keb
386af66565
- main: the subcommand is a name rather than nil-or-empty argument slices; the cache file and start directory are worked out once; config values with a default go through one valueOr helper. - The link handler's --config argument comes from one configArgs helper. - lazysecrets update parses its flags like the other subcommands, so -check and --check=true work too, and tells a development build by its dev version. - Instance reach is named (unreachable, switchable, inView), tmux client activity is compared as a number, and the best client loop starts from the first. - update: serverTimeout (it bounds the checksums request too), and parentheses in the platform check.
123 lines
3.3 KiB
Go
123 lines
3.3 KiB
Go
package instance
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import (
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"cmp"
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"os"
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"os/exec"
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"slices"
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"strconv"
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"strings"
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"git.kebcloud.no/keb/lazysecrets/internal/linkhandler"
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)
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// Where an instance shows depends on its terminal app (on macOS): for an
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// instance in tmux, the app of a tmux client showing its session, or one
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// that could be switched to it. front is the app the link was clicked in;
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// clients in it are preferred, so a link clicked in a terminal opens
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// there.
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// tmux runs tmux on the server this instance runs in.
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func tmux(args ...string) (string, error) {
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out, err := exec.Command("tmux", args...).Output()
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return strings.TrimSpace(string(out)), err
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}
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func inTmux() bool { return os.Getenv("TMUX") != "" && os.Getenv("TMUX_PANE") != "" }
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type client struct {
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name, session string
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activity int // Unix seconds
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pid int
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app string
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}
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// clients lists the tmux server's clients, the one last typed in first.
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func clients() []client {
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out, err := tmux("list-clients", "-F", "#{client_activity} #{client_pid} #{client_name} #{session_name}")
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if err != nil {
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return nil
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}
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var cs []client
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for _, l := range strings.Split(out, "\n") {
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f := strings.SplitN(l, " ", 4)
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if len(f) < 4 {
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continue
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}
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activity, err1 := strconv.Atoi(f[0])
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pid, err2 := strconv.Atoi(f[1])
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if err1 != nil || err2 != nil {
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continue
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}
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cs = append(cs, client{name: f[2], session: f[3], activity: activity, pid: pid, app: linkhandler.HostApp(pid)})
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}
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slices.SortStableFunc(cs, func(a, b client) int { return cmp.Compare(b.activity, a.activity) })
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return cs
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}
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// place is where this instance would show: the tmux client (zero outside
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// tmux), the app, and its reach.
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func place(front string) (client, string, int) {
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if !inTmux() {
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return client{}, linkhandler.HostApp(os.Getpid()), inView
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}
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session, err := tmux("display-message", "-p", "-t", os.Getenv("TMUX_PANE"), "#{session_name}")
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if err != nil {
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return client{}, "", unreachable
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}
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cs := clients()
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if len(cs) == 0 {
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return client{}, "", unreachable
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}
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// Best first: in the front app on its session, in the front app,
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// on its session, any.
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rank := func(c client) int {
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r := 0
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if front != "" && c.app == front {
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r += 2
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}
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if c.session == session {
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r++
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}
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return r
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}
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best := cs[0]
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for _, c := range cs[1:] {
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if rank(c) > rank(best) {
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best = c
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}
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}
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if best.session == session {
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return best, best.app, inView
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}
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return best, best.app, switchable
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}
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// Raise brings this instance into view for a link clicked in front: in
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// tmux its window and pane, switching a client to its session if needed;
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// then its app to the front, showing a hidden dropdown terminal.
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func Raise(front string) {
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c, app, reach := place(front)
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if reach == unreachable {
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return
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}
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if inTmux() {
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pane := os.Getenv("TMUX_PANE")
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_, _ = tmux("select-window", "-t", pane)
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_, _ = tmux("select-pane", "-t", pane)
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if reach == switchable {
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_, _ = tmux("switch-client", "-c", c.name, "-t", pane)
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}
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}
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switch {
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case app == "" || app == front:
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// already in front (or unknown)
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case linkhandler.IsDropdown(app):
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linkhandler.ShowDropdown(app) // it isn't front, so hidden: this shows it
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default:
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// The bundle, not the name: "kitty" may pick an instance without
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// windows, which then opens a new one.
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linkhandler.Activate(app)
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}
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}
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