added initial script and readme

README.md

@@ -0,0 +1,85 @@
+# applog
+
+A shell script that wraps `idevicesyslog` to show clean, colorized log output for a specific iOS app. Cuts through the noise of the full system log and surfaces only lines relevant to your app or bundle ID.
+
+## Requirements
+
+### macOS
+
+```sh
+brew install usbmuxd libimobiledevice
+```
+
+| Package | Role |
+|---------|------|
+| `usbmuxd` | USB multiplexer daemon — manages the connection between the host and iOS devices over USB |
+| `libimobiledevice` | Provides `idevicesyslog` and other iOS communication tools |
+
+> On macOS, Apple ships its own `usbmuxd` as part of the OS. If `idevicesyslog` works without the brew version, you can skip `usbmuxd`.
+
+### Linux
+
+```sh
+# Debian/Ubuntu
+sudo apt install usbmuxd libimobiledevice-utils
+
+# Arch
+sudo pacman -S usbmuxd libimobiledevice
+```
+
+### iOS device setup
+
+1. **Trust the host machine** — connect the device, tap *Trust* on the prompt, and enter your passcode.
+2. **Enable Developer Mode** (iOS 16+) — Settings → Privacy & Security → Developer Mode. The device will reboot.
+3. **Pair the device** (if prompted):
+   ```sh
+   idevicepair pair
+   ```
+
+### Other
+
+- bash 3.2+
+- USB cable (wireless/Wi-Fi connections are not supported by `idevicesyslog`)
+
+## Usage
+
+```sh
+./applog.sh <bundle-id-prefix|process-name>
+```
+
+**Examples:**
+
+```sh
+./applog.sh com.mycompany.myapp
+./applog.sh MyApp
+```
+
+Press `Ctrl+C` to stop.
+
+## Output
+
+Each matched line is colorized by log level and separated by a visual rule:
+
+| Color  | Level |
+|--------|-------|
+| 🔴 Red    | `<Error>`, `<Fault>` |
+| 🟡 Yellow | `<Warning>` |
+| 🔵 Cyan   | `<Notice>` |
+| 🟢 Green  | `<Info>` |
+| Gray   | `<Debug>` |
+
+## How filtering works
+
+Lines are included if they contain the filter string anywhere — the app's own process logs, plus system services acting on its behalf (network, Bluetooth, etc.).
+
+A blocklist of known noisy system daemons (`runningboardd`, `tccd`, `launchd`, and others) is excluded even when they reference your bundle ID, since those lines reflect system bookkeeping rather than app behavior.
+
+To suppress additional processes, add them to `BLOCKLIST_RE` near the top of the script.
+
+## Installation
+
+```sh
+chmod +x applog.sh
+# optionally move somewhere on your PATH
+cp applog.sh /usr/local/bin/applog
+```

applog.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+
+FILTER="$1"
+
+if [[ -z "$FILTER" ]]; then
+    echo "Usage: $(basename "$0") <bundle-id-prefix|process-name>"
+    echo ""
+    echo "  Examples:"
+    echo "    $(basename "$0") com.mycompany.myapp"
+    echo "    $(basename "$0") MyApp"
+    exit 1
+fi
+
+RED=$'\033[0;31m'
+YELLOW=$'\033[0;33m'
+CYAN=$'\033[0;36m'
+GREEN=$'\033[0;32m'
+DIM=$'\033[2m'
+RESET=$'\033[0m'
+
+SEP="${DIM}────────────────────────────────────────${RESET}"
+
+cleanup() {
+    printf "\n%s[applog] Stopped.%s\n" "$DIM" "$RESET"
+    exit 0
+}
+
+trap cleanup SIGINT SIGTERM
+
+printf "%s[applog] Filtering for '%s'. Ctrl+C to stop.%s\n\n" "$DIM" "$FILTER" "$RESET"
+
+# System daemons that reference app bundle IDs as incidental observers, not direct participants
+BLOCKLIST_RE='^(runningboardd|lsd|trustd|aggregated|tccd|dasd|symptomsd|swcd|calaccessd|mobileassetd|fairplayd|statusbarserver|contextstore|assertiond|thermalmonitord|watchdogd|powerd|logd|notifyd|configd|launchd|mDNSResponder)$'
+
+idevicesyslog 2>/dev/null | while IFS= read -r line; do
+    [[ "$line" != *"$FILTER"* ]] && continue
+
+    # Extract process name (stop at '(' or '[' — handles both "proc[sub][pid]" and "proc(sub)[pid]")
+    # idevicesyslog format: "Mon DD HH:MM:SS.ssssss processname(subsystem)[pid] <Level>: msg"
+    if [[ "$line" =~ ^[A-Za-z]{3}[[:space:]]+[0-9]+[[:space:]]+[0-9:.]+[[:space:]]+([^[:space:]\[\(]+) ]]; then
+        [[ "${BASH_REMATCH[1]}" =~ $BLOCKLIST_RE ]] && continue
+    fi
+
+    # Colorize by <Level>: field; show all lines regardless of level
+    if [[ "$line" =~ \<(Error|ERROR|Fault|FAULT)\>: ]]; then
+        printf "%s%s%s\n%s\n" "$RED" "$line" "$RESET" "$SEP"
+    elif [[ "$line" =~ \<(Warning|WARNING)\>: ]]; then
+        printf "%s%s%s\n%s\n" "$YELLOW" "$line" "$RESET" "$SEP"
+    elif [[ "$line" =~ \<(Notice)\>: ]]; then
+        printf "%s%s%s\n%s\n" "$CYAN" "$line" "$RESET" "$SEP"
+    elif [[ "$line" =~ \<(Info)\>: ]]; then
+        printf "%s%s%s\n%s\n" "$GREEN" "$line" "$RESET" "$SEP"
+    elif [[ "$line" =~ \<(Debug)\>: ]]; then
+        printf "%s%s%s\n%s\n" "$DIM" "$line" "$RESET" "$SEP"
+    else
+        printf "%s\n%s\n" "$line" "$SEP"
+    fi
+done