feat: add raw func and allow using funcs in output name

examples/hledger_monthly.md

@@ -0,0 +1,45 @@
+---
+output: "monthly_report_{{.b}}.md"
+params:
+  b:
+    required: true
+    default: 2011-01
+    usage: |
+      Required.
+      The begin time of report.
+      Examples:
+        2025
+        2025-07
+        2025-07-15
+        Jul
+  e:
+    required: true
+    default: 2011-02
+    usage: |
+      Required.
+      The end time of report.
+      Same format as -b
+  f:
+    default: examples/ledger.j
+    usage: The ledger file to parse
+---
+
+# Finance Report from {{.b}} to {{.e}}
+
+## Previous status:
+
+{{ shell "hledger -f $f balancesheet -e $b" }}
+
+## Expenses:
+
+### Expense Summary by Category
+
+{{ shell "hledger -f $f bal expenses -b $b -e $e --depth 3 --sort amount --budget" }}
+
+## Net Income:
+
+{{shell "hledger -f $f income -b $b -e $e --monthly"}}
+
+## Ending balance:
+
+{{shell "hledger -f $f balancesheet -e $e"}}

examples/system-info.md

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+---
+output: sys-report-{{ raw "date --iso-8601" }}.md
+---
+
+# 💥 System Information Report for {{ sh "hostname" }}
+
+* **Hostname**: {{ sh "hostname" }}
+* **Username**: {{ sh "whoami" }}
+* **Uptime**: {{ sh "uptime -p" }}
+* **System**: {{ sh "uname -a" }}
+* **CPU**: {{ sh "uname -m" }} — {{ sh "nproc" }} cores
+* **IP Address**: {{ sh "hostname -I || ip a | grep inet" }}
+* **Default Gateway**: {{ sh "ip route | grep default || netstat -rn | grep default" }}
+
+---
+
+## 🧠 Memory Usage
+
+{{ shell "free -h" }}
+
+---
+
+## 📉 Disk Usage
+
+{{ shell "df -h /" }}
+
+---
+
+Generated on: {{ sh "date" }}