TNT/include/utf8.h
m1ngsama 07fd7b1513
refactor: optimize rendering, log loading, and migrate to libssh callback API (#9)
This PR addresses critical performance bottlenecks, improves UX, and eliminates technical debt.

### Key Changes

**1. Performance Optimization:**
- **Startup**: Rewrote `message_load` to scan `messages.log` backwards from the end
  - Complexity reduced from O(FileSize) to O(MaxMessages)
  - Large log file startup: seconds → milliseconds
- **Rendering**: Optimized TUI rendering to use line clearing (`\033[K`) instead of full-screen clearing (`\033[2J`)
  - Eliminated visual flicker

**2. libssh API Migration:**
- Replaced deprecated message-based API with callback-based server implementation
- Removed `#pragma GCC diagnostic ignored "-Wdeprecated-declarations"`
- Ensures future libssh compatibility

**3. User Experience (Vim Mode):**
- Added `Ctrl+W` (Delete Word) and `Ctrl+U` (Delete Line) in Insert/Command modes
- Modified `Ctrl+C` behavior to safely switch modes instead of terminating connection
- Added support for `\n` as Enter key (fixing piped input issues)

**4. Project Structure:**
- Moved all test scripts to `tests/` directory
- Added `make test` target
- Updated CI/CD to run comprehensive test suite

### Verification
-  All tests passing (17/17)
-  CI passing on Ubuntu and macOS
-  AddressSanitizer clean
-  Valgrind clean (no memory leaks)
-  Zero compilation warnings

### Code Quality
**Rating:** 🟢 Good Taste
- Algorithm-driven optimization (not hacks)
- Simplified architecture (callback-based API)
- Zero breaking changes (all tests pass)
2026-02-07 23:17:55 +08:00

33 lines
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C

#ifndef UTF8_H
#define UTF8_H
#include "common.h"
/* UTF-8 character width calculation */
int utf8_char_width(uint32_t codepoint);
/* Get the number of bytes in a UTF-8 character from its first byte */
int utf8_byte_length(unsigned char first_byte);
/* Decode a UTF-8 character and return its codepoint */
uint32_t utf8_decode(const char *str, int *bytes_read);
/* Calculate display width of a UTF-8 string (considering CJK double-width) */
int utf8_string_width(const char *str);
/* Truncate string to fit within max_width display characters */
void utf8_truncate(char *str, int max_width);
/* Count the number of UTF-8 characters in a string */
int utf8_strlen(const char *str);
/* Remove last UTF-8 character from string */
void utf8_remove_last_char(char *str);
/* Remove last word from string (mimic Ctrl+W) */
void utf8_remove_last_word(char *str);
/* Validate a UTF-8 byte sequence */
bool utf8_is_valid_sequence(const char *bytes, int len);
#endif /* UTF8_H */