feat: add pre-comit check check-title-initial

.pre-commit-hooks.yaml

@@ -66,3 +66,8 @@
   entry: pre_commit_hooks/main.sh check-chinese
   language: script
   types_or: [markdown]
+- id: check-title-initial
+  name: Check if the first letter of the title is capitalized
+  entry: pre_commit_hooks/main.sh check-title-initial
+  language: script
+  types_or: [markdown]

pre_commit_hooks/check-title-initial.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+check() {
+    local ret=0
+
+    # Check if the first letter of the title is capitalized
+    if grep -qE '^# [a-z]' "$1" >/dev/null
+    then
+        ret=1
+        echo "$1: First letter of the title should be capitalized" >&2
+        if ! $DRY_RUN
+        then
+            sed -i -E 's/^# ([a-z])/# \U\1/' "$1"
+        fi
+    fi
+
+    return $ret
+}