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v0.2.1
- Fix panic when sampling interval is set to 300s (NaN guard in Clamp01, fiveStopGradient, SpeedRatio) - Add display filter: press 'd' to cycle download-only / upload-only / both - Update demo.tape with display filter sequence - Regenerate and compress demo.gif with gifsicle Closes #27 Closes #28
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Lines changed: 84 additions & 19 deletions

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‎CHANGELOG.md‎

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@@ -1,3 +1,16 @@
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## [0.2.1] - 2026-07-23
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### Added
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- Display filter — Press `d` to cycle through download-only, upload-only, or both panels, allowing full focus on a single direction.
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- Footer indicator shows `[down only]` or `[up only]` when a filter is active.
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### Fixed
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- Panic when sampling interval was set to 300s — `Clamp01` now guards against NaN values, preventing `fiveStopGradient` from computing an out-of-range index with `int(NaN)`.
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- Added NaN/Inf guards in `SpeedRatio` and `fiveStopGradient` for defense-in-depth against floating-point edge cases.
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### Changed
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- VERSION bumped to 0.2.1.
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## [0.2.0] - 2026-07-15
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### Added

‎README.md‎

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@@ -132,14 +132,14 @@ flow --help
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### Keybindings
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| Key | Action | Key | Action |
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|---|---|---|---|
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|---|---|---|---|---|
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| `q` / `^C` | Quit | `c` | Cycle display units |
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| `m` | Cycle display modes | `b` | Toggle bits/bytes |
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| `n` | Network processes | `+` / `-` | Adjust refresh interval |
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| `t` | Choose theme | `p` | Pause / resume |
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| `i` | Cycle interfaces | `?` | Help |
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| `I` | Interface info | `esc` | Back / close overlay |
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| `r` | Reset peaks (press twice) | | |
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| `d` | Cycle display filter | `+` / `-` | Adjust refresh interval |
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| `n` | Network processes | `p` | Pause / resume |
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| `t` | Choose theme | `?` | Help |
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| `i` | Cycle interfaces | `esc` | Back / close overlay |
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| `I` | Interface info | `r` | Reset peaks (press twice) |
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### JSON output
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‎VERSION‎

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0.2.0
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0.2.1

‎assets/demo.gif‎

-727 KB
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‎cmd/flow/main.go‎

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@@ -16,7 +16,7 @@ import (
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"github.com/programmersd21/flow/internal/ui"
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)
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var version = "dev"
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var version = "0.2.1"
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func main() {
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flagTiny := flag.Bool("tiny", false, "single-line mode for tmux/status bars")

‎demo.tape‎

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Type "m"
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Sleep 600ms
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# Display filter — cycle through download-only → upload-only → both
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Type "d"
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Sleep 1s
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Type "d"
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Sleep 1s
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Type "d"
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Sleep 800ms
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# Bits + units
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Type "b"
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Sleep 600ms

‎internal/animate/ease.go‎

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@@ -20,7 +20,7 @@ func ColorLerp(r1, g1, b1, r2, g2, b2 uint8, t float64) (uint8, uint8, uint8) {
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}
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func Clamp01(t float64) float64 {
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if t < 0 {
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if t < 0 || math.IsNaN(t) {
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return 0
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}
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if t > 1 {

‎internal/theme/theme.go‎

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@@ -464,7 +464,7 @@ func fiveStopGradient(stops [5][3]uint8, t float64) (uint8, uint8, uint8) {
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t = animate.Clamp01(t)
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segment := t * 4.0
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idx := int(segment)
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if idx >= 4 {
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if idx >= 4 || idx < 0 {
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idx = 3
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segment = 4.0
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}
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}
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func SpeedRatio(current, rollingMax float64) float64 {
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if rollingMax <= 0 {
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if rollingMax <= 0 || math.IsNaN(rollingMax) || math.IsInf(rollingMax, 0) {
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return 0
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}
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return animate.Clamp01(current / rollingMax)

‎internal/ui/keys.go‎

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@@ -14,6 +14,7 @@ type KeyMap struct {
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Mode key.Binding
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Processes key.Binding
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Bits key.Binding
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Display key.Binding
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Faster key.Binding
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Slower key.Binding
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Themes key.Binding
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key.WithKeys("b"),
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key.WithHelp("b", "toggle bits/bytes"),
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),
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Display: key.NewBinding(
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key.WithKeys("d"),
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key.WithHelp("d", "cycle display filter"),
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),
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Faster: key.NewBinding(
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key.WithKeys("+", "="),
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key.WithHelp("+", "faster refresh"),

‎internal/ui/model.go‎

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@@ -33,6 +33,14 @@ type ifaceDetailMsg struct {
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err error
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}
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type DisplayFilter int
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const (
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DisplayBoth DisplayFilter = iota
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DisplayDownOnly
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DisplayUpOnly
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)
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const (
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slopeWindow = 6
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resetConfirmTimeout = 2 * time.Second
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unitMode UnitMode
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viewMode ViewMode
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bitsMode bool
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displayFilter DisplayFilter
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procs []processes.Info
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width, height int
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case key.Matches(msg, m.keys.Bits):
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m.bitsMode = !m.bitsMode
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case key.Matches(msg, m.keys.Display):
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m.displayFilter = (m.displayFilter + 1) % 3
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case key.Matches(msg, m.keys.Faster):
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m.adjustRefreshInterval(true)
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return m, waitForSample(m.smp.Out)

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