copy github pr or issue link to slack

gh-slack.sh

#!/bin/bash

# gh-slack: Generate Slack-formatted links from GitHub PR/issue URLs
# Usage: gh-slack <github-url>

set -e

# Escape special characters for Slack mrkdwn
escape_slack() {
  local s="$1"
  s="${s//&/&amp;}"
  s="${s//</&lt;}"
  s="${s//>/&gt;}"
  echo "$s"
}

# State to emoji mapping
state_emoji() {
  local state="$1"

  case "$state" in
    draft)
      echo ":pr-draft:"
      ;;
    merged)
      echo ":merge:"
      ;;
    closed)
      echo ":closed:"
      ;;
    open|*)
      echo ":pr:"
      ;;
  esac
}

# Parse GitHub URL to extract owner, repo, type (pull/issues), and number
parse_github_url() {
  local url="$1"

  # Remove trailing slash if present
  url="${url%/}"

  # Match patterns like:
  # https://github.com/owner/repo/pull/123
  # https://github.com/owner/repo/issues/123
  if [[ "$url" =~ github\.com/([^/]+)/([^/]+)/(pull|issues)/([0-9]+) ]]; then
    OWNER="${BASH_REMATCH[1]}"
    REPO="${BASH_REMATCH[2]}"
    TYPE="${BASH_REMATCH[3]}"
    NUMBER="${BASH_REMATCH[4]}"
    return 0
  fi

  return 1
}

# Fetch PR info using gh CLI (returns tab-separated: title, state, isDraft)
fetch_pr_info() {
  local owner="$1"
  local repo="$2"
  local number="$3"

  gh pr view "$number" --repo "$owner/$repo" --json title,state,isDraft --jq '[.title, .state, .isDraft] | @tsv' 2>/dev/null
}

# Fetch issue info using gh CLI (returns tab-separated: title, state)
fetch_issue_info() {
  local owner="$1"
  local repo="$2"
  local number="$3"

  gh issue view "$number" --repo "$owner/$repo" --json title,state --jq '[.title, .state] | @tsv' 2>/dev/null
}

# Main function
main() {
  local url="$1"

  if [[ -z "$url" ]]; then
    echo "Usage: gh-slack <github-pr-or-issue-url>" >&2
    echo "" >&2
    echo "Examples:" >&2
    echo "  gh-slack https://github.com/owner/repo/pull/123" >&2
    echo "  gh-slack https://github.com/owner/repo/issues/456" >&2
    exit 1
  fi

  # Check if gh CLI is available
  if ! command -v gh &> /dev/null; then
    echo "Error: gh CLI is not installed. Please install it first:" >&2
    echo "  brew install gh" >&2
    exit 1
  fi

  # Parse the URL
  if ! parse_github_url "$url"; then
    echo "Error: Invalid GitHub URL. Expected format:" >&2
    echo "  https://github.com/owner/repo/pull/123" >&2
    echo "  https://github.com/owner/repo/issues/123" >&2
    exit 1
  fi

  local title=""
  local state=""
  local emoji=""

  if [[ "$TYPE" == "pull" ]]; then
    # Fetch PR info (tab-separated: title, state, isDraft)
    local pr_info
    pr_info=$(fetch_pr_info "$OWNER" "$REPO" "$NUMBER")

    if [[ -z "$pr_info" ]]; then
      echo "Error: Could not fetch PR #$NUMBER from $OWNER/$REPO" >&2
      exit 1
    fi

    local pr_state is_draft
    IFS=$'\t' read -r title pr_state is_draft <<< "$pr_info"

    # Determine state
    if [[ "$is_draft" == "true" ]]; then
      state="draft"
    elif [[ "$pr_state" == "MERGED" ]]; then
      state="merged"
    elif [[ "$pr_state" == "CLOSED" ]]; then
      state="closed"
    else
      state="open"
    fi
  else
    # Fetch issue info (tab-separated: title, state)
    local issue_info
    issue_info=$(fetch_issue_info "$OWNER" "$REPO" "$NUMBER")

    if [[ -z "$issue_info" ]]; then
      echo "Error: Could not fetch issue #$NUMBER from $OWNER/$REPO" >&2
      exit 1
    fi

    local issue_state
    IFS=$'\t' read -r title issue_state <<< "$issue_info"

    if [[ "$issue_state" == "CLOSED" ]]; then
      state="closed"
    else
      state="open"
    fi
  fi

  # Get emoji for state
  emoji=$(state_emoji "$state")

  # Escape title for HTML
  local escaped_title
  escaped_title=$(escape_slack "$title")

  # Generate HTML link (for rich text clipboard)
  local html_link="$emoji <a href=\"$url\">$escaped_title</a>"
  # Generate plain text fallback
  local plain_link="$emoji $title — $url"

  # Output the plain version
  echo "$plain_link"

  # Try to copy rich text (HTML) to clipboard on macOS
  if [[ "$(uname)" == "Darwin" ]]; then
    # Use hexdump approach for reliable HTML clipboard on macOS
    local hex_html
    hex_html=$(echo -n "$html_link" | hexdump -ve '1/1 "%.2x"')

    osascript <<EOF
      set the clipboard to {«class HTML»:«data HTML${hex_html}», string:"${plain_link//\"/\\\"}"}
EOF
    if [[ $? -ne 0 ]]; then
      echo -n "$plain_link" | pbcopy
    fi
  elif command -v xclip &> /dev/null; then
    echo -n "$plain_link" | xclip -selection clipboard
  fi
}

main "$@"