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fix: CJK/Unicode wide character support (#13)

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Set UTF-8 locale in all PTY spawn environments, add xterm-addon-unicode11
for proper double-width character measurement, and update LocalEchoOverlay
helpers to respect CJK character visual width in positioning, line wrapping,
and cursor placement.

Based on PR #13 by @TeigenZhang, adapted to current codebase structure.

Co-Authored-By: Tenggan Zhang <TeigenZhang@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
arkon
2026-02-24 16:13:09 +01:00
co-authored by Tenggan Zhang Claude Opus 4.6
parent 5170c188c3
commit 3c29b1fa6e
6 changed files with 94 additions and 17 deletions
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src/session.ts
+8 -2
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@@ -949,7 +949,7 @@ export class Session extends EventEmitter {
cols: 120,
rows: 40,
cwd: this.workingDir,
env: { ...process.env, TERM: 'xterm-256color', COLORTERM: undefined, CLAUDECODE: undefined },
env: { ...process.env, LANG: 'en_US.UTF-8', LC_ALL: 'en_US.UTF-8', TERM: 'xterm-256color', COLORTERM: undefined, CLAUDECODE: undefined },
});
// Set claudeSessionId immediately since we passed --session-id to Claude
@@ -1016,6 +1016,8 @@ export class Session extends EventEmitter {
cwd: this.workingDir,
env: {
...process.env,
LANG: 'en_US.UTF-8',
LC_ALL: 'en_US.UTF-8',
PATH: getAugmentedPath(),
TERM: 'xterm-256color',
COLORTERM: undefined,
@@ -1295,7 +1297,7 @@ export class Session extends EventEmitter {
cols: 120,
rows: 40,
cwd: this.workingDir,
env: { ...process.env, TERM: 'xterm-256color', COLORTERM: undefined, CLAUDECODE: undefined },
env: { ...process.env, LANG: 'en_US.UTF-8', LC_ALL: 'en_US.UTF-8', TERM: 'xterm-256color', COLORTERM: undefined, CLAUDECODE: undefined },
});
} catch (spawnErr) {
console.error('[Session] Failed to spawn PTY for shell mux attachment:', spawnErr);
@@ -1330,6 +1332,8 @@ export class Session extends EventEmitter {
cwd: this.workingDir,
env: {
...process.env,
LANG: 'en_US.UTF-8',
LC_ALL: 'en_US.UTF-8',
TERM: 'xterm-256color',
CLAUDEMAN_MUX: '1',
CLAUDEMAN_SESSION_ID: this.id,
@@ -1458,6 +1462,8 @@ export class Session extends EventEmitter {
cwd: this.workingDir,
env: {
...process.env,
LANG: 'en_US.UTF-8',
LC_ALL: 'en_US.UTF-8',
PATH: getAugmentedPath(),
TERM: 'xterm-256color',
COLORTERM: undefined,