devdesk/libexec/devdesk-lib.sh

# shellcheck shell=bash disable=SC2016 # single-quoted jq filters use jq variables ($n, $d, …)
# Shared helpers for the devdesk CLI and its libexec scripts. Sourced, not executed.
#
# Every path can be overridden from the environment so the test suite can run
# against a throwaway tmux server and state directory.

DEVDESK_ENV=${DEVDESK_ENV:-/etc/devdesk/env}
if [ -r "$DEVDESK_ENV" ]; then
    # shellcheck source=/dev/null
    . "$DEVDESK_ENV"
fi

: "${DEVDESK_PROJECTS_ROOT:=/root/code}"
: "${DEVDESK_DEFAULT_DIR:=$DEVDESK_PROJECTS_ROOT}"
: "${DEVDESK_DEFAULT_SESSION:=main}"
: "${DEVDESK_SOCKET:=/run/devdesk/tmux.sock}"
: "${DEVDESK_STATE_DIR:=/var/lib/devdesk}"
: "${DEVDESK_LIBEXEC:=/usr/lib/devdesk}"
: "${DEVDESK_SHARE:=/usr/share/devdesk}"
: "${DEVDESK_TMUX_UNIT:=devdesk-tmux.service}"

DEVDESK_REGISTRY="$DEVDESK_STATE_DIR/registry.json"
DEVDESK_CONTEXT_DIR="$DEVDESK_STATE_DIR/context"
DEVDESK_NAME_RE='^[A-Za-z0-9][A-Za-z0-9_-]{0,63}$'

dd_die() {
    printf 'devdesk: %s\n' "$*" >&2
    exit 1
}

# tmux client bound to the DevDesk server. -N: never start a server from here,
# because a server started by a client would live in the caller's cgroup (e.g.
# ttyd's) and die with it.
dd_tmux() {
    tmux -N -u -S "$DEVDESK_SOCKET" "$@"
}

dd_valid_name() {
    [[ $1 =~ $DEVDESK_NAME_RE ]]
}

# Directory name -> session name: anything outside [A-Za-z0-9_-] becomes '-',
# leading separators are dropped, max 64 chars.
dd_slugify() {
    local s=${1//[^A-Za-z0-9_-]/-}
    while [[ $s == [-_]* ]]; do s=${s:1}; done
    printf '%s' "${s:0:64}"
}

dd_server_up() {
    [ -S "$DEVDESK_SOCKET" ] && dd_tmux start-server 2>/dev/null
}

dd_ensure_server() {
    dd_server_up && return 0
    if [ -z "${DEVDESK_NO_SYSTEMD:-}" ] && [ -d /run/systemd/system ]; then
        # ExecStartPost on the unit blocks until the socket answers.
        systemctl start "$DEVDESK_TMUX_UNIT" ||
            dd_die "could not start $DEVDESK_TMUX_UNIT (see: journalctl -u $DEVDESK_TMUX_UNIT)"
        dd_server_up && return 0
    fi
    dd_die "tmux server is not running on $DEVDESK_SOCKET (start $DEVDESK_TMUX_UNIT)"
}

# --- registry: $DEVDESK_REGISTRY = {"sessions": {"<name>": {dir, claude_session_id, ...}}}

dd_registry_get() {
    [ -s "$DEVDESK_REGISTRY" ] || return 0
    jq -Mr --arg n "$1" --arg f "$2" '.sessions[$n][$f] // empty' "$DEVDESK_REGISTRY" 2>/dev/null
}

# dd_registry_update JQ_FILTER [jq args...] — read-modify-write under flock.
dd_registry_update() {
    local filter=$1
    shift
    mkdir -p "$DEVDESK_STATE_DIR"
    (
        flock -w 5 9 || exit 1
        [ -s "$DEVDESK_REGISTRY" ] || printf '{"sessions":{}}\n' >"$DEVDESK_REGISTRY"
        local tmp
        tmp=$(mktemp "$DEVDESK_REGISTRY.XXXXXX") || exit 1
        if jq "$@" "$filter" "$DEVDESK_REGISTRY" >"$tmp"; then
            chmod 600 "$tmp"
            mv -f "$tmp" "$DEVDESK_REGISTRY"
        else
            rm -f "$tmp"
            exit 1
        fi
    ) 9>"$DEVDESK_REGISTRY.lock"
}

dd_registry_set_dir() {
    dd_registry_update '.sessions[$n] = ((.sessions[$n] // {}) + {dir: $d, updated: $t})' \
        --arg n "$1" --arg d "$2" --arg t "$(date -Is)"
}

dd_registry_set_claude() {
    dd_registry_update '.sessions[$n] = ((.sessions[$n] // {}) + {claude_session_id: $id, claude_source: $src, updated: $t})' \
        --arg n "$1" --arg id "$2" --arg src "$3" --arg t "$(date -Is)"
}

dd_registry_remove() {
    dd_registry_update 'del(.sessions[$n])' --arg n "$1"
    rm -f "$DEVDESK_CONTEXT_DIR/$1.json"
}

dd_registry_rename() {
    dd_registry_update 'if .sessions[$old] then .sessions[$new] = .sessions[$old] | del(.sessions[$old]) else . end' \
        --arg old "$1" --arg new "$2"
    if [ -f "$DEVDESK_CONTEXT_DIR/$1.json" ]; then
        mv -f "$DEVDESK_CONTEXT_DIR/$1.json" "$DEVDESK_CONTEXT_DIR/$2.json"
    fi
}

# Project name (directory or its slug) -> absolute directory inside the projects root.
dd_project_dir() {
    local name=$1 dir="" d root
    if [ -d "$DEVDESK_PROJECTS_ROOT/$name" ]; then
        dir="$DEVDESK_PROJECTS_ROOT/$name"
    else
        for d in "$DEVDESK_PROJECTS_ROOT"/*/; do
            d=${d%/}
            if [ "$(dd_slugify "${d##*/}")" = "$name" ]; then
                dir=$d
                break
            fi
        done
    fi
    [ -n "$dir" ] || return 1
    dir=$(realpath -e -- "$dir" 2>/dev/null) || return 1
    root=$(realpath -e -- "$DEVDESK_PROJECTS_ROOT" 2>/dev/null) || return 1
    case "$dir/" in
    "$root"/*) printf '%s\n' "$dir" ;;
    *) return 1 ;;
    esac
}

# Session name -> working directory. Sessions don't need a project: the
# registry wins, then a project of the same name, then DEVDESK_DEFAULT_DIR.
dd_resolve_dir() {
    local name=$1 dir
    dir=$(dd_registry_get "$name" dir)
    if [ -n "$dir" ] && [ -d "$dir" ]; then
        printf '%s\n' "$dir"
    elif [ "$name" != "$DEVDESK_DEFAULT_SESSION" ] && dir=$(dd_project_dir "$name"); then
        printf '%s\n' "$dir"
    else
        realpath -e -- "$DEVDESK_DEFAULT_DIR" 2>/dev/null || printf '%s\n' "$HOME"
    fi
}

# Name of the DevDesk session this process runs in. Asks tmux, so it stays
# right after a rename; falls back to the DEVDESK_SESSION set at creation.
dd_current_session() {
    local name=""
    if [ -n "${TMUX:-}" ] && [ -n "${TMUX_PANE:-}" ]; then
        name=$(tmux display-message -p -t "$TMUX_PANE" '#S' 2>/dev/null)
    fi
    printf '%s\n' "${name:-${DEVDESK_SESSION:-}}"
}

# Arguments for `tmux new-session` that create session NAME in DIR running Claude.
dd_new_session_args() {
    printf '%s\0' -s "$1" -c "$2" -n claude -e "DEVDESK_SESSION=$1" "$DEVDESK_LIBEXEC/devdesk-claude-run"
}