io library

dart:io-backed execution environment for VM, desktop, and mobile.

Separate entry point so the core library (flutter_agent_harness.dart) stays pure Dart and web-compilable. Import this only from platform code that is allowed to touch dart:io.

Classes

CliConfig

Persisted CLI configuration.

IoLspTransport

An LspTransport over a spawned process's stdio.

LocalExecutionEnv

Local ExecutionEnv: LocalFileSystem plus LocalShell.

LocalFileSystem

Local-disk FileSystem backed by dart:io.

LocalShell

Minimal local shell backed by dart:io Process.

Sqlite3Engine

A SqliteEngine opening databases through package:sqlite3 (FFI).

Constants

headlessTextExtensions → const Set<String>

File extensions whose content is inlined as the headless prompt body.

Functions

homeDirectory() → String?

Returns the user's home directory, or null if it cannot be determined.

ioLspTransportFactory(LspServerConfig config, String cwd) → Future<LspTransport>

The process-capable LspTransportFactory for CLI/desktop hosts: spawns config.command config.args... in the workspace root.

loadCliConfig(String homeDir) → CliConfig

Loads CliConfig from ~/.fah/config.yaml.

loadPromptFile(String path, {required String homeDir, required String baseDir, required String source}) → String

Reads path as a prompt override file: YAML frontmatter is stripped (so the prompts/** Markdown sources can be copied verbatim as overrides) and the body is trimmed. A missing or unreadable file throws ConfigException prefixed with source — never a silent fallback.

loadPromptOverrideSource(String value, {required String homeDir, required String baseDir, required String source}) → String

Resolves one raw override value: a file path per looksLikePromptFilePath (read via loadPromptFile), anything else is inline text (trimmed).

looksLikePromptFilePath(String value) → bool

Whether a raw prompts: value names a file rather than inline text: an absolute path, a ~/ home-relative path, a .//../ relative path, or anything ending in a Markdown/text extension (.md, .markdown, .txt).

resolveHeadlessPrompt({String? prompt, List<String> positionals = const []}) → String?

Resolves the headless prompt from parsed CLI arguments.

resolvePromptFilePath(String path, {required String homeDir, required String baseDir}) → String

Expands a leading ~ to homeDir and resolves a relative path against baseDir.

resolvePromptOverrides(Map<String, String> raw, {required String homeDir, required String baseDir}) → PromptOverrides

Resolves the validated raw prompts: map (see parsePromptOverrideMap) into a PromptOverrides. Relative file paths resolve against baseDir (the CLI passes the agent cwd); the system alias canonicalizes to cli/mode_code. Missing files throw ConfigException.

saveCliConfig(String homeDir, CliConfig config) → Future<void>

Saves CliConfig to ~/.fah/config.yaml.