feat: boot cost indicator in context progress bar

README.md

@@ -43,6 +43,7 @@ Turn the blank status bar into a real-time dashboard: model, context usage with
 | **3-tier rendering** | True color → ANSI → ASCII. Works in any terminal. |
 | **Nerd Font support** | Optional: ``, `󰔟`, `` icons. Set `CLAUDE_STATUSLINE_NERDFONT=1`. |
 | **Powerline separators** | Optional: `` arrows. Set `CLAUDE_STATUSLINE_POWERLINE=1`. |
+| **Boot cost indicator** | Shows how much context your startup config (CLAUDE.md, rules, memory, skills) consumes — before you even ask a question. Progress bar splits into dark (boot) vs gradient (chat). |
 | **< 50ms** | Single `jq` call + cached git. No perceptible lag. |
 
 ## Installation
@@ -102,6 +103,23 @@ Example:
 export CLAUDE_STATUSLINE_NERDFONT=1  # Enable Nerd Font icons + Powerline arrows
 ```
 
+## Boot cost indicator
+
+Most users don't realize how much context their startup configuration consumes. A large `CLAUDE.md`, many rules, memory files, and skills can eat 10–30% of your context window before you even start working.
+
+This fork adds a **boot cost snapshot**: the first time the status line runs in a session, it records the current context usage as your "boot cost." From then on:
+
+- The **progress bar** splits into three zones: dark gray (boot) → gradient (chat) → empty
+- A **`(boot N%)`** label appears next to the percentage, in gray
+
+```
+◆ Opus 4 │ ██████░░░░ 45% (boot 27%) 1M │ $1.20 │ 10m0s
+           ^^          ^^^^
+           boot(dark)  chat(gradient)
+```
+
+The boot snapshot is stored in `/tmp/claude-statusline-boot` and resets with each new session.
+
 ## How it works
 
 Claude Code's `statusLine` hook sends a JSON payload to your script via stdin after every assistant response. The JSON contains the full session state — model, tokens, cost, git info, rate limits, etc.

README.zh-TW.md

@@ -43,6 +43,7 @@
 | **三層渲染退回** | 真彩色 → ANSI → ASCII。任何終端機都能用。 |
 | **Nerd Font 支援** | 選配：``, `󰔟`, `` 圖示。設定 `CLAUDE_STATUSLINE_NERDFONT=1`。 |
 | **Powerline 分隔符** | 選配：`` 箭頭。設定 `CLAUDE_STATUSLINE_POWERLINE=1`。 |
+| **啟動成本指示器** | 顯示你的啟動配置（CLAUDE.md、rules、memory、skills）吃掉多少上下文——在你開口問之前就已經消耗的量。進度條分色：暗灰（啟動）vs 漸層（對話）。 |
 | **< 50ms** | 單次 `jq` 呼叫 + Git 快取。無感延遲。 |
 
 ## 安裝
@@ -98,6 +99,23 @@ chmod +x ~/.claude/statusline.sh
 export CLAUDE_STATUSLINE_NERDFONT=1  # 啟用 Nerd Font 圖示 + Powerline 箭頭
 ```
 
+## 啟動成本指示器
+
+大多數使用者不知道自己的啟動配置吃掉了多少上下文。一個大的 `CLAUDE.md`、很多 rules、memory 檔案和 skills，可以在你還沒開始工作之前就燒掉 10–30% 的上下文視窗。
+
+這個 fork 加入了**啟動成本快照**：狀態列在 session 中第一次執行時，會記錄當下的上下文用量作為「啟動成本」。之後：
+
+- **進度條**分為三個區域：暗灰（啟動）→ 漸層（對話）→ 空白
+- 百分比旁邊會出現灰色的 **`(boot N%)`** 標籤
+
+```
+◆ Opus 4 │ ██████░░░░ 45% (boot 27%) 1M │ $1.20 │ 10m0s
+           ^^          ^^^^
+           啟動(暗灰)   對話(漸層)
+```
+
+啟動快照存在 `/tmp/claude-statusline-boot`，每次新 session 自動重置。
+
 ## 運作原理
 
 Claude Code 的 `statusLine` 機制會在每次助理回覆後，把完整的 session 狀態打包成 JSON，透過 stdin 送給你指定的腳本。

statusline.sh

@@ -142,48 +142,79 @@ parsed=$(echo "$input" | jq -r '
 model="${model_name:-─}"
 
 # ═══════════════════════════════════════════════════════════════
-# 上下文進度條
+# 啟動成本快照（Boot Cost Snapshot）
 # ═══════════════════════════════════════════════════════════════
 
+BOOT_CACHE="/tmp/claude-statusline-boot"
+
 pct_int=${ctx_pct%.*}
 pct_int=${pct_int:-0}
 if (( pct_int < 0 )); then pct_int=0; fi
 if (( pct_int > 100 )); then pct_int=100; fi
 
+# 第一次執行時鎖定啟動成本
+boot_pct=0
+if [[ ! -f "$BOOT_CACHE" ]]; then
+  echo "$pct_int" > "$BOOT_CACHE"
+  boot_pct=$pct_int
+else
+  boot_pct=$(cat "$BOOT_CACHE" 2>/dev/null)
+  boot_pct=${boot_pct:-0}
+fi
+
+# ═══════════════════════════════════════════════════════════════
+# 上下文進度條（含啟動成本分色）
+# ═══════════════════════════════════════════════════════════════
+
 bar_filled=$(( pct_int / 10 ))
 if (( bar_filled > 10 )); then bar_filled=10; fi
 
+boot_filled=$(( boot_pct / 10 ))
+if (( boot_filled > 10 )); then boot_filled=10; fi
+
 # 漸層色（真彩色）：綠 → 黃 → 橘 → 紅
 GRAD_R=(46 116 186 241 239 236 233 231 211 192)
 GRAD_G=(204 195 186 196 161 126 101 76 66 57)
 GRAD_B=(113 89 64 15 24 34 44 60 50 43)
 
+# 進度條三態：boot(暗灰█) → chat(漸層█) → 空(暗灰░)
 bar=""
 if [[ "$USE_ASCII" == "1" ]]; then
-  # ASCII 模式
   for (( i=0; i<10; i++ )); do
-    if (( i < bar_filled )); then bar+="#"; else bar+="-"; fi
+    if (( i < boot_filled )); then bar+="="
+    elif (( i < bar_filled )); then bar+="#"
+    else bar+="-"; fi
   done
 elif (( USE_TRUECOLOR )); then
-  # 真彩色漸層：每格獨立上色
   for (( i=0; i<10; i++ )); do
-    if (( i < bar_filled )); then
+    if (( i < boot_filled )); then
+      # boot 區：暗灰實心，表示「已被吃掉，回不來」
+      bar+="\\033[38;2;80;80;80m█"
+    elif (( i < bar_filled )); then
+      # chat 區：原版漸層色
       bar+="\\033[38;2;${GRAD_R[$i]};${GRAD_G[$i]};${GRAD_B[$i]}m█"
     else
+      # 空區：暗灰空心
       bar+="\\033[38;2;60;60;60m░"
     fi
   done
   bar+="${RST}"
 else
-  # ANSI 退回：依整體百分比選色
   if (( pct_int >= 90 )); then bar_color="$RED"
   elif (( pct_int >= 70 )); then bar_color="$YELLOW"
   else bar_color="$GREEN"; fi
 
   for (( i=0; i<10; i++ )); do
-    if (( i < bar_filled )); then bar+="█"; else bar+="░"; fi
+    if (( i < boot_filled )); then bar+="${GRAY}█${RST}"
+    elif (( i < bar_filled )); then bar+="${bar_color}█${RST}"
+    else bar+="░"; fi
   done
-  bar="${bar_color}${bar}${RST}"
+fi
+
+# boot 標籤（灰色小字，持續提醒）
+boot_label=""
+if (( boot_pct > 0 )); then
+  boot_label=" ${GRAY}(boot ${boot_pct}%)${RST}"
 fi
 
 # 百分比文字顏色（跟進度條整體色一致）
@@ -324,7 +355,7 @@ else prompt_color="$GREEN"; fi
 # ═══════════════════════════════════════════════════════════════
 
 line1="${PURPLE}${S_BRAND}${RST} ${CYAN}${model}${RST}"
-line1+="${SEP}${bar} ${pct_color}${pct_int}%${RST}${ctx_warn}${ctx_label}"
+line1+="${SEP}${bar} ${pct_color}${pct_int}%${RST}${boot_label}${ctx_warn}${ctx_label}"
 line1+="${SEP}${cost_color}${S_COST}\$${cost_fmt}${RST}"
 line1+="${dur_section}"
 line1+="${rate_section}"