| 1 | #!/bin/sh |
| 2 | # SessionStart hook for the diffinery plugin (Claude Code and Codex). |
| 3 | # |
| 4 | # When the session's working directory is a git repository with a remote on a Diffinery instance, |
| 5 | # prints JSON that adds a short note to the agent's context: where the repository is hosted, |
| 6 | # whether the diffinery CLI is installed and signed in there, and that it is preferred over gh. |
| 7 | # Elsewhere it prints nothing. It never touches the network and always exits 0. |
| 8 | # |
| 9 | # The instances it knows, in this order: DIFFINERY_URL, the plugin's Diffinery URL setting |
| 10 | # (CLAUDE_PLUGIN_OPTION_URL, Claude Code only), the URL `diffinery login` saved, and diffinery.com. |
| 11 | |
| 12 | # The origin of a URL as scheme://host[:port], lower-cased; nothing unless it is plain http(s) with a |
| 13 | # host of letters, digits, dots and dashes, so it is safe to put in a pattern and in JSON. |
| 14 | origin_of() { |
| 15 | printf '%s\n' "$1" | tr 'A-Z' 'a-z' | |
| 16 | sed -n -E 's#^[[:space:]]*(https?://)?([a-z0-9]([a-z0-9.-]*[a-z0-9])?)(:[0-9]{1,5})?(/.*)?[[:space:]]*$#\1\2\4#p' | |
| 17 | sed '/:\/\//!s#^#https://#' | head -n 1 |
| 18 | } |
| 19 | |
| 20 | main() { |
| 21 | dir=${CLAUDE_PROJECT_DIR:-$PWD} |
| 22 | command -v git >/dev/null 2>&1 || return 0 |
| 23 | |
| 24 | case ${XDG_CONFIG_HOME:-} in |
| 25 | /*) cfg=$XDG_CONFIG_HOME/diffinery/config.json ;; |
| 26 | *) cfg=$HOME/.config/diffinery/config.json ;; |
| 27 | esac |
| 28 | saved= |
| 29 | [ -f "$cfg" ] && saved=$(sed -n 's/.*"url"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' "$cfg" 2>/dev/null | head -n 1) |
| 30 | |
| 31 | # origin first, then any other remote. |
| 32 | remotes=$( |
| 33 | { |
| 34 | git -C "$dir" remote get-url origin |
| 35 | git -C "$dir" config --get-regexp '^remote\..*\.url$' | sed 's/^[^ ]* //' |
| 36 | } 2>/dev/null |
| 37 | ) |
| 38 | [ -n "$remotes" ] || return 0 |
| 39 | |
| 40 | # Only the instance's host itself counts (not lookalike hosts), and owner/repo are limited to |
| 41 | # characters that are safe to put in JSON. |
| 42 | slug= base= |
| 43 | for u in "${DIFFINERY_URL:-}" "${CLAUDE_PLUGIN_OPTION_URL:-}" "$saved" https://diffinery.com; do |
| 44 | base=$(origin_of "$u") |
| 45 | [ -n "$base" ] || continue |
| 46 | host=${base#*://} |
| 47 | host=${host%%:*} |
| 48 | pat=$(printf '%s' "$host" | sed 's/[.]/[.]/g') |
| 49 | slug=$(printf '%s\n' "$remotes" | |
| 50 | sed -n -E "s#^([A-Za-z][A-Za-z0-9+.-]*://)?([^@/]+@)?$pat(:[0-9]+)?[:/]+([A-Za-z0-9._-]+)/([A-Za-z0-9._-]+)/*\$#\\4/\\5#p" | |
| 51 | head -n 1) |
| 52 | [ -n "$slug" ] && break |
| 53 | done |
| 54 | [ -n "$slug" ] || return 0 |
| 55 | slug=${slug%.git} |
| 56 | |
| 57 | cli=no |
| 58 | if command -v diffinery >/dev/null 2>&1; then |
| 59 | cli=yes |
| 60 | elif [ -x "${DIFFINERY_INSTALL:-$HOME/.diffinery}/bin/diffinery" ]; then |
| 61 | cli="yes, at ${DIFFINERY_INSTALL:-$HOME/.diffinery}/bin/diffinery (not on PATH)" |
| 62 | fi |
| 63 | |
| 64 | # The CLI's token belongs to the instance the CLI points at: DIFFINERY_URL, else the saved URL. |
| 65 | cli_url=$(origin_of "${DIFFINERY_URL:-${saved:-https://diffinery.com}}") |
| 66 | signed=no |
| 67 | if [ "${cli_url#*://}" != "${base#*://}" ]; then |
| 68 | other=yes |
| 69 | else |
| 70 | other=no |
| 71 | if [ -n "${DIFFINERY_TOKEN:-}" ]; then |
| 72 | signed="yes (DIFFINERY_TOKEN)" |
| 73 | elif [ -f "$cfg" ] && grep -q '"token"' "$cfg" 2>/dev/null; then |
| 74 | signed=yes |
| 75 | fi |
| 76 | fi |
| 77 | |
| 78 | msg="This repository is hosted on the Diffinery instance at $base ($slug). Use the diffinery CLI (installed: $cli, signed in there: $signed) or the diffinery MCP tools for pull requests, CI and issues (they support Diffinery's --intent, auto-merge and run logs); gh works once \`diffinery auth setup-gh\` has signed it in to $host. The diffinery skill has the workflow." |
| 79 | case $cli in |
| 80 | no) msg="$msg Install the CLI with \`curl -fsSL $base/install | bash\`." ;; |
| 81 | esac |
| 82 | if [ "$other" = yes ]; then |
| 83 | msg="$msg The CLI points at ${cli_url:-another instance}: to use it here, ask the user to run \`diffinery setup --url $base\` (or \`diffinery login --url $base\`), or set DIFFINERY_URL=$base and DIFFINERY_TOKEN." |
| 84 | elif [ "$signed" = no ]; then |
| 85 | msg="$msg To sign in, ask the user to run \`diffinery login\` (or \`diffinery login --device\`), or set DIFFINERY_TOKEN." |
| 86 | fi |
| 87 | |
| 88 | # The text has no quotes or backslashes today; escape them anyway so the JSON stays valid. |
| 89 | esc=$(printf '%s' "$msg" | sed 's/\\/\\\\/g; s/"/\\"/g') |
| 90 | printf '{"hookSpecificOutput":{"hookEventName":"SessionStart","additionalContext":"%s"}}\n' "$esc" |
| 91 | } |
| 92 | |
| 93 | main 2>/dev/null || true |
| 94 | exit 0 |