shawn-sandy/share-github

share-github

Fetch a specific file or snippet from a public GitHub repository, security-scrub it, draft platform-aware copy, and generate a syntax-highlighted dark-mode card image.

Public repositories only. A 4xx from the raw URL means the repo is private or the path is wrong — stop with a clear error.

Quick Reference

| Phase | Action | |-------|--------| | 0 — Locate | Locate templates/ and derive PLUGIN_DIR | | 1 — Parse URL | Extract owner/repo/branch/path + parse #L fragment before any WebFetch | | 1c — Reuse check | Scan docs/media/social/ for existing snippet posts; offer reuse | | 2 — Fetch Raw Code | WebFetch raw URL; extract line range; cap at 80 lines | | 3 — Security Scrub | Write to temp file; call security-scrub skill with explicit args | | 4 — Draft Copy | Write platform-aware copy | | 5 — Populate Template | HTML-escape code; fill snippet-card.html; save to docs/media/social/ | | 6 — Deliver | Copy in fenced block + PNG card + saved path |

Exit plan mode

ExitPlanMode is a deferred tool whose schema must be loaded before it can be called. Use ToolSearch with select:ExitPlanMode first, then call ExitPlanMode. Both steps happen silently with no user-visible output.

Error handling: If ExitPlanMode returns the exact error "You are not in plan mode", treat that as success — plan mode was already off. Do not abort or surface the error to the user; continue to the next step.

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Phase 0 — Locate Plugin Assets

Run silently:

[ -n "${CLAUDE_PLUGIN_ROOT}" ] && [ -d "${CLAUDE_PLUGIN_ROOT}/templates" ] && \
  echo "${CLAUDE_PLUGIN_ROOT}/templates"
find ~/.claude/plugins -path "*/social-media-tools/templates" -type d 2>/dev/null | head -1
find ~/.claude -path "*/social-media-tools/templates" -type d 2>/dev/null | head -1

Use the first non-empty result as TEMPLATES_DIR. Derive:

PLUGIN_DIR=$(dirname "$TEMPLATES_DIR")

If not found: output "Templates not found. Install the plugin or load it with --plugin-dir." and STOP.

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Phase 1 — Parse GitHub URL

Accepted URL forms

• https://github.com/{owner}/{repo}/blob/{branch}/{path} — standard file view
• https://raw.githubusercontent.com/{owner}/{repo}/{branch}/{path} — raw URL

Parse the URL fragment FIRST — before any WebFetch call

1. If the URL contains #L: split on #, parse the right side:
   • L10 → LINE_START=10, LINE_END=10
   • L10-L25 → LINE_START=10, LINE_END=25
2. Strip the #... fragment from the URL — do not include it in any subsequent step.

Extract URL components

• OWNER, REPO, BRANCH, FILE_PATH
• FILENAME = basename of FILE_PATH
• REPO_SLUG = OWNER/REPO
• LANGUAGE and LANGUAGE_COLOR from file extension — look up in $PLUGIN_DIR/references/language-map.md
• HLJS_CLASS = lowercase language alias (e.g., typescript, python; C# → csharp; C++ → cpp; Shell → bash)

Use AskUserQuestion to collect:

• PLATFORM — see Platform Options in $PLUGIN_DIR/references/platforms.md
• HOOK_ANGLE (optional)

---

Phase 1c — Reuse Check

FILE_PREFIX=snippet

Read $PLUGIN_DIR/references/reuse-check.md and follow its procedure.

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Phase 2 — Fetch Raw Code

Deferred tool bootstrap

Use ToolSearch with select:WebFetch first (silent, no user output), then call WebFetch.

• If input was github.com/.../blob/...: convert to raw URL: https://raw.githubusercontent.com/{OWNER}/{REPO}/{BRANCH}/{FILE_PATH}
• If input was raw.githubusercontent.com/...: use as-is.

Call WebFetch on the raw URL. Store the response body as RAW_CONTENT.

4xx response:

"This repository may be private or the file path is incorrect. This skill only supports public repositories." Then STOP.

Extract lines from RAW_CONTENT: if LINE_START/LINE_END set, use those (1-indexed); otherwise use lines 1–80.

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Phase 3 — Security Scrub

Write the extracted snippet to a temp file:

Write to: ~/.claude/tmp/scrub-input.txt
Content: the extracted code snippet (plain text, no HTML escaping yet)

Then invoke:

Skill(skill: "social-media-tools:security-scrub", args: "Scan the file at ~/.claude/tmp/scrub-input.txt for secrets before sharing.")

Check the returned GATE RESULT line (the gate runs inside security-scrub):

• GATE RESULT: BLOCKED or GATE RESULT: CANCELLED → STOP. Do not proceed to Phase 4.
• GATE RESULT: APPROVED → proceed to Phase 4.
• Missing or unrecognized GATE RESULT → STOP and report an error (treat as gate failure).

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Phase 4 — Draft Copy

Read $PLUGIN_DIR/references/platforms.md for character limits, the Follow CTA rule, Default Per-Platform Copy Formats, and Draft Copy — Standard Procedure.

Content-specific guidance for this skill:

• LinkedIn: Context ("Here's [LANGUAGE] code from [OWNER/REPO] that...") + what it does + key design decision or insight + CTA with link
• Twitter/X: "[LANGUAGE] snippet worth seeing → [what it does in one phrase] — [GitHub URL]"
• Bluesky: Similar brevity to Twitter; name the repo
• Substack: Why you found this code interesting + what it demonstrates + link

Read the code snippet before drafting.

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Phase 5 — Populate Template

HTML-escape the code — MANDATORY

Apply in this exact order:

1. & → & ← must be first (prevents double-escaping)
2. < → <
3. > → >
4. " → "

Store the result as CODE_LINES_ESCAPED.

Substitute variables

For variable reference, read $PLUGIN_DIR/references/variables.md.

| Template variable | Value | |-------------------|-------| | {{FILENAME}} | FILENAME (HTML-escaped) | | {{LANGUAGE}} | HLJS_CLASS (lowercase alias, e.g. typescript) | | {{LANGUAGE_COLOR}} | LANGUAGE_COLOR hex (from $PLUGIN_DIR/references/language-map.md only) | | {{CODE_LINES}} | CODE_LINES_ESCAPED | | {{LINE_RANGE}} | e.g., "L10–L25" or "lines 1–80" | | {{REPO_SLUG}} | "OWNER/REPO" (HTML-escaped) | | {{GITHUB_URL}} | Fragment-stripped original URL |

COPY_PANELS

Read $PLUGIN_DIR/references/copy-panels.md for markup and escaping rules.

Write the populated HTML to ~/.claude/tmp/share-github-card.html:

mkdir -p ~/.claude/tmp
TEMP_HTML=share-github-card.html
FILE_PREFIX=snippet
SLUG_INPUT=$FILENAME

Persistent Save

Read $PLUGIN_DIR/references/saving-and-delivery.md — Persistent Save section.

Screenshot

Read $PLUGIN_DIR/references/rendering-pipeline.md and follow the full pipeline.

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Phase 6 — Deliver

Read $PLUGIN_DIR/references/saving-and-delivery.md — Deliver section.