29 Commits

Author SHA1 Message Date
Sameen Karim 754d190490 Fork unmerged branches into new stack (#154)
* Fork unmerged branches into a new stack when the base stack is fully merged

Once every PR that is officially part of a stack on GitHub has been merged
-- especially after the merged branches are deleted upstream -- you can no
longer add to that stack. A new PR on top would target the trunk directly
instead of chaining onto the merged PRs, so the remote stack's "each PR's
base ref is the previous PR's head ref" invariant no longer holds. On the
next `gh stack submit`, the stack update was rejected and surfaced as a
confusing, dead-end warning:

    Failed to update stack on GitHub: Pull requests must form a stack,
    where each PR's base ref is the previous PR's head ref

`submit` had no handling for this: `syncStack` always sent the full PR list
(including the merged-and-deleted ones), so the API rejected the broken
chain even though the new PRs had already been created with correct bases.

Fork the survivors into a fresh stack instead of failing. After syncing PR
state and before pushing, `runSubmit` now calls `maybeForkFromMergedBase`:

- It triggers only when every PR officially part of the tracked remote
  stack (`s.ID`) has merged. Membership is read from the stacks API, so
  open PRs that are not part of the remote stack do not count, and -- this
  is the key guard -- a normal partial, bottom-up merge (where the remote
  stack still lists an open PR) is left completely untouched. A cheap
  pre-check (the local stack must have at least one merged branch) avoids
  an extra ListStacks call on the common path.
- The local branches are partitioned: those still in the merged remote
  stack stay behind; everything else (new branches, plus open PRs that were
  never part of that remote stack) is lifted into a brand-new stack rooted
  at the original trunk, with an empty remote ID. The bottom survivor is
  re-based onto the trunk.
- `runSubmit` continues with the new stack, so the push loop, PR creation,
  and `syncStack` all operate on it; the empty ID routes `syncStack` through
  the adopt/create path and a fresh stack is created on GitHub.
- The original, fully merged stack is left untouched on GitHub. Locally it
  is kept as a record only if at least one of its branches still exists in
  the working copy; otherwise it is dropped. No data is lost -- those PRs
  are already merged on GitHub.

To restructure the stack file safely, add `StackFile.IndexOfStack`, which
locates a stack by pointer identity so the fork can capture what it needs
before `AddStack`/`RemoveStack` reallocate the underlying slice.

Also soften the partial-merge case that does not fork: when an `UpdateStack`
call fails with the "must form a stack" 422 and the stack still contains
merged branches, report it as an informational note (the unmerged PRs were
pushed and re-based onto the trunk) rather than a scary failure warning.

Scope is limited to `submit`. `add` and `checkout` keep their existing
"refuse and suggest `gh stack init`" behavior on fully merged stacks.

Tests:
- cmd/submit_test.go: TestSubmit_ForksWhenRemoteStackFullyMerged covers both
  disposition variants (the old stack is removed when its merged branches
  are gone locally, kept when they still exist) and asserts that only the
  new branches are pushed, the fork message is printed, a fresh stack is
  created, and the local stack file is split into two stacks.
  TestSubmit_NoForkWhenRemoteStackHasOpenPR verifies the everyday bottom-up
  merge is not forked and that the broken-chain 422 is reported calmly.
  TestUpdateStack_BrokenChainAfterMerge checks the calm-vs-warn branch.
- internal/stack/stack_test.go: TestIndexOfStack covers identity lookup and
  the not-found case.

Docs: README, the CLI reference, the stacked-PRs guide, the FAQ, and the
agent SKILL.md note that submitting onto a fully merged stack starts a new
stack rooted at the trunk.

* Handle fully merged stacks gracefully in the view and modify TUIs

Merged branches (and their PRs) are not selectable, so once an entire stack
has landed there is nothing to act on -- yet the TUIs did not reflect that:

- `gh stack view` still drew a highlighted cursor on the top branch even
  though it could not be selected. Navigation, checkout, and the per-branch
  toggles all silently did nothing, with no indication of why.
- `gh stack modify` opened its full editor on a stack with nothing left to
  restructure, instead of short-circuiting like `gh stack submit` does when
  there is nothing to submit.

Reflect the "nothing actionable" state in both TUIs.

View (internal/tui/stackview/model.go):

- Hide the cursor when every branch is merged. `New` now starts the cursor
  at -1 and only lands it on the current or first non-merged branch; when
  none exists the cursor stays hidden, so no row is rendered as focused. The
  existing `m.cursor >= 0` guards and merged-skipping `moveCursor` already
  make every cursor action a no-op in that state, and mouse-wheel scrolling
  still works for tall merged stacks.
- Dim the shortcuts that depend on the cursor. `buildHeaderConfig` marks
  navigate, commits, files, open PR, and checkout as `Disabled` (rendered
  gray via the existing ShortcutEntry.Disabled styling) when all branches
  are merged, leaving only `q quit` active.

Modify (cmd/modify.go):

- Short-circuit before opening the TUI. After preconditions pass and PR
  state is synced, `runModify` now returns early when the stack is fully
  merged, printing "All branches in this stack have been merged" and
  pointing at `gh stack init`, exiting cleanly (exit 0) like submit's
  "nothing to submit" path. The linearity and merge-queue precondition
  checks already skip merged branches, so they do not fire spuriously.

Tests:
- internal/tui/stackview/model_test.go: the cursor is hidden (-1) when all
  branches are merged; up/down/enter do not move it or trigger a checkout;
  View renders without panicking on a hidden cursor; buildHeaderConfig
  disables every cursor-dependent shortcut (and only those) when all merged,
  and leaves them all enabled when active branches remain.
- cmd/modify_test.go: runModify short-circuits on a fully merged stack,
  printing the message and returning no error without launching the TUI.
2026-06-29 20:11:09 -04:00
Sameen Karim 797c62e9b4 Adapt theme colors to light and dark terminals (#149)
* Make the TUIs adapt to light and dark terminal backgrounds

The submit, view, and modify TUIs were tuned for dark terminals. On light
or solarized-light backgrounds the result was hard to read and inverted:
primary text used ANSI white (invisible on white), dim chrome used light
grays (too faint), and accents used bright cyan (low contrast) — so
"active" things looked lighter than "disabled" ones.

Introduce a centralized, background-aware color palette and migrate all
three TUIs to it:

- internal/tui/shared/theme.go: a semantic palette of lipgloss.AdaptiveColor
  values (primary/muted/faint text, chrome/border, accent, PR-state colors,
  badge backgrounds, row shade, button, switch). lipgloss resolves the
  light/dark variant per render from the terminal background, which Bubble
  Tea detects at startup; terminals that don't report it fall back to dark,
  preserving the original look.
- Replace every hardcoded ANSI color in shared/, submitview/, and
  modifyview/ with palette roles. The four pre-rendered status icons now
  render at use-time so their adaptive colors resolve correctly. The submit
  markdown preview picks glamour's light or dark style from the detected
  background.
- GH_STACK_THEME=auto|light|dark forces the palette for terminals that
  mis-detect (some SSH/tmux setups); wired via the root command's
  PersistentPreRun before any render. Documented in the README and CLI docs.

Neutral text/chrome use truecolor hex (GitHub Primer-inspired) for
predictability across themes, including solarized which repurposes ANSI
8-15; lipgloss downsamples on terminals without truecolor.

Tests verify the palette resolves differently for light vs dark and that
GH_STACK_THEME is honored.

* Apply background-aware colors to all command output

Background detection and the GH_STACK_THEME override (added for the TUIs)
only affected the interactive screens. Plain command output -- status
messages and interactive prompts -- went through the mgutz/ansi library
with fixed ANSI palette names (green/red/yellow/cyan/...), so it never
adapted to the terminal background and could read poorly on light or
solarized themes.

Unify everything on the same adaptive palette so all colors react to the
detected background and to GH_STACK_THEME.

- Extract internal/theme, a foundational package with no internal
  dependencies, that owns:
    - the background-aware lipgloss.AdaptiveColor palette (moved out of
      internal/tui/shared),
    - ApplyOverride(), the GH_STACK_THEME=auto|light|dark logic, and
    - non-TUI colorizers (Success/Error/Warning/Blue/Magenta/Cyan/Gray/
      Bold) plus FgSeqs(), which returns the raw start/reset escapes used
      to color the user's echoed prompt input.
- internal/tui/shared/theme.go now re-exports the palette, so the TUI code
  keeps referring to shared.ColorX unchanged.
- internal/config/config.go wires the Config.Color* funcs to the theme
  colorizers and drops mgutz/ansi (now an indirect dependency only).
- cmd/utils.go colors the prompt icon and echoed input via theme.
- cmd/root.go calls theme.ApplyOverride() in PersistentPreRun.

Detection adds no cost: because the command package imports Bubble Tea,
its init() already triggers (and caches) the terminal background query for
every command, so the non-TUI colorizers just read the cached value.
Terminals that don't answer the query fall back to the dark palette;
GH_STACK_THEME=light|dark forces it. Colors are truecolor on capable
terminals and downsample to the nearest ANSI color elsewhere.

Tests: internal/theme covers palette adaptiveness, ApplyOverride, the
colorizers, and FgSeqs; a new internal/config test verifies the wired-up
Config.Color* funcs adapt to the background when color is enabled.

Docs: README and the CLI reference note that GH_STACK_THEME now controls
all colored output, not just the interactive screens.

No behavior change beyond colors.
2026-06-29 20:11:09 -04:00
Sameen Karim b6bcce1bfe Add an interactive submit TUI for customizing each PR's title, description, and draft state (#147)
* Add submitview data model and PR draft override plumbing

Introduce the internal/tui/submitview package that will back the new
interactive `gh stack submit` TUI, and wire its per-PR override contract
into the submit command without changing current behavior.

- submitview: BranchState model (NEW/OPEN/DRAFT/QUEUED/MERGED/CLOSED) with
  selectability/editability rules, SubmitNode UI state with edit detection,
  PRDraft override type, state derivation, title/description prefill, and
  state-badge/panel/tab styles.
- submit: refactor ensurePR/createPR to accept an optional per-branch
  override map (title/body/draft/include); deselected NEW branches are
  pushed but get no PR.

The override map is nil on the --auto / non-interactive path, so the
agent-compat contract is unchanged. Fully unit tested.

* Add single-screen submit TUI

Introduce an interactive, single-screen editor for `gh stack submit`,
built on Bubble Tea and Lip Gloss.

The left panel renders the stack as a connected tree down to the trunk.
Every branch without a PR is included by default; deselect one with its
checkbox or `^x`. Because each PR builds on the branch below it,
deselecting a branch also deselects the ones stacked above it, and
re-including a branch re-includes the ones below it that it depends on.
The cursor uses its own cyan accent so it reads distinctly from the green
new/included color; existing PRs are shown dimmed with a no-entry glyph.

The right panel edits the focused branch's PR in web-create-PR order: a
header with the branch name and an include chip ("Creating PR" /
"Skipped"), the title, a scrollable description (Glamour markdown preview
and $EDITOR escape, with a scrollbar and mouse click-to-position), and a
ready to draft segmented toggle (defaulting to ready). A footer strip
shows the PR progress, the next branch, and the editor hints. Skipping a
branch dims its body; branches that already have a PR show a read-only
card linking to the PR.

It shares the gh-stack header (art, title, stack info, and keyboard
shortcuts) with `gh stack view` and `gh stack modify` for a unified look.
Submit every included PR at once with Ctrl+S. Full keyboard and mouse
support throughout.

* Wire the single-screen submit TUI into `gh stack submit`

Launch the submit editor from `gh stack submit` in interactive terminals,
collecting per-branch PR drafts and applying them in a single batch. In
non-interactive terminals or with --auto, fall back to auto-generated
titles and skip the editor. Update the README and CLI reference to
describe the single-screen flow.

* Use the API PR title/body for existing PRs and fix new-PR defaults

For existing PRs, the submit TUI showed a commit/template-derived draft
instead of the pull request's real title and body. Fetch the actual title
and body and render them in the read-only card:

- open/draft/queued (tracked) and adopted-open PRs now carry title/body
  through the existing batch sync (added the fields to the GraphQL queries
  and PRDetails — no extra round trips), and
- merged branches (which skip the live refresh) are filled in by a targeted
  enrichment step run only when the submit TUI opens.

Also align the new-PR defaults with the non-TUI submit's defaultPRTitleBody:

- Title: the commit subject only when the branch has exactly one commit,
  otherwise the humanized branch name (was: the oldest commit's subject even
  for multi-commit branches).
- Description: the PR template, else the single commit's body, else empty
  (removed the bulleted commit-subject list for multi-commit branches).

* Stop mouse wheel from leaking escape characters into form fields

Scrolling the mouse wheel while a title or description field was focused
could insert stray characters such as "[<65;54;51M" into the field. The
submit TUI ran the Bubble Tea program with WithMouseAllMotion (mode 1003),
which reports an event on every pointer move. During a wheel scroll that
floods the input stream, and under that volume Bubble Tea splits an SGR
mouse escape sequence ("\x1b[<Cb;Cx;Cy(M|m)") across input reads; the
leftover bytes of a partially-parsed sequence are then emitted as key
runes and inserted into the focused text input.

Two changes fix this:

  - Switch to WithMouseCellMotion (mode 1002), which reports clicks, drag,
    and wheel but not idle pointer motion. That removes the per-move input
    flood, so under a real terminal's reads (up to 256 bytes) the only
    fragment that still surfaces is a single, clean burst at each wheel
    notch boundary. The TUI never used idle-hover for rendering, so
    cell-motion loses nothing.

  - Drop any leaked fragments before they reach a field. A split SGR mouse
    sequence surfaces as an Alt+"[" (the consumed "\x1b[") followed by
    body fragments ("<65;54;5", "1M"), or occasionally the whole body in
    one run ("[<65;54;51M"). consumeLeakedMouseKey recognises the start,
    swallows the body up to its "M"/"m" terminator, and bails out the
    moment a rune does not fit an SGR body, so ordinary typing (including
    "<", ";", digits, "M") and bracketed pastes are never eaten.

Tests cover every split point of an SGR sequence, single-run tails,
preserved real typing, a stray Alt+"[", bracketed paste, and that wheel
events never modify the focused field. Verified end-to-end by feeding
1,500 wheel sequences through the real parser under terminal-sized reads
and confirming the field stays empty.

* Re-enable mouse tracking after the external editor closes

Opening the description in $EDITOR with ^e and then quitting left the
mouse unresponsive: clicks and wheel scrolling stopped working while
keyboard navigation still did.

The editor is launched with tea.ExecProcess, which releases the terminal
before running the command and calls Bubble Tea's RestoreTerminal when it
returns. RestoreTerminal re-enables the alt-screen, bracketed paste, and
focus reporting, but it does not re-enable mouse tracking. The editor
(e.g. vim) disables mouse reporting on exit, so once control returns to
the TUI the terminal no longer emits mouse events.

Re-arm mouse mode when the editor-finished message arrives by batching
tea.EnableMouseCellMotion with the handler's command. That re-enables
cell-motion and SGR mouse reporting, matching the WithMouseCellMotion
option the program starts with, on every editor-return path (success or
error).

* dead code cleanup

* support mouse input to move cursor in title field

* use textArea for title to support word wrap for long inputs
2026-06-29 20:11:08 -04:00
Sameen Karim 0efc764f8c Redesign TUI shared header and embed the GitHub logo as an image (#143)
* Redesign the shared header and embed the GitHub logo as an image

Rework the shared gh-stack header (used by `view` and `modify`, and reused
by `submit` later in this stack) for a cleaner, more responsive look, and
replace the braille/ASCII Invertocat with a real image of the GitHub mark.

- Logo: embed the Invertocat PNG with go:embed and draw it via an inline-
  image protocol (kitty or iTerm2). It is image-or-nothing: when no protocol
  is available, stdout is not a TTY, or we are inside tmux/screen, no logo is
  drawn and the text falls back to the normal left padding. Detection is
  environment-based and cached so it never blocks the TUI, and a fixed kitty
  image id lets the header clear or replace the logo in place instead of
  leaving copies behind.
- Layout: place the logo in the top-left corner beside the title and version,
  with the stack-info lines left-aligned beneath it on the same left margin.
  Size the box to its content for each view so there is no trailing empty row.
- Responsiveness: hide the logo progressively — first when the viewport is too
  narrow, then a little before the rest of the header at short heights, where
  a vertical resize could otherwise leave a ghost of the inline image.
- Add unit tests for the header's responsive thresholds.

* Drop the unused HeaderHeight constant and dedupe the header config build

Follow-up to review feedback on the shared-header redesign:

- Remove the HeaderHeight constant. Nothing referenced it (callers compute
  height via HeaderHeightFor), and its doc described a "maximum" that
  HeaderHeightFor does not actually enforce, so the comment was misleading.
- In the view and modify View() methods, build the header config once and reuse
  it for both RenderHeader and the height reservation instead of rebuilding it
  twice per frame. The click/scroll handlers keep deriving the height from the
  same config, so the header's dimensions remain a single source of truth.
2026-06-29 20:11:08 -04:00
Sameen Karim 4c05e58b83 cache selected remote (#128)
* Save selected remote to gh-stack.remote git config

Users with multiple git remotes are prompted to choose a remote on
every gh stack operation, which is tedious. This adds the ability to
persist that choice so it only needs to be made once.

When a user interactively selects a remote (because multiple remotes
exist and none is configured as a push default), they are now shown a
Y/n follow-up prompt offering to save that remote for all future gh
stack operations. If accepted, the choice is written to the local git
config key `gh-stack.remote`, and instructions for changing or clearing
it are printed.

The saved remote is checked in `ResolveRemote` after the standard git
push config keys (branch.<name>.pushRemote, remote.pushDefault,
branch.<name>.remote) but before falling back to listing all remotes.
This means per-branch git push configuration still takes precedence,
and the --remote flag on individual commands continues to override
everything.

All commands that resolve a remote (push, submit, sync, rebase,
checkout, link, modify, trunk) go through the shared `pickRemote`
helper, so they all benefit automatically.

Changes:

- Add GetSavedRemote, SaveRemote, ClearRemote to the git Ops interface,
  defaultOps implementation, public wrappers, and MockOps
- Check gh-stack.remote in ResolveRemote's priority chain
- Move pickRemote from push.go to utils.go as a shared helper
- Add save-remote confirmation prompt after interactive remote selection
- Add unit tests for pickRemote save/decline/skip/override flows
- Add integration tests for ResolveRemote with saved remote and
  precedence, and for the SaveRemote/GetSavedRemote/ClearRemote
  lifecycle

* add error message for save failure

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
2026-06-15 13:54:20 -04:00
Sameen Karim 7413e8889d Fix force-with-lease push for branches without tracking refs (#124)
gh stack sync could rebase a stack successfully then fail the final
force push with "stale info" when a branch lacked a local tracking ref
(refs/remotes/<remote>/<branch>). This happened because:

1. FetchBranches pre-filtered branches by existing tracking ref, so a
   branch with no tracking ref was never fetched and never gained one.
2. Push used a bare --force-with-lease flag, which has no lease basis
   for a branch without a tracking ref, causing git to reject the push.

FetchBranches now uses explicit refspecs for every branch:
  +refs/heads/<branch>:refs/remotes/<remote>/<branch>
This creates or updates tracking refs regardless of prior state. The
fast-path (single fetch) and per-branch fallback (for branches absent
on the remote) are preserved.

Push now builds explicit per-branch lease arguments when force=true:
  --force-with-lease=refs/heads/<branch>:<tracking-ref-sha>
for branches with a tracking ref, or:
  --force-with-lease=refs/heads/<branch>:
(empty expected value = "must not exist") for branches absent on the
remote. Explicit destination refspecs (<branch>:refs/heads/<branch>)
remove dependence on push.default and upstream configuration. The
non-force push path is unchanged.

Added 6 integration tests using real bare git remotes:
- Branch with current tracking ref: push succeeds
- Tracking ref deleted locally (regression test for #118): push succeeds
- Remote advanced by another client: push rejected (safety preserved)
- New branch absent on remote: created via empty-expect lease
- New branch race condition: rejected (safety preserved)
- Mixed stack (tracked + untracked branches): all succeed after fetch

Fixes #118
2026-06-15 13:54:18 -04:00
Sameen Karim a4485f5298 submit: disable auto-merge on existing PRs before adding to stack (#120)
When a user runs `gh stack submit` and an existing PR is discovered for
a branch via `FindPRForBranch`, that PR may have auto-merge enabled.
Auto-merge is incompatible with stacked PRs because the PR would merge
on its own, breaking the stack's base chain.

Previously, the eligibility guard for auto-merge was only in the `link`
command (which blocks such PRs with an error). The `submit` command had
no such check, allowing users to add auto-merge-enabled PRs to a stack
by running `init` followed by `submit`.

This change adds auto-merge detection and automatic disabling in
`submit`'s `ensurePR` function. When an existing PR with auto-merge
enabled is discovered, the CLI disables auto-merge via the
`disablePullRequestAutoMerge` GraphQL mutation and warns the user.
If the disable call fails, submit continues with a warning (non-fatal).

The `link` command retains its stricter behavior of blocking auto-merge
PRs outright, since the user explicitly chose those PRs and can fix
them before retrying.

Changes:

  internal/github/github.go:
  - Add DisableAutoMerge() method using the
    disablePullRequestAutoMerge GraphQL mutation

  internal/github/client_interface.go:
  - Add DisableAutoMerge(prID string) error to ClientOps interface

  internal/github/mock_client.go:
  - Add DisableAutoMergeFn field and mock implementation

  cmd/submit.go:
  - In ensurePR, after discovering an existing PR with auto-merge
    enabled, call DisableAutoMerge before proceeding. Warns on
    success ("Disabled auto-merge for PR #N (incompatible with
    stacked PRs)") and on failure ("failed to disable auto-merge").

  cmd/submit_test.go:
  - Add TestSubmit_DisablesAutoMergeOnExistingPR: verifies auto-merge
    is disabled and warning is shown
  - Add TestSubmit_DisableAutoMergeFailure_ContinuesWithWarning:
    verifies submit continues even if the disable call fails
  - Add TestSubmit_NoAutoMerge_SkipsDisable: verifies DisableAutoMerge
    is not called for PRs without auto-merge
2026-06-15 13:54:18 -04:00
Sameen Karim d235a21a9c alert for unsupported auth tokens (#113)
When users authenticate the GitHub CLI with a personal access token
(PAT) instead of OAuth (`gh auth login`), the `cli_internal` stacks
API endpoints return 404. The CLI previously interpreted this as
"Stacked PRs are not enabled for this repository," which is misleading
— the feature may be enabled, but the token type simply cannot access
the internal endpoints.

This is a recurring source of user confusion. The docs already note
that PATs are not supported, but users don't always read them before
hitting the error.

This change adds token-type detection by inspecting the `gh` auth
token prefix:

  - `gho_`        → OAuth (supported)
  - `ghs_`        → GitHub App installation token (supported)
  - `ghp_`        → Classic PAT (NOT supported)
  - `github_pat_` → Fine-grained PAT (NOT supported)

When a PAT is detected, the CLI now shows:

  ⚠ Personal access tokens are not supported by gh stack
    Run `gh auth login` to authenticate with OAuth instead.

Instead of the misleading:

  ⚠ Stacked PRs are not enabled for this repository

Changes:

- Add `internal/config/auth.go` with auth detection methods on Config:
  `IsPersonalAccessToken()`, `WarnIfPAT()`, and `RepoHost()`. Uses a
  `TokenForHostFn` field on Config for test overrides, following the
  same pattern as `GitHubClientOverride`.

- Add a pre-flight PAT check in `cmd/submit.go` before the
  `ListStacks` call. If a PAT is detected, the command aborts early
  with a clear error instead of making a doomed API call.

- Update all 404 handlers for `cli_internal` endpoints to check the
  token type and show the appropriate message:
  - `cmd/submit.go` (createNewStack)
  - `cmd/link.go` (listStacksSafe, createLink)
  - `cmd/checkout.go` (checkoutRemoteStack)

- Add `warnStacksUnavailableOrPAT()` helper in `cmd/utils.go` that
  shows the PAT-specific warning when applicable, falling back to the
  generic "not enabled" message for non-PAT tokens.

- Add unit tests in `internal/config/auth_test.go` for token prefix
  detection and warning output.

- Add integration tests in `cmd/submit_test.go` verifying that both
  classic PATs (`ghp_`) and fine-grained PATs (`github_pat_`) trigger
  the pre-flight check and abort before any API calls.

- Add `warnStacksUnavailableOrPAT` tests in `cmd/utils_test.go`
  verifying correct message selection based on token type.

- Update existing 404 tests to explicitly set an OAuth token so they
  continue exercising the ListStacks 404 path.
2026-06-15 13:54:17 -04:00
Sameen Karim d2a390f2ff link: block merged, closed, queued, and auto-merge-enabled PRs (#112)
The `link` command previously allowed PRs in any state to be added to a
stack, including PRs that had already been merged, were closed, were
sitting in a merge queue, or had auto-merge enabled. Adding such PRs to
a stack is invalid because they have already been or will soon be merged,
which breaks the stacked PR workflow.

Add a new validation phase (Phase 2b) to `runLink` that checks the
eligibility of every existing PR found during lookup, before any new PRs
are created or stack operations are performed. Only open/draft PRs
without auto-merge enabled are eligible. All ineligible PRs are reported
at once with a clear per-PR error message indicating the specific reason
(merged, closed, in merge queue, or auto-merge enabled).

Changes:

  internal/github/github.go:
  - Add AutoMergeRequest struct and field on PullRequest
  - Add IsAutoMergeEnabled() method on *PullRequest
  - Update FindPRByNumber and FindPRForBranch GraphQL queries to fetch
    the autoMergeRequest field

  internal/github/github_test.go:
  - Add TestPullRequest_IsAutoMergeEnabled (nil, non-nil, nil receiver)

  cmd/link.go:
  - Add pr field to resolvedArg to retain full PR data from lookup
  - Add validatePREligibility() that rejects merged/closed/queued/
    auto-merge-enabled PRs with descriptive error messages
  - Wire validation into runLink between PR lookup and stack operations

  cmd/link_test.go:
  - Add 7 tests covering each disallowed state by PR number and branch
    name, plus a multi-invalid-PR reporting test
2026-06-01 15:54:30 -07:00
Sameen Karim 49a753708c insert branches with modify (#107)
* add insert branch operation to modify TUI

Add `i` (insert below) and `I` (insert above) key bindings to the
interactive modify view, allowing users to insert new empty branches
into an existing stack. This follows Vim-inspired semantics where
lowercase `i` inserts below the cursor and uppercase `I` inserts above.

## TUI behavior

When the user presses `i` or `I`, the TUI enters an insert input mode
(similar to rename mode) where they type a new branch name. The input
is validated against git ref naming rules, local branch uniqueness, and
in-stack name collisions. On confirm, a placeholder node is inserted at
the correct position in the branch list with a green "✚ insert"
annotation badge and green connector styling.

Insert is a structure operation — it works alongside fold, rename, and
drop, but is mutually exclusive with reorder (consistent with existing
mode exclusivity rules). Undo (`z`) removes the inserted node cleanly.

## Apply engine

At apply time (Step 2 in the pipeline, between renames and folds), the
engine creates the new git branch at the parent branch's tip via
`git.CreateBranch` and inserts a `BranchRef` into the stack metadata at
the correct position. If the insertion changes the base of a branch
that has an open PR, `affectsPRs` is set to trigger a required
`gh stack submit` afterward.

## Header shortcut updates

- Combined the fold shortcuts into a single line: `d/u - fold down/up`
- Added insert shortcuts on their own line: `i/I - insert below/above`
- Reordered fold references throughout to list "down" before "up" for
  consistency with the insert shortcut ordering

## Files changed

- types.go: ActionInsertBelow/ActionInsertAbove types, IsInserted field,
  InsertedBranches in ApplyResult
- model.go: key bindings, insert input mode, undo, mode exclusivity,
  annotation, styling, header shortcuts, effective-index tracking to
  prevent false reorder detection when inserts shift node positions
- styles.go: green insert badge/branch/connector styles
- status.go: insert counting in pending change summary
- help.go: new "Insert below / above" section, reordered fold heading
- apply.go: BuildPlan and ApplyPlan handle insert actions
- modify.go: updated command description and success summary
- README.md: updated keybindings table

## Test coverage

- 16 new TUI tests: insert below/above, top/bottom edges, undo, mode
  exclusivity, merged branch guard, cancel/empty input, duplicate name
  validation, pending summary counting, annotation rendering, mixed
  operations with drop/fold, apply acceptance
- 4 new apply tests: BuildPlan produces correct insert actions,
  ApplyPlan creates branches and updates stack metadata, insert at
  stack start uses trunk as parent, affectsPRs triggered when inserting
  before a branch with an open PR

* update add error msg to direct users to modify for inserting branches

* docs updates

* fix insert branch bugs in modify TUI

Fix three bugs with the insert branch feature in the modify TUI, and
adjust rename behavior on inserted nodes.

## Bug 1: False "moved" annotations on existing branches

After inserting a branch, all branches below the insertion point
displayed "↕ moved 1 layer down" annotations. This happened because
`nodeAnnotation` and `toNodeData` compared each node's
`OriginalPosition` against its raw array index, which gets shifted
when an inserted node is added to the slice.

Fix: introduce an `effectiveIdx` parameter that counts only
non-inserted nodes, so position comparisons reflect the original
ordering. The View loop computes effective indices by incrementing
only for non-inserted nodes and passes them to the rendering
functions.

## Bug 2: Header branch count inflated by staged inserts

The branch count in the header ("N branches") included inserted
placeholder nodes, making it appear as though the stack had grown
before changes were applied.

Fix: `buildHeaderConfig` now excludes `IsInserted` nodes from the
branch count. The count reflects only the original branches in the
stack.

## Bug 3: Operations allowed on inserted placeholder nodes

Inserted nodes could be folded into other branches, which makes no
sense for a placeholder with no commits. Additionally, the "last
branch" guard counted inserted nodes as active, allowing users to
drop all original branches and bypass the empty-stack check.

Fix:
- `fold()` rejects inserted nodes with a descriptive error message.
- `toggleDrop()` on an inserted node removes it entirely and pops
  the original insert action from the undo stack (clean cancellation
  rather than a separate undo entry).
- All three "active branch" guards (`toggleDrop`, `fold`, `tryApply`)
  now exclude `IsInserted` nodes, ensuring at least one original
  branch always remains in the stack.

## Rename on inserted branches

Instead of blocking renames on inserted nodes, pressing `r` now
enters rename mode and updates the insert action's name in place.
The node's `Ref.Branch` and `PendingAction.NewName` are both updated
directly — no separate rename action is created in the undo stack.
This lets users fix a typo without having to drop and re-insert.

## Tests added

- `TestInsertDoesNotShowMovedAnnotation` — verifies no false move
  annotations appear on existing branches after an insert
- `TestBranchCountExcludesInserts` — verifies header count stays
  stable after insert
- `TestCannotFoldInsertedBranch` — verifies fold is blocked
- `TestCannotRenameInsertedBranch` — verifies rename updates the
  insert name in place
- `TestDropInsertedBranchRemovesIt` — verifies drop removes the node
- `TestDropInsertedBranchCanBeUndone` — verifies drop pops the
  original insert from the undo stack
- `TestCannotDropAllOriginalBranchesWithInsert` — verifies the
  empty-stack guard excludes inserted nodes

* ensure cannot fold into an inserted branch

* rm dead code

* delete inserted branches during abort
2026-05-26 17:39:38 -04:00
Sameen Karim 9cc827dc78 modify: only require submit when changes affect PRs (#106)
* modify: only require submit when changes affect PRs

Previously, `gh stack modify` always transitioned to `PhasePendingSubmit`
after completing on any stack with a remote ID (`s.ID != ""`). This blocked
the user from running another `modify` until they ran `gh stack submit`,
even when the modifications only touched local branches without PRs.

This was overly restrictive. If a user is working at the top of their stack
with branches that haven't been pushed or had PRs created yet, restructuring
those branches is a purely local operation — there is no remote state to
reconcile, and no reason to force a submit before allowing further modifies.

## What changed

The condition for entering `PhasePendingSubmit` is now
`s.ID != "" && affectsPRs` instead of just `s.ID != ""`.

A new `affectsPRs` flag is tracked throughout the apply process. It is set
to `true` when any of the following occurs:

- A **renamed** branch has a `PullRequest` ref
- A **folded** branch (source or target) has a `PullRequest` ref
- A **dropped** branch has a `PullRequest` ref
- A **rebased** branch (during cascading rebase) has a `PullRequest` ref

If none of these conditions are met, the modify state file is cleared
immediately — no pending-submit lock, no "run `gh stack submit`" prompt.

## Changes by file

**`internal/modify/state.go`**
- Added `AffectsPRs bool` field to `StateFile`. This persists the flag
  across conflict boundaries so that `ContinueApply` knows whether
  actions applied before the conflict already affected PR branches.

**`internal/modify/apply.go`**
- `ApplyPlan`: tracks `affectsPRs` through each step (rename, fold, drop,
  rebase). Saves the flag into conflict state when a conflict occurs.
  Uses `s.ID != "" && affectsPRs` for the pending-submit decision.
- `ContinueApply`: initializes `affectsPRs` from the saved state file,
  then checks the conflict branch and remaining branches for PRs during
  the cascading rebase. Uses the same combined condition.
- Both functions set `result.NeedsSubmit` / show the "run submit" message
  only when the flag is true.

**`internal/tui/modifyview/types.go`**
- Added `NeedsSubmit bool` to `ApplyResult` so the caller can use it
  for the success message.

**`cmd/modify.go`**
- `printModifySuccess` now takes its cue from `result.NeedsSubmit`
  instead of `s.ID != ""`. The "run `gh stack submit`" hint is only
  shown when PR branches were actually affected.

**`internal/modify/apply_test.go`**
- Updated `TestApplyPlan_PendingSubmitForRemoteStack` to use branches
  with PRs and trigger an actual rebase, validating the pending-submit
  path correctly.
- Added `TestApplyPlan_ClearsStateForRemoteStackWithNoPRBranches`:
  remote stack where no branches have PRs → state is cleared.
- Added `TestApplyPlan_PendingSubmitOnlyWhenPRBranchesAffected`:
  remote stack with a mix of PR and non-PR branches, only the non-PR
  branch is renamed → state is cleared, `NeedsSubmit` is false.

## Behavior summary

| Scenario | Before | After |
|---|---|---|
| Modify on local stack (no remote ID) | State cleared | State cleared (unchanged) |
| Modify on remote stack, PR branches affected | `PhasePendingSubmit` | `PhasePendingSubmit` (unchanged) |
| Modify on remote stack, only local branches affected | `PhasePendingSubmit`  | State cleared  |

The `CheckStateGuard` function (used by `add`, `push`, `sync`, `unstack`,
`rebase`) already did not block on `PhasePendingSubmit`, so those commands
are unaffected by this change.

* clear state after saving stack

* clarify submit requirement in description

* assign value directly
2026-05-26 17:39:38 -04:00
Sameen Karim 1085b84e40 swtich to nearest surviving branch after modify (#105)
* swtich to nearest surviving branch after modify

After `gh stack modify` applies changes, the user may end up on an
orphaned branch that is no longer part of the stack — for example, if
their checked-out branch was dropped, folded into another branch, or
renamed. Previously, the code blindly restored the original branch
regardless of whether it still existed in the stack.

Add a `resolveCheckoutBranch` helper that inspects the modify plan and
the post-modify stack to determine the best branch to check out:

  1. Still in stack  → keep the original branch (no-op)
  2. Renamed         → check out the new name
  3. Folded down     → check out the fold target (branch below)
  4. Folded up       → check out the fold target (branch above)
  5. Dropped         → check out the nearest surviving neighbor
                       (prefer above, fall back to below)
  6. Fallback        → topmost branch in the stack

Both `ApplyPlan` and `ContinueApply` (the `--continue` path) now use
this helper instead of unconditionally restoring the original branch.
When the resolved branch differs from the original, a message is
printed so the user knows they've been switched.

The resolution uses the pre-modify snapshot (already persisted in the
state file) to determine original adjacency, so it works correctly even
when multiple branches are removed in the same operation.

Includes 12 new tests:
  - 9 unit tests for resolveCheckoutBranch covering all action types,
    edge cases (topmost dropped, multiple drops, empty stack), and
    the fallback path
  - 3 integration tests verifying ApplyPlan checks out the correct
    branch after drop, fold-down, and rename operations

* handle CheckoutBranch errors

* handle renamed branches
2026-05-26 17:39:38 -04:00
Sameen Karim 89643dc8db input prompter improvements (#98)
* include prefix in branch name input

* custom prompter with colored input text

* minor fix: arrow direction for initialized stack

* fix comment

* handle SetTermMode err
2026-05-26 17:39:37 -04:00
Sameen Karim b219e96fb5 rebase with preserve dates opt (#96)
* Add --committer-date-is-author-date flag to gh stack rebase

Introduce an opt-in `--committer-date-is-author-date` flag (with
`--preserve-dates` alias) for `gh stack rebase`. The flag is passed
through to every underlying `git rebase` invocation in the cascade,
keeping committer dates equal to author dates so that identical content
rebased onto an identical parent produces stable SHAs. This reduces
spurious force-push notifications and noisy review timelines, especially
in deep stacks where bottom branches get re-rebased on every merge.

Git layer changes:
- Add `RebaseOpts` struct with `CommitterDateIsAuthorDate` field to
  `internal/git/gitops.go`
- Update `Ops` interface, `defaultOps`, public wrappers, and
  `rebaseContinueOnce`/`tryAutoResolveRebase` helpers to accept and
  forward the flag
- Update `MockOps` to match the new signatures

Command layer changes:
- Register `--committer-date-is-author-date` and `--preserve-dates`
  flags on the cobra command in `cmd/rebase.go`
- Add `CommitterDateIsAuthorDate` to `cascadeRebaseOpts` and thread it
  to all `git.Rebase`/`git.RebaseOnto` calls in `cmd/utils.go`
- Persist the flag in `rebaseState` JSON so `--continue` resumes with
  the same behavior; pass it to `RebaseContinue` and subsequent cascade
  calls
- Update `internal/modify/apply.go` callers to pass zero-value
  `RebaseOpts{}`

Tests:
- Update all existing mock signatures in rebase, sync, and modify tests
- Add tests for flag passthrough, `--preserve-dates` alias, state
  round-trip, `--continue` flag restoration, and conflict state
  persistence

Docs:
- Update flag tables and examples in README.md and
  docs/src/content/docs/reference/cli.md

* clearer wording in docs and help text
2026-05-26 17:39:36 -04:00
Sameen Karim d3be1b577e prune merged branches (#94)
* prune merged branches

* interactively prompt for prune

* delete remote tracking ref too

* disable selecting merged branches in TUIs

* include full list (including merged PRs) in PUT request to stacks API

* add prune to docs

* addressing review comments

* increment skill file version
2026-05-15 14:01:04 -04:00
Sameen Karim d115ca0570 support multiple branches during init (#91)
* implicitly adopt branches in init

* deprecate adopt flag

* update docs

* address review comments
2026-05-15 14:01:03 -04:00
Sameen Karim 8cddfd4e21 Optimize view/modify TUI load time with parallel fetching (#79)
- Deduplicate API calls: syncStackPRs now returns PRDetails for
  LoadBranchNodes to reuse, eliminating redundant FindPRDetailsForBranch calls
- Parallelize API calls in syncStackPRs (capped at 6 concurrent requests)
- Parallelize git operations in LoadBranchNodes (capped at 4 concurrent)
- Show "Loading stack..." indicator for interactive sessions

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-05-11 11:09:32 -04:00
Sameen Karim 9d2c44263f Remove unused GraphQL fields to reduce API rate limit consumption (#78)
Audit all 7 GraphQL operations and remove fields that are fetched but
never used in Go code:

- Remove FindAnyPRForBranch: entire function is dead code (zero call sites)
- FindPRForBranch: remove title, state, headRefName, merged (4 fields)
- CreatePR: remove title, state, headRefName, baseRefName, isDraft (5 fields)
- FindPRDetailsForBranch: remove id, title, headRefName, baseRefName,
  comments { totalCount } (4 fields + 1 nested object)
- FindPRByNumber: remove title (1 field)

Also remove Title from PullRequest struct, and Title + CommentsCount
from PRDetails struct since they are no longer populated or read.

Total: ~15 unused fields removed across 5 queries, 1 dead query deleted,
and 1 unnecessary nested object (comments) eliminated.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-05-11 11:09:31 -04:00
Sameen Karim b71b10c268 use PR template when opening PRs (#77)
* use pr template when opening prs

* add a helper to clearly distinguish between filesystem errors and actual test failures
2026-05-11 11:09:31 -04:00
Sameen Karim 13330406ef open PRs as draft by default (#76)
* open prs as draft by default

* apply suggested docs updates from code review

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
2026-05-11 11:09:30 -04:00
Sameen Karim d1e9d14136 run fetch before push operations (#75)
* run fetch before push operations

* ignore if ref doesn't exist on remote

* rm fetch from link

* more durable fetch by trying all first and falling back to individual fetches

* run fetch before sync
2026-05-11 11:09:30 -04:00
Sameen Karim 7a268fc380 modify command (#72)
* git primitives for modify cmd

* extract reusable TUI parts

* modify cmd

* recreate stack after modify

* add checks to prevent other modifications while modify is applying

* modify continue for resuming after resolving conflicts

* fix bug with duplicate stack entries after modifying

* reuse conflict resolution help msg from rebase

* additional confirmation before overwriting stack on remote

* fix recreate order of operations

Co-authored-by: Copilot <copilot@github.com>

* move base commit instead of cherry picking for fold up

* check to ensure we aren't left with zero branches

* unify and dedupe across view and modify tui

* more detailed help instructions

Co-authored-by: Copilot <copilot@github.com>

* only recommend submit if stack exists on remote

Co-authored-by: Copilot <copilot@github.com>

* tests for modify tui, apply modifications, submit modifications

* refactor submit for regular and pending modifications

* rename recover to abort

Co-authored-by: Copilot <copilot@github.com>

* docs for modify cmd

* tui styling updates

* updated tui screenshot

* addressing review comments

* Fix 4 bugs from code review

Bug 1: Move RevParseMap error check before using originalRefs.
The error from git.RevParseMap() was deferred past iteration of
originalRefs, which could panic on a nil map.

Bug 2: Differentiate cherry-pick vs rebase conflicts in modify.
Cherry-pick conflicts don't save state as 'conflict' phase, so
--continue won't work. Now prints --abort-only instructions for
cherry-pick conflicts.

Bug 3: Unwind now cleans up branches created by renames.
After restoring snapshot branches, Unwind deletes renamed branch
names that don't belong to the original snapshot.

Bug 4: Simplify push message in submit command.
Changed from 'Pushing N branches to remote...' to 'Pushing to
remote...' since individual branches may fail.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix 7 nit issues from code review

11: Add named constants for phase strings (PhaseApplying, PhaseConflict,
PhasePendingSubmit) in state.go; replace remaining raw literals in
state.go CheckStateGuard.

14: Fix bottomLines comment mismatch — listed 3 items but value is 2.

15: Extract magic number 88 to MinWidthForArt constant in header.go.

16: Remove unused stackview import anchor in model.go — the import
is used via types.go where BranchNode is embedded.

17: Simplify CheckStackLinearity parent resolution — ActiveBaseBranch
already handles skipping merged branches.

18: Fix rename undo matching any rename — add NewName check so only
the specific rename being undone is matched.

20: Add TestUndoRename and TestUndoRename_DoesNotAffectOtherRenames
to validate rename undo behavior.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Make cherry-pick conflicts recoverable via --continue

Previously, cherry-pick conflicts during fold-down operations could only
be resolved with --abort. Now they save full conflict state (phase,
conflict type, fold branch/target, remaining branches) to the state file,
enabling recovery via 'gh stack modify --continue'.

Changes:
- Add ConflictType field to StateFile (rebase or cherry_pick)
- Add FoldBranch/FoldTarget fields for cherry-pick context
- Add CherryPickContinue to git package (cherry-pick --continue)
- Save cherry-pick conflict state in ApplyPlan with remaining branches
- ContinueApply handles both rebase and cherry-pick conflicts
- Unified conflict messaging in cmd/modify.go (both types show --continue)
- Updated test to verify cherry-pick conflict state is saved correctly

* Apply suggestions from code review

Co-authored-by: Luke Ghenco <lukeghenco@github.com>
Co-authored-by: Sameen Karim <skarim@github.com>

---------

Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Luke Ghenco <lukeghenco@github.com>
2026-05-04 22:34:42 -04:00
Copilot ad21053fe9 Guard GraphQL PR number conversion against int32 overflow (#56)
* Initial plan

* fix: validate int range before GraphQL Int conversion

Agent-Logs-Url: https://github.com/github/gh-stack/sessions/dbb2b50f-34fb-4957-ac08-e19c1f96ba41

Co-authored-by: skarim <1701557+skarim@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: skarim <1701557+skarim@users.noreply.github.com>
2026-04-23 12:21:43 -04:00
Sameen Karim 7af17b55dc switch command (#51)
* switch cmd to interactively switch to another branch in the stack

* add switch to docs

* addressing review comments

* bump skill file version

* default to current branch
2026-04-20 11:20:27 -04:00
Sameen Karim 42e43a47ae ignore stale merged/closed PRs for reused branch names (#49)
* ignore stale merged/closed PRs for reused branch names

* guard for edge case of deleted PR
2026-04-20 11:18:19 -04:00
Sameen Karim 8893d274f2 preflight check for stacked PR availability in submit (#44)
* preflight check for stacked prs before submit

* close pipe read end in test to avoid FD leak

* concise var reuse
2026-04-20 11:17:20 -04:00
Sameen Karim 22c8ef460b fix for rev-parse error during sync with deleted branches (#42)
* fix for rev-parse error during sync

* clearer info msg with rebasing over merged PRs
2026-04-20 11:14:50 -04:00
Sameen Karim 72b4dc563c fix for inflated diff counts when base branch has been updated since stack init (#39)
* fix for inflated diff counts when base branch has been updated since stack init
2026-04-20 11:09:45 -04:00
Sameen Karim b01754e4a9 Initial release 2026-04-10 03:32:08 -04:00