Publish 0.023 alpha so inch fields take fractions and the scales read out on the car setup.

app/build.gradle.kts

@@ -13,8 +13,11 @@ android {
         applicationId = "com.racingapp.pitlog"
         minSdk = 26
         targetSdk = 36
-        versionCode = 3
-        versionName = "0.003"
+        // Three digits. versionCode is that number with the dot removed.
+        // A fix adds 0.001. One feature adds 0.010. A batch of features adds 0.100.
+        // The release tag is v plus versionName, such as v0.013.
+        versionCode = 23
+        versionName = "0.023"
     }
 
     buildTypes {

app/src/main/java/com/racingapp/pitlog/model/Parsing.kt

@@ -1,6 +1,8 @@
 package com.racingapp.pitlog.model
 
 import java.util.Locale
+import kotlin.math.abs
+import kotlin.math.roundToInt
 
 fun sanitizeSignedDecimal(raw: String, wholeDigits: Int, fractionDigits: Int): String {
     val negative = raw.trimStart().startsWith('-')
@@ -31,6 +33,72 @@ fun parseDecimal(raw: String): Double? {
     return trimmed.toDoubleOrNull()
 }
 
+fun sanitizeInches(raw: String, signed: Boolean = false): String {
+    val negative = signed && raw.trimStart().startsWith('-')
+    val source = raw.trim().removePrefix("-").removePrefix("+").replace(',', '.')
+    val out = StringBuilder()
+    var slash = false
+    var dot = false
+    var space = false
+    var digits = 0
+    for (ch in source) {
+        when {
+            ch.isDigit() -> {
+                val limit = when {
+                    slash || dot -> if (dot) 4 else 2
+                    else -> 2
+                }
+                if (digits < limit) {
+                    out.append(ch)
+                    digits++
+                }
+            }
+            ch == '/' && !slash && !dot && out.isNotEmpty() && !out.endsWith(' ') -> {
+                slash = true
+                digits = 0
+                out.append('/')
+            }
+            ch == '.' && !dot && !slash && !space -> {
+                dot = true
+                digits = 0
+                out.append('.')
+            }
+            ch == ' ' && !space && !slash && !dot && digits > 0 -> {
+                space = true
+                digits = 0
+                out.append(' ')
+            }
+        }
+    }
+    val text = out.toString()
+    if (text.isEmpty()) return if (negative) "-" else ""
+    return if (negative) "-$text" else text
+}
+
+fun parseInches(raw: String): Double? {
+    val trimmed = raw.trim().removeSuffix(" ")
+    if (trimmed.isEmpty() || trimmed == "-" || trimmed.endsWith("/") || trimmed.endsWith(".")) return null
+    val negative = trimmed.startsWith("-")
+    val body = trimmed.removePrefix("-").trim()
+    val value = if (body.contains("/")) parseFraction(body) else parseDecimal(body)
+    value ?: return null
+    return if (negative) -value else value
+}
+
+fun formatInches(value: Double?): String {
+    if (value == null) return ""
+    val negative = value < 0
+    val magnitude = abs(value)
+    val scaled = magnitude * 64.0
+    val nearest = scaled.roundToInt()
+    val body = if (abs(scaled - nearest) <= 0.04) {
+        fractionInches(nearest)
+    } else {
+        String.format(Locale.US, "%.3f", magnitude).trimEnd('0').trimEnd('.')
+    }
+    return if (negative && body != "0") "-$body" else body
+}
+
 fun parseIntField(raw: String): Int? = raw.trim().toIntOrNull()
 
 fun formatPsi(value: Double?): String =
@@ -52,15 +120,48 @@ fun formatDegrees(value: Double?): String =
 
 fun formatStagger(value: Double?): String {
     if (value == null) return "—"
-    return String.format(Locale.US, "%.2f", value).trimEnd('0').trimEnd('.')
+    return formatInches(value)
 }
 
 fun psiField(value: Double?): String =
     if (value == null) "" else String.format(Locale.US, "%.1f", value)
 
-fun staggerField(value: Double?): String {
-    if (value == null) return ""
-    return String.format(Locale.US, "%.2f", value).trimEnd('0').trimEnd('.')
+fun staggerField(value: Double?): String = formatInches(value)
+
+private fun parseFraction(body: String): Double? {
+    val parts = body.split(' ').filter { it.isNotEmpty() }
+    val whole: Double
+    val token: String
+    when (parts.size) {
+        1 -> {
+            whole = 0.0
+            token = parts[0]
+        }
+        2 -> {
+            whole = parts[0].toDoubleOrNull() ?: return null
+            token = parts[1]
+        }
+        else -> return null
+    }
+    val bits = token.split('/')
+    if (bits.size != 2 || bits[1].isEmpty()) return null
+    val numerator = bits[0].toDoubleOrNull() ?: return null
+    val denominator = bits[1].toDoubleOrNull() ?: return null
+    if (denominator == 0.0) return null
+    return whole + numerator / denominator
+}
+
+private fun fractionInches(sixtyFourths: Int): String {
+    val whole = sixtyFourths / 64
+    var numerator = sixtyFourths % 64
+    var denominator = 64
+    if (numerator == 0) return whole.toString()
+    while (numerator % 2 == 0) {
+        numerator /= 2
+        denominator /= 2
+    }
+    val fraction = "$numerator/$denominator"
+    return if (whole == 0) fraction else "$whole $fraction"
 }
 
 fun intField(value: Int?): String = value?.toString().orEmpty()

app/src/main/java/com/racingapp/pitlog/model/RunForm.kt

@@ -123,7 +123,7 @@ data class RunForm(
         if (sheet.cold.any() || sheet.hot.any()) return true
         if (sheet.heat.values.any { it.any() }) return true
         if (parseIntField(laps) != null || parseIntField(finish) != null) return true
-        if (parseDecimal(stagger) != null) return true
+        if (parseInches(stagger) != null) return true
         if (tireSet.isNotBlank() || notes.isNotBlank()) return true
         return handling != null || handlingWhere != null
     }
@@ -137,7 +137,7 @@ data class RunForm(
             tireSet = tireSet.trim(),
             laps = parseIntField(laps),
             finish = parseIntField(finish),
-            staggerInches = parseDecimal(stagger),
+            staggerInches = parseInches(stagger),
             coldLf = sheet.cold.lf,
             coldRf = sheet.cold.rf,
             coldLr = sheet.cold.lr,

app/src/main/java/com/racingapp/pitlog/model/SetupLog.kt

@@ -28,22 +28,61 @@ fun setupLines(sheet: SetupSheet): List<String> = buildList {
         "RR" to sheet.weightRr,
     ).mapNotNull { (corner, pounds) -> pounds?.let { "$corner $it" } }
     if (weights.isNotEmpty()) add("Weights ${weights.joinToString("  ")} lb")
-    weightSplit(sheet.weightLf, sheet.weightRf, sheet.weightLr, sheet.weightRr)?.let { add("From the weights  $it") }
+    addAll(scaleLines(sheet.weightLf, sheet.weightRf, sheet.weightLr, sheet.weightRr))
     sheet.rideHeight?.let { add("Ride height ${inches(it)} in") }
     sheet.pinion?.let { add("Pinion ${formatDegrees(it)}°") }
     sheet.brakeFront?.let { add("Front brake ${onePlace(it)}%") }
 }
 
-fun weightSplit(lf: Int?, rf: Int?, lr: Int?, rr: Int?): String? {
+fun scaleLines(lf: Int?, rf: Int?, lr: Int?, rr: Int?): List<String> {
+    val reading = scaleReading(lf, rf, lr, rr) ?: return emptyList()
+    return listOf(
+        "Total ${reading.total} lb",
+        "Left ${pair(reading.left, reading.leftPercent)}",
+        "Front ${pair(reading.front, reading.frontPercent)}",
+        "Rear ${pair(reading.rear, reading.rearPercent)}",
+        "Cross ${pair(reading.cross, reading.crossPercent)}",
+        "Rear bite ${reading.rearBite}",
+    )
+}
+
+private data class ScaleReading(
+    val total: Int,
+    val left: Int,
+    val leftPercent: Double,
+    val front: Int,
+    val frontPercent: Double,
+    val rear: Int,
+    val rearPercent: Double,
+    val cross: Int,
+    val crossPercent: Double,
+    val rearBite: Int,
+)
+
+private fun scaleReading(lf: Int?, rf: Int?, lr: Int?, rr: Int?): ScaleReading? {
     if (lf == null || rf == null || lr == null || rr == null) return null
     val total = lf + rf + lr + rr
     if (total <= 0) return null
-    val left = (lf + lr) * 100.0 / total
-    val rear = (lr + rr) * 100.0 / total
-    val cross = (rf + lr) * 100.0 / total
-    return "Left ${onePlace(left)}%  Rear ${onePlace(rear)}%  Cross ${onePlace(cross)}%"
+    val left = lf + lr
+    val front = lf + rf
+    val rear = lr + rr
+    val cross = rf + lr
+    return ScaleReading(
+        total = total,
+        left = left,
+        leftPercent = left * 100.0 / total,
+        front = front,
+        frontPercent = front * 100.0 / total,
+        rear = rear,
+        rearPercent = rear * 100.0 / total,
+        cross = cross,
+        crossPercent = cross * 100.0 / total,
+        rearBite = lr - rr,
+    )
 }
 
+private fun pair(pounds: Int, percent: Double) = "$pounds lb, ${onePlace(percent)}%"
+
 fun setupDiffs(before: SetupSheet, after: SetupSheet): List<String> = buildList {
     changed(before.crossPercent, after.crossPercent, ::percent)?.let { add("Cross $it") }
     changedInt(before.springLf, after.springLf, " lb")?.let { add("LF spring $it") }
@@ -63,18 +102,40 @@ fun setupDiffs(before: SetupSheet, after: SetupSheet): List<String> = buildList
     changedInt(before.weightRf, after.weightRf, " lb")?.let { add("RF weight $it") }
     changedInt(before.weightLr, after.weightLr, " lb")?.let { add("LR weight $it") }
     changedInt(before.weightRr, after.weightRr, " lb")?.let { add("RR weight $it") }
+    addAll(scaleChanges(before, after))
     changed(before.rideHeight, after.rideHeight) { "${inches(it)} in" }?.let { add("Ride height $it") }
     changed(before.pinion, after.pinion) { "${formatDegrees(it)}°" }?.let { add("Pinion $it") }
     changed(before.brakeFront, after.brakeFront) { "${onePlace(it)}%" }?.let { add("Front brake $it") }
 }
 
+private fun scaleChanges(before: SetupSheet, after: SetupSheet): List<String> {
+    val old = scaleReading(before.weightLf, before.weightRf, before.weightLr, before.weightRr)
+    val next = scaleReading(after.weightLf, after.weightRf, after.weightLr, after.weightRr)
+    if (old == null || next == null || old == next) return emptyList()
+    return buildList {
+        if (old.total != next.total) add("Total ${old.total} lb → ${next.total} lb")
+        if (old.left != next.left || onePlace(old.leftPercent) != onePlace(next.leftPercent)) {
+            add("Left ${pair(old.left, old.leftPercent)} → ${pair(next.left, next.leftPercent)}")
+        }
+        if (old.front != next.front || onePlace(old.frontPercent) != onePlace(next.frontPercent)) {
+            add("Front ${pair(old.front, old.frontPercent)} → ${pair(next.front, next.frontPercent)}")
+        }
+        if (old.rear != next.rear || onePlace(old.rearPercent) != onePlace(next.rearPercent)) {
+            add("Rear ${pair(old.rear, old.rearPercent)} → ${pair(next.rear, next.rearPercent)}")
+        }
+        if (old.cross != next.cross || onePlace(old.crossPercent) != onePlace(next.crossPercent)) {
+            add("Cross ${pair(old.cross, old.crossPercent)} → ${pair(next.cross, next.crossPercent)}")
+        }
+        if (old.rearBite != next.rearBite) add("Rear bite ${old.rearBite} → ${next.rearBite}")
+    }
+}
+
 private fun percent(value: Double): String = String.format(Locale.US, "%.1f%%", value)
 
 private fun onePlace(value: Double): String =
     String.format(Locale.US, "%.1f", value).trimEnd('0').trimEnd('.')
 
-private fun inches(value: Double): String =
-    String.format(Locale.US, "%.3f", value).trimEnd('0').trimEnd('.')
+private fun inches(value: Double): String = formatInches(value)
 
 private fun changed(
     before: Double?,

app/src/main/java/com/racingapp/pitlog/ui/Fields.kt

@@ -94,14 +94,22 @@ fun NumberField(
     onValue: (String) -> Unit,
     modifier: Modifier = Modifier,
     decimal: Boolean = true,
+    inches: Boolean = false,
+    placeholder: String = "",
 ) {
     OutlinedTextField(
         value = value,
         onValueChange = onValue,
         label = { Text(label) },
+        placeholder = if (placeholder.isEmpty()) null else ({ Text(placeholder) }),
         singleLine = true,
         keyboardOptions = KeyboardOptions(
-            keyboardType = if (decimal) KeyboardType.Decimal else KeyboardType.Number,
+            capitalization = KeyboardCapitalization.None,
+            keyboardType = when {
+                inches -> KeyboardType.Uri
+                decimal -> KeyboardType.Decimal
+                else -> KeyboardType.Number
+            },
         ),
         textStyle = MaterialTheme.typography.titleMedium.copy(fontWeight = FontWeight.SemiBold),
         modifier = modifier,

app/src/main/java/com/racingapp/pitlog/ui/night/NightDetailScreen.kt

@@ -49,6 +49,7 @@ import com.racingapp.pitlog.model.exportFileName
 import com.racingapp.pitlog.model.chassisSetup
 import com.racingapp.pitlog.model.chassisTips
 import com.racingapp.pitlog.model.formatDegrees
+import com.racingapp.pitlog.model.formatInches
 import com.racingapp.pitlog.model.formatPsi
 import com.racingapp.pitlog.model.formatStagger
 import com.racingapp.pitlog.model.handlingText
@@ -237,8 +238,8 @@ private fun SetupBlock(night: RaceNight, latest: RunLog?, onSetup: () -> Unit) {
             SetupLine(
                 "Blocks",
                 listOf(
-                    night.blockLr?.let { "LR ${String.format(java.util.Locale.US, "%.1f", it)} in" },
-                    night.blockRr?.let { "RR ${String.format(java.util.Locale.US, "%.1f", it)} in" },
+                    night.blockLr?.let { "LR ${formatInches(it)} in" },
+                    night.blockRr?.let { "RR ${formatInches(it)} in" },
                 ).filterNotNull().joinToString("  ").ifBlank { null },
             )
             SetupLine(

app/src/main/java/com/racingapp/pitlog/ui/night/SetupEditorScreen.kt

@@ -31,9 +31,12 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.racingapp.pitlog.data.RaceNight
 import com.racingapp.pitlog.data.Repository
+import com.racingapp.pitlog.model.formatInches
 import com.racingapp.pitlog.model.parseDecimal
+import com.racingapp.pitlog.model.parseInches
 import com.racingapp.pitlog.model.parseIntField
 import com.racingapp.pitlog.model.sanitizeDecimal
+import com.racingapp.pitlog.model.sanitizeInches
 import com.racingapp.pitlog.model.sanitizeInt
 import com.racingapp.pitlog.model.sanitizeSignedDecimal
 import com.racingapp.pitlog.ui.FieldRow
@@ -71,8 +74,8 @@ private data class SetupForm(
         casterLf = parseDecimal(casterLf),
         casterRf = parseDecimal(casterRf),
         swayBarHole = parseIntField(swayBarHole),
-        blockLr = parseDecimal(blockLr),
-        blockRr = parseDecimal(blockRr),
+        blockLr = parseInches(blockLr),
+        blockRr = parseInches(blockRr),
     )
 
     companion object {
@@ -87,8 +90,8 @@ private data class SetupForm(
             casterLf = signedField(night.casterLf),
             casterRf = signedField(night.casterRf),
             swayBarHole = night.swayBarHole?.toString().orEmpty(),
-            blockLr = night.blockLr?.let { String.format(Locale.US, "%.1f", it) }.orEmpty(),
-            blockRr = night.blockRr?.let { String.format(Locale.US, "%.1f", it) }.orEmpty(),
+            blockLr = formatInches(night.blockLr),
+            blockRr = formatInches(night.blockRr),
         )
     }
 }
@@ -254,16 +257,20 @@ fun SetupEditorScreen(nightId: Long, onBack: () -> Unit) {
                             label = "LR",
                             value = form.blockLr,
                             onValue = { value ->
-                                viewModel.update { it.copy(blockLr = sanitizeDecimal(value, 1, 1)) }
+                                viewModel.update { it.copy(blockLr = sanitizeInches(value)) }
                             },
+                            inches = true,
+                            placeholder = "1/2",
                             modifier = Modifier.weight(1f),
                         )
                         NumberField(
                             label = "RR",
                             value = form.blockRr,
                             onValue = { value ->
-                                viewModel.update { it.copy(blockRr = sanitizeDecimal(value, 1, 1)) }
+                                viewModel.update { it.copy(blockRr = sanitizeInches(value)) }
                             },
+                            inches = true,
+                            placeholder = "1/2",
                             modifier = Modifier.weight(1f),
                         )
                     }

app/src/main/java/com/racingapp/pitlog/ui/run/RunEditorScreen.kt

@@ -52,6 +52,7 @@ import com.racingapp.pitlog.model.Tread
 import com.racingapp.pitlog.model.formatPsi
 import com.racingapp.pitlog.model.hasColdPressure
 import com.racingapp.pitlog.model.sanitizeDecimal
+import com.racingapp.pitlog.model.sanitizeInches
 import com.racingapp.pitlog.model.sanitizeInt
 import com.racingapp.pitlog.model.suspiciousReadings
 import com.racingapp.pitlog.model.toSheet
@@ -261,8 +262,10 @@ fun RunEditorScreen(
                             label = "Stagger",
                             value = form.stagger,
                             onValue = { value ->
-                                viewModel.update { it.copy(stagger = sanitizeDecimal(value, 2, 2)) }
+                                viewModel.update { it.copy(stagger = sanitizeInches(value)) }
                             },
+                            inches = true,
+                            placeholder = "1/8",
                             modifier = Modifier.weight(1f),
                         )
                     }

app/src/main/java/com/racingapp/pitlog/ui/setup/CarSetupEditorScreen.kt

@@ -32,13 +32,16 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.racingapp.pitlog.data.Repository
 import com.racingapp.pitlog.data.SetupSheet
+import com.racingapp.pitlog.model.formatInches
 import com.racingapp.pitlog.model.parseDecimal
+import com.racingapp.pitlog.model.parseInches
 import com.racingapp.pitlog.model.parseIntField
 import com.racingapp.pitlog.model.sanitizeDecimal
+import com.racingapp.pitlog.model.sanitizeInches
 import com.racingapp.pitlog.model.sanitizeInt
 import com.racingapp.pitlog.model.sanitizeSignedDecimal
+import com.racingapp.pitlog.model.scaleLines
 import com.racingapp.pitlog.model.setupDiffs
-import com.racingapp.pitlog.model.weightSplit
 import com.racingapp.pitlog.ui.FieldRow
 import com.racingapp.pitlog.ui.NumberField
 import com.racingapp.pitlog.ui.PitActionButton
@@ -88,15 +91,15 @@ private data class CarSetupForm(
         casterLf = parseDecimal(casterLf),
         casterRf = parseDecimal(casterRf),
         swayBarHole = parseIntField(swayBarHole),
-        blockLr = parseDecimal(blockLr),
-        blockRr = parseDecimal(blockRr),
-        toeFront = parseDecimal(toeFront),
-        toeRear = parseDecimal(toeRear),
+        blockLr = parseInches(blockLr),
+        blockRr = parseInches(blockRr),
+        toeFront = parseInches(toeFront),
+        toeRear = parseInches(toeRear),
         weightLf = parseIntField(weightLf),
         weightRf = parseIntField(weightRf),
         weightLr = parseIntField(weightLr),
         weightRr = parseIntField(weightRr),
-        rideHeight = parseDecimal(rideHeight),
+        rideHeight = parseInches(rideHeight),
         pinion = parseDecimal(pinion),
         brakeFront = parseDecimal(brakeFront),
     )
@@ -113,15 +116,15 @@ private data class CarSetupForm(
             casterLf = decimal(sheet.casterLf, 1),
             casterRf = decimal(sheet.casterRf, 1),
             swayBarHole = sheet.swayBarHole?.toString().orEmpty(),
-            blockLr = decimal(sheet.blockLr, 1),
-            blockRr = decimal(sheet.blockRr, 1),
-            toeFront = decimal(sheet.toeFront, 3),
-            toeRear = decimal(sheet.toeRear, 3),
+            blockLr = formatInches(sheet.blockLr),
+            blockRr = formatInches(sheet.blockRr),
+            toeFront = formatInches(sheet.toeFront),
+            toeRear = formatInches(sheet.toeRear),
             weightLf = sheet.weightLf?.toString().orEmpty(),
             weightRf = sheet.weightRf?.toString().orEmpty(),
             weightLr = sheet.weightLr?.toString().orEmpty(),
             weightRr = sheet.weightRr?.toString().orEmpty(),
-            rideHeight = decimal(sheet.rideHeight, 1),
+            rideHeight = formatInches(sheet.rideHeight),
             pinion = decimal(sheet.pinion, 1),
             brakeFront = decimal(sheet.brakeFront, 1),
             note = if (keepNote) sheet.note else "",
@@ -320,13 +323,17 @@ fun CarSetupEditorScreen(
                         NumberField(
                             label = "LR",
                             value = form.blockLr,
-                            onValue = { value -> viewModel.update { it.copy(blockLr = sanitizeDecimal(value, 1, 1)) } },
+                            onValue = { value -> viewModel.update { it.copy(blockLr = sanitizeInches(value)) } },
+                            inches = true,
+                            placeholder = "1/2",
                             modifier = Modifier.weight(1f),
                         )
                         NumberField(
                             label = "RR",
                             value = form.blockRr,
-                            onValue = { value -> viewModel.update { it.copy(blockRr = sanitizeDecimal(value, 1, 1)) } },
+                            onValue = { value -> viewModel.update { it.copy(blockRr = sanitizeInches(value)) } },
+                            inches = true,
+                            placeholder = "1/2",
                             modifier = Modifier.weight(1f),
                         )
                     }
@@ -354,12 +361,12 @@ fun CarSetupEditorScreen(
                         color = MaterialTheme.colorScheme.onSurfaceVariant,
                     )
                     FieldRow {
-                        SignedField("Front", form.toeFront, { value -> viewModel.update { it.copy(toeFront = value) } }, Modifier.weight(1f), 1, 3)
-                        SignedField("Rear", form.toeRear, { value -> viewModel.update { it.copy(toeRear = value) } }, Modifier.weight(1f), 1, 3)
+                        SignedField("Front", form.toeFront, { value -> viewModel.update { it.copy(toeFront = value) } }, Modifier.weight(1f), inches = true)
+                        SignedField("Rear", form.toeRear, { value -> viewModel.update { it.copy(toeRear = value) } }, Modifier.weight(1f), inches = true)
                     }
                     SectionLabel("Corner weights, lb")
                     Text(
-                        "Pounds on the pads. Left, rear, and cross are figured from these four.",
+                        "Pounds on the pads. Left, front, rear, and cross come out in pounds and percent. Rear bite is left rear minus right rear.",
                         color = MaterialTheme.colorScheme.onSurfaceVariant,
                     )
                     FieldRow {
@@ -394,13 +401,13 @@ fun CarSetupEditorScreen(
                             modifier = Modifier.weight(1f),
                         )
                     }
-                    weightSplit(
+                    scaleLines(
                         form.weightLf.toIntOrNull(),
                         form.weightRf.toIntOrNull(),
                         form.weightLr.toIntOrNull(),
                         form.weightRr.toIntOrNull(),
-                    )?.let { split ->
-                        Text(split, modifier = Modifier.padding(top = 8.dp))
+                    ).forEach { line ->
+                        Text(line, modifier = Modifier.padding(top = 8.dp))
                     }
                     SectionLabel("Ride height")
                     Text(
@@ -410,7 +417,9 @@ fun CarSetupEditorScreen(
                     NumberField(
                         label = "Inches",
                         value = form.rideHeight,
-                        onValue = { value -> viewModel.update { it.copy(rideHeight = sanitizeDecimal(value, 2, 1)) } },
+                        onValue = { value -> viewModel.update { it.copy(rideHeight = sanitizeInches(value)) } },
+                        inches = true,
+                        placeholder = "5",
                         modifier = Modifier.fillMaxWidth(),
                     )
                     SectionLabel("Pinion")
@@ -457,6 +466,7 @@ private fun SignedField(
     value: String,
     onValue: (String) -> Unit,
     modifier: Modifier = Modifier,
+    inches: Boolean = false,
     wholeDigits: Int = 2,
     fractionDigits: Int = 1,
 ) {
@@ -464,7 +474,14 @@ private fun SignedField(
         NumberField(
             label = label,
             value = value,
-            onValue = { onValue(sanitizeSignedDecimal(it, wholeDigits, fractionDigits)) },
+            onValue = {
+                onValue(
+                    if (inches) sanitizeInches(it, signed = true)
+                    else sanitizeSignedDecimal(it, wholeDigits, fractionDigits),
+                )
+            },
+            inches = inches,
+            placeholder = if (inches) "1/16" else "",
             modifier = Modifier.fillMaxWidth(),
         )
         TextButton(

app/src/test/java/com/racingapp/pitlog/model/InchesTest.kt

@@ -0,0 +1,31 @@
+package com.racingapp.pitlog.model
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Test
+
+class InchesTest {
+    @Test
+    fun aFractionParsesAndComesBackAsAFraction() {
+        assertEquals(0.0625, parseInches("1/16")!!, 0.00001)
+        assertEquals(0.125, parseInches("1/8")!!, 0.00001)
+        assertEquals(2.5, parseInches("2 1/2")!!, 0.00001)
+        assertEquals(-0.0625, parseInches("-1/16")!!, 0.00001)
+        assertEquals(1.125, parseInches("1.125")!!, 0.00001)
+        assertEquals("1/16", formatInches(parseInches("1/16")))
+        assertEquals("1/8", formatInches(parseInches("1/8")))
+        assertEquals("2 1/2", formatInches(parseInches("2 1/2")))
+        assertEquals("-1/16", formatInches(parseInches("-1/16")))
+        assertEquals("1 1/8", formatInches(1.125))
+    }
+
+    @Test
+    fun typingKeepsTheSlashUntilTheFractionIsFinished() {
+        assertEquals("1/16", sanitizeInches("1/16"))
+        assertEquals("1/", sanitizeInches("1/"))
+        assertEquals("2 1/2", sanitizeInches("2 1/2"))
+        assertEquals("-1/8", sanitizeInches("-1/8", signed = true))
+        assertNull(parseInches("1/"))
+        assertNull(parseInches("1/0"))
+    }
+}

app/src/test/java/com/racingapp/pitlog/model/SetupLogTest.kt

@@ -23,7 +23,7 @@ class SetupLogTest {
             listOf(
                 "RF spring 1000 lb → 1050 lb",
                 "Sway bar Setting 4 → Setting 3",
-                "Front toe 0.125 in → 0.063 in",
+                "Front toe 1/8 in → 1/16 in",
             ),
             setupDiffs(original, later),
         )
@@ -56,7 +56,12 @@ class SetupLogTest {
         assertEquals(
             listOf(
                 "Weights LF 800  RF 760  LR 740  RR 700 lb",
-                "From the weights  Left 51.3%  Rear 48%  Cross 50%",
+                "Total 3000 lb",
+                "Left 1540 lb, 51.3%",
+                "Front 1560 lb, 52%",
+                "Rear 1440 lb, 48%",
+                "Cross 1500 lb, 50%",
+                "Rear bite 40",
                 "Ride height 5 in",
                 "Pinion -2.0°",
                 "Front brake 62%",
@@ -66,6 +71,11 @@ class SetupLogTest {
         assertEquals(
             listOf(
                 "LF weight 800 lb → 820 lb",
+                "Total 3000 lb → 3020 lb",
+                "Left 1540 lb, 51.3% → 1560 lb, 51.7%",
+                "Front 1560 lb, 52% → 1580 lb, 52.3%",
+                "Rear 1440 lb, 48% → 1440 lb, 47.7%",
+                "Cross 1500 lb, 50% → 1500 lb, 49.7%",
                 "Ride height 5 in → 5.2 in",
                 "Pinion -2.0° → -1.5°",
                 "Front brake 62% → 65%",