mirror of
https://github.com/ByteWelder/Tactility.git
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79d3dd4fdb
app-module - Apps now have support for: - environment variables (inherit from parent app) - current workdir - window size (when running in terminal) - Add type aliases like `AppId` and `PackageId` - Remove data duplication between ledger and app instance records: create `AppManifestSet` - `AppManifest` usage safety improved: pass by value where needed, or use `AppId` instead of a manifest. Terminal and shell - Moved shell commands into coreutils-module as proper apps. - Refine stack size for terminal and shell because apps now run with their own task and stack (including in-memory apps) Platform - Fix for listing root dir on ESP32: wrap posix directory functions and wire in file systems. - Moved all platform-specific file system init code to platform subprojects Other - Fix for screenshot capture (issue with paths) - Fixes for coreutils app correctness - Memory optimizations (use more PSRAM where possible) in various locations such as app-module, shell and terminal. - `ls` and `help` commands now use terminal width and show columns of data by default - Created fs helpers at `TactilityKernel/include/tactility/filesystem/fs.h` (partially ported from `ShellFs`)
74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
#include <coreutils/command_support.h>
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#include <app/manifest.h>
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#include <cstdio>
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namespace {
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struct HeadState {
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int remaining;
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bool atLineStart;
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};
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bool emitHeadChunk(const char* data, size_t length, void* context) {
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auto* state = static_cast<HeadState*>(context);
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for (size_t i = 0; i < length; i++) {
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if (state->remaining <= 0) {
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return false;
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}
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const char c = data[i];
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if (c == '\n') {
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printf("\n");
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state->remaining--;
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state->atLineStart = true;
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} else {
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const char text[2] = { (c == '\t' || (static_cast<unsigned char>(c) >= 0x20 && static_cast<unsigned char>(c) < 0x7F)) ? c : '.', '\0' };
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printf("%s", text);
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state->atLineStart = false;
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}
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}
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return state->remaining > 0;
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}
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} // namespace
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namespace coreutils::head {
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static int32_t main(int argc, char* argv[]) {
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int count = 10;
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const int first = parseLineCount(argc, argv, &count);
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if (first >= argc) {
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printf("usage: head [-n N] <file>\n");
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return 1;
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}
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char path[FILE_MAX_PATH_STRING_LENGTH];
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if (!resolvePathArg("head", argv[first], path, sizeof(path))) {
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return 1;
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}
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HeadState state { count, true };
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if (!streamFile(path, &state, emitHeadChunk)) {
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printf("head: %s: cannot read\n", argv[first]);
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return 1;
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}
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if (!state.atLineStart) {
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printf("\n");
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}
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return 0;
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}
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extern const ::AppManifest manifest = {
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.id = "head",
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.name = "head",
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.category = APP_CATEGORY_SYSTEM,
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.location = { .type = APP_LOCATION_MEMORY, .location = reinterpret_cast<void*>(main) },
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.flags = APP_MANIFEST_FLAG_HIDDEN | APP_MANIFEST_FLAG_HEADLESS,
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.stack = { .depth = 4096, .desired_memory_capability = 0 },
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};
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} // namespace coreutils::head
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