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amvcp-iterm2-preview

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Mis à jour25 mai 2026 à 00:59

Preview an HTML page or render a Mermaid diagram as SVG inside an iTerm2 vertical split-pane (Web Browser profile) right next to the terminal. Aborts cleanly on any non-iTerm2 host (Claude Desktop, Terminal.app, VS Code, tmux, SSH, web shells). Use when the user wants to preview an HTML file or see a Mermaid diagram rendered without leaving the terminal. Trigger with 'show me a preview', 'preview the HTML', 'render this as SVG'.

Installation

Installer avec Codex ou Claude Copiez ce prompt, collez-le dans Codex, Claude ou un autre assistant, puis laissez-le vérifier la page du skill et l'installer pour vous.

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Source

Emasoft

Emasoft/ai-maestro-visual-communicator-plugin

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Métiers associésSOC

Basé sur la classification professionnelle SOC

Développeurs de logicielsProfessions informatiques et mathématiques·SOC 15-1252

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SKILL.md

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name	amvcp-iterm2-preview
description	Preview an HTML page or render a Mermaid diagram as SVG inside an iTerm2 vertical split-pane (Web Browser profile) right next to the terminal. Aborts cleanly on any non-iTerm2 host (Claude Desktop, Terminal.app, VS Code, tmux, SSH, web shells). Use when the user wants to preview an HTML file or see a Mermaid diagram rendered without leaving the terminal. Trigger with 'show me a preview', 'preview the HTML', 'render this as SVG'.
license	MIT
compatibility	macOS only. Real iTerm2.app + 'Web Browser' profile required. Mermaid mode also needs `mmdc`.
metadata	{"author":"Emasoft"}

iTerm2 Preview

Overview

Splits the current iTerm2 tab vertically and opens an HTML/SVG file in the right-hand pane via a "Web Browser" profile. Refuses on every non-iTerm2 host (Claude Desktop, Terminal.app, WezTerm/Alacritty/Kitty, VS Code, Cursor, tmux/screen, SSH, Codespaces/Gitpod/Replit/Jupyter/xterm.js) — Step 0 aborts cleanly.

Auto-invoked by scripts/amvcp-select.py: opens generated pages in a split-pane instead of Chrome on iTerm2; otherwise existing browser flow runs unchanged. Opt-out via VE_SELECT_NO_ITERM=1.

Prerequisites

macOS with iTerm2.app installed and currently running.
iTerm2 profile named exactly "Web Browser" (Preferences → Profiles → "+" → set as browser session).
osascript available (default on macOS).
For Mermaid mode: mmdc (npm i -g @mermaid-js/mermaid-cli).
NOT inside tmux/screen, SSH, VS Code, Cursor, or a web-hosted shell.

Instructions

Step 0 — verify host is real iTerm2. ALWAYS run before any AppleScript:
```
uv run "$CLAUDE_PLUGIN_ROOT/skills/amvcp-iterm2-preview/scripts/detect_iterm2.py"
```
On non-zero exit, abort with the stderr message verbatim. Do NOT bypass.
Locate the file. HTML: use the user's path or find . -name "*.html" | head. Mermaid: see cookbook for the mmdc + svg_to_html.py wrap chain.
Open the split-pane: osascript ".../scripts/open_preview.applescript" "<url>" where <url> is complete (file://<abs-path> or http://localhost:<port>/...).
Tell the user how to close: "Preview open in the right pane. Close with osascript .../scripts/close_preview.applescript or exit inside that pane."

Output

Vertical split-pane in the current iTerm2 tab, right ~50%, "Web Browser" profile pointing at the URL. Terminal session preserved on the left. Mermaid mode writes to /tmp.

Side effects: disables iTerm2 pane dimming globally + names the preview pane "amvcp Preview" + tints its tab color bright gray (#D0D0D0) for visual distinction. Enable Settings → Profiles → Web Browser → "Show Title Bar" to see both cues. See cookbook for details.

Error Handling

Symptom	Fix
`NOT-iTerm2: …` from Step 0	stderr names which check failed. Do NOT bypass.
`"Web Browser" profile not found`	Create in Preferences → Profiles → "+".
`mmdc: command not found`	`npm i -g @mermaid-js/mermaid-cli`.
Pane blank	URL must be complete; use `$(realpath ...)` for files.
Wrong window	AppleScript uses `current window`; bring target to front.

Examples

Input: "show me the landing page".

$ uv run ".../detect_iterm2.py"
iTerm2 verified: TERM_PROGRAM=iTerm.app, LC_TERMINAL=iTerm2, …
$ osascript ".../open_preview.applescript" "file://$(realpath ./index.html)"

Output: "Preview open in the right pane. Close with the close_preview.applescript when done."

Negative example: Codespaces. Step 0 returns NOT-iTerm2: web/cloud terminal detected: GitHub Codespaces ($CODESPACES is set). Abort; suggest /amvcp-share-page instead.

Modes

Not applicable — this skill is a terminal/iTerm pane lifecycle helper, not a render skill. It does NOT emit DOM or carry a data-ve-mode attribute (R20-R23 of amvcp-self-debug-rules don't apply).

Composability

Not applicable in the visual sense — iTerm pane management is orthogonal to the visual rendering skills. Multiple amvcp-iterm2-preview invocations from the same shell are guarded by the safeguard in open_preview.applescript (R7).

Resources

iterm2-preview-cookbook.md — detector internals, Mermaid workflow, abort cases.

Why detect iTerm2 first · Detector internals · Mode 1 — HTML preview workflow · Mode 2 — Mermaid → SVG workflow · Worked examples · Closing the preview · Side effects of opening a preview · Page navigation — Python API + keystroke fallback · Recommended one-time profile setup · Why focused/unfocused title bars sometimes look the same · close_preview.applescript safety
- Why detect iTerm2 first
- Detector internals
- Mode 1 — HTML preview workflow
- Mode 2 — Mermaid → SVG workflow
- Worked examples
- Closing the preview

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name	amvcp-iterm2-preview
description	Preview an HTML page or render a Mermaid diagram as SVG inside an iTerm2 vertical split-pane (Web Browser profile) right next to the terminal. Aborts cleanly on any non-iTerm2 host (Claude Desktop, Terminal.app, VS Code, tmux, SSH, web shells). Use when the user wants to preview an HTML file or see a Mermaid diagram rendered without leaving the terminal. Trigger with 'show me a preview', 'preview the HTML', 'render this as SVG'.
license	MIT
compatibility	macOS only. Real iTerm2.app + 'Web Browser' profile required. Mermaid mode also needs `mmdc`.
metadata	{"author":"Emasoft"}

iTerm2 Preview

Overview

Auto-invoked by scripts/amvcp-select.py: opens generated pages in a split-pane instead of Chrome on iTerm2; otherwise existing browser flow runs unchanged. Opt-out via VE_SELECT_NO_ITERM=1.

Prerequisites

macOS with iTerm2.app installed and currently running.
iTerm2 profile named exactly "Web Browser" (Preferences → Profiles → "+" → set as browser session).
osascript available (default on macOS).
For Mermaid mode: mmdc (npm i -g @mermaid-js/mermaid-cli).
NOT inside tmux/screen, SSH, VS Code, Cursor, or a web-hosted shell.

Instructions

Step 0 — verify host is real iTerm2. ALWAYS run before any AppleScript:
```
uv run "$CLAUDE_PLUGIN_ROOT/skills/amvcp-iterm2-preview/scripts/detect_iterm2.py"
```
On non-zero exit, abort with the stderr message verbatim. Do NOT bypass.
Locate the file. HTML: use the user's path or find . -name "*.html" | head. Mermaid: see cookbook for the mmdc + svg_to_html.py wrap chain.
Open the split-pane: osascript ".../scripts/open_preview.applescript" "<url>" where <url> is complete (file://<abs-path> or http://localhost:<port>/...).
Tell the user how to close: "Preview open in the right pane. Close with osascript .../scripts/close_preview.applescript or exit inside that pane."

Output

Vertical split-pane in the current iTerm2 tab, right ~50%, "Web Browser" profile pointing at the URL. Terminal session preserved on the left. Mermaid mode writes to /tmp.

Error Handling

Symptom	Fix
`NOT-iTerm2: …` from Step 0	stderr names which check failed. Do NOT bypass.
`"Web Browser" profile not found`	Create in Preferences → Profiles → "+".
`mmdc: command not found`	`npm i -g @mermaid-js/mermaid-cli`.
Pane blank	URL must be complete; use `$(realpath ...)` for files.
Wrong window	AppleScript uses `current window`; bring target to front.

Examples

Input: "show me the landing page".

$ uv run ".../detect_iterm2.py"
iTerm2 verified: TERM_PROGRAM=iTerm.app, LC_TERMINAL=iTerm2, …
$ osascript ".../open_preview.applescript" "file://$(realpath ./index.html)"

Output: "Preview open in the right pane. Close with the close_preview.applescript when done."

Negative example: Codespaces. Step 0 returns NOT-iTerm2: web/cloud terminal detected: GitHub Codespaces ($CODESPACES is set). Abort; suggest /amvcp-share-page instead.

Modes

Composability

Resources

iterm2-preview-cookbook.md — detector internals, Mermaid workflow, abort cases.

Why detect iTerm2 first · Detector internals · Mode 1 — HTML preview workflow · Mode 2 — Mermaid → SVG workflow · Worked examples · Closing the preview · Side effects of opening a preview · Page navigation — Python API + keystroke fallback · Recommended one-time profile setup · Why focused/unfocused title bars sometimes look the same · close_preview.applescript safety
- Why detect iTerm2 first
- Detector internals
- Mode 1 — HTML preview workflow
- Mode 2 — Mermaid → SVG workflow
- Worked examples
- Closing the preview