 	return help