Add CvdMonitor command to monitor device logs.

This command repeatedly clears and prints the last 10 lines of
launcher.log, kernel.log, and logcat in a bordered ASCII box.
It includes unit tests for the display logic.

Assisted-by: Jetski
Bug: b/510094996

Author: Databean

base/cvd/cuttlefish/host/commands/cvd/cli/BUILD.bazel

@@ -99,6 +99,7 @@ cf_cc_library(
         "//cuttlefish/host/commands/cvd/cli/commands:lint",
         "//cuttlefish/host/commands/cvd/cli/commands:login",
         "//cuttlefish/host/commands/cvd/cli/commands:logs",
+        "//cuttlefish/host/commands/cvd/cli/commands:monitor",
         "//cuttlefish/host/commands/cvd/cli/commands:power_btn",
         "//cuttlefish/host/commands/cvd/cli/commands:powerwash",
         "//cuttlefish/host/commands/cvd/cli/commands:remove",

base/cvd/cuttlefish/host/commands/cvd/cli/commands/BUILD.bazel

@@ -1,4 +1,4 @@
-load("//cuttlefish/bazel:rules.bzl", "cf_cc_library")
+load("//cuttlefish/bazel:rules.bzl", "cf_cc_library", "cf_cc_test")
 
 package(
     default_visibility = ["//:android_cuttlefish"],
@@ -225,14 +225,35 @@ cf_cc_library(
 )
 
 cf_cc_library(
-    name = "power_btn",
-    srcs = ["power_btn.cpp"],
-    hdrs = ["power_btn.h"],
+    name = "logs",
+    srcs = ["logs.cpp"],
+    hdrs = ["logs.h"],
     deps = [
+        "//cuttlefish/common/libs/utils:files",
+        "//cuttlefish/common/libs/utils:flag_parser",
         "//cuttlefish/host/commands/cvd/cli:command_request",
         "//cuttlefish/host/commands/cvd/cli:types",
         "//cuttlefish/host/commands/cvd/cli/commands:command_handler",
         "//cuttlefish/host/commands/cvd/cli/selector",
+        "//cuttlefish/host/commands/cvd/instances:instance_manager",
+        "//cuttlefish/result",
+        "//libbase",
+        "@abseil-cpp//absl/log",
+    ],
+)
+
+cf_cc_library(
+    name = "monitor",
+    srcs = ["monitor.cpp"],
+    hdrs = ["monitor.h"],
+    deps = [
+        "//cuttlefish/common/libs/fs",
+        "//cuttlefish/common/libs/utils:flag_parser",
+        "//cuttlefish/host/commands/cvd/cli:command_request",
+        "//cuttlefish/host/commands/cvd/cli:types",
+        "//cuttlefish/host/commands/cvd/cli:utils",
+        "//cuttlefish/host/commands/cvd/cli/commands:command_handler",
+        "//cuttlefish/host/commands/cvd/cli/selector",
         "//cuttlefish/host/commands/cvd/instances",
         "//cuttlefish/host/commands/cvd/instances:instance_manager",
         "//cuttlefish/result",
@@ -241,12 +262,22 @@ cf_cc_library(
     ],
 )
 
+cf_cc_test(
+    name = "monitor_test",
+    srcs = ["monitor_test.cpp"],
+    deps = [
+        ":monitor",
+        "//cuttlefish/common/libs/fs",
+        "//cuttlefish/result:result_matchers",
+        "@abseil-cpp//absl/strings",
+    ],
+)
+
 cf_cc_library(
-    name = "powerwash",
-    srcs = ["powerwash.cpp"],
-    hdrs = ["powerwash.h"],
+    name = "power_btn",
+    srcs = ["power_btn.cpp"],
+    hdrs = ["power_btn.h"],
     deps = [
-        "//cuttlefish/common/libs/utils:flag_parser",
         "//cuttlefish/host/commands/cvd/cli:command_request",
         "//cuttlefish/host/commands/cvd/cli:types",
         "//cuttlefish/host/commands/cvd/cli/commands:command_handler",
@@ -260,9 +291,9 @@ cf_cc_library(
 )
 
 cf_cc_library(
-    name = "screen_recording",
-    srcs = ["screen_recording.cpp"],
-    hdrs = ["screen_recording.h"],
+    name = "powerwash",
+    srcs = ["powerwash.cpp"],
+    hdrs = ["powerwash.h"],
     deps = [
         "//cuttlefish/common/libs/utils:flag_parser",
         "//cuttlefish/host/commands/cvd/cli:command_request",
@@ -273,9 +304,7 @@ cf_cc_library(
         "//cuttlefish/host/commands/cvd/instances:instance_manager",
         "//cuttlefish/result",
         "//libbase",
-        "@abseil-cpp//absl/log",
         "@fmt",
-        "@jsoncpp",
     ],
 )
 
@@ -333,6 +362,26 @@ cf_cc_library(
     ],
 )
 
+cf_cc_library(
+    name = "screen_recording",
+    srcs = ["screen_recording.cpp"],
+    hdrs = ["screen_recording.h"],
+    deps = [
+        "//cuttlefish/common/libs/utils:flag_parser",
+        "//cuttlefish/host/commands/cvd/cli:command_request",
+        "//cuttlefish/host/commands/cvd/cli:types",
+        "//cuttlefish/host/commands/cvd/cli/commands:command_handler",
+        "//cuttlefish/host/commands/cvd/cli/selector",
+        "//cuttlefish/host/commands/cvd/instances",
+        "//cuttlefish/host/commands/cvd/instances:instance_manager",
+        "//cuttlefish/result",
+        "//libbase",
+        "@abseil-cpp//absl/log",
+        "@fmt",
+        "@jsoncpp",
+    ],
+)
+
 cf_cc_library(
     name = "snapshot",
     srcs = ["snapshot.cpp"],
@@ -453,21 +502,3 @@ cf_cc_library(
         "@jsoncpp",
     ],
 )
-
-cf_cc_library(
-    name = "logs",
-    srcs = ["logs.cpp"],
-    hdrs = ["logs.h"],
-    deps = [
-        "//cuttlefish/common/libs/utils:files",
-        "//cuttlefish/common/libs/utils:flag_parser",
-        "//cuttlefish/host/commands/cvd/cli:command_request",
-        "//cuttlefish/host/commands/cvd/cli:types",
-        "//cuttlefish/host/commands/cvd/cli/commands:command_handler",
-        "//cuttlefish/host/commands/cvd/cli/selector",
-        "//cuttlefish/host/commands/cvd/instances:instance_manager",
-        "//cuttlefish/result",
-        "//libbase",
-        "@abseil-cpp//absl/log",
-    ],
-)