From 3c2d5f27b39dbc82d3c87fc7d983a886fdff891c Mon Sep 17 00:00:00 2001
From: Krzysztof Rudnicki <krzysztofrudnicki0@gmail.com>
Date: Sun, 7 Sep 2025 22:00:20 +0200
Subject: [PATCH] feat: live reload

---
 articles/index.html |  4 +--
 articles/run.sh     | 83 ++++++++++++++++++++++++++++++++++++---------
 articles/server_c.c | 19 +++++++++++
 3 files changed, 88 insertions(+), 18 deletions(-)
diff --git a/articles/index.html b/articles/index.html
index d8526b8..6456b5c 100644
--- a/articles/index.html
+++ b/articles/index.html
@@ -2,7 +2,7 @@
 <html lang="en">
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width,initial-scale=1">
-<title>Mini Articles</title>
+<title>wassup</title>
 <style>
 /* Tiny, readable defaults */
 *{box-sizing:border-box}html,body{height:100%}body{margin:0;font:16px/1.4 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,'Helvetica Neue',Arial,sans-serif;color:#222;background:#fff}
@@ -33,7 +33,7 @@ article h1{margin:.25rem 0 .5rem;font-size:1.6rem}
 </style>
 
 <header>
-  <h1>Mini Articles</h1>
+  <h1>Hi</h1>
   <nav>
     <button id="toList" title="All articles">List</button>
     <button id="toNew" title="Create article">New</button>
diff --git a/articles/run.sh b/articles/run.sh
index 41d1060..6f731ab 100755
--- a/articles/run.sh
+++ b/articles/run.sh
@@ -9,25 +9,76 @@ SITE_DIR="$DIR"
 HOST="${HOST:-127.0.0.1}"
 PORT="${PORT:-8000}"
 
-make -s -C "$SITE_DIR" server_c
+start_server() {
+  make -s -C "$SITE_DIR" server_c
+  export HOST PORT ARTICLES_DATA_DIR
+  "$SITE_DIR/server_c" &
+  SRV_PID=$!
+}
 
-# Start C server in background
-export HOST PORT ARTICLES_DATA_DIR
-"$SITE_DIR/server_c" &
-SRV_PID=$!
-trap 'kill $SRV_PID 2>/dev/null || true' EXIT INT TERM
+stop_server() {
+  if [[ -n "${SRV_PID:-}" ]] && kill -0 "$SRV_PID" 2>/dev/null; then
+    kill "$SRV_PID" 2>/dev/null || true
+    wait "$SRV_PID" 2>/dev/null || true
+  fi
+}
+
+restart_server() {
+  echo "[watch] Rebuilding and restarting server_c..."
+  stop_server
+  start_server
+}
+
+open_browser_once() {
+  local url="http://$HOST:$PORT/"
+  if command -v xdg-open >/dev/null 2>&1; then
+    xdg-open "$url" >/dev/null 2>&1 || true
+  fi
+  echo "Mini Articles running at $url"
+}
+
+start_server
+trap 'stop_server' EXIT INT TERM
 
 # Give it a moment to start
 sleep 0.5
-URL="http://$HOST:$PORT/"
+open_browser_once
 
-# Try to open browser on Linux
-if command -v xdg-open >/dev/null 2>&1; then
-  xdg-open "$URL" >/dev/null 2>&1 || true
+echo "Press Ctrl+C to stop. Watching for changes in index.html and server_c.c (auto-reload enabled)..."
+
+watch_poll() {
+  local idx_mtime srv_mtime new_idx new_srv
+  idx_mtime=$(stat -c %Y "$SITE_DIR/index.html" 2>/dev/null || echo 0)
+  srv_mtime=$(stat -c %Y "$SITE_DIR/server_c.c" 2>/dev/null || echo 0)
+  while true; do
+    sleep 0.5
+    new_idx=$(stat -c %Y "$SITE_DIR/index.html" 2>/dev/null || echo 0)
+    new_srv=$(stat -c %Y "$SITE_DIR/server_c.c" 2>/dev/null || echo 0)
+    if [[ "$new_srv" != "$srv_mtime" ]]; then
+      srv_mtime="$new_srv"
+      restart_server
+    fi
+    if [[ "$new_idx" != "$idx_mtime" ]]; then
+      idx_mtime="$new_idx"
+  echo "[watch] index.html changed. Browser will auto-reload."
+    fi
+  done
+}
+
+watch_inotify() {
+  inotifywait -e close_write,create,move --format '%w%f' -m \
+    "$SITE_DIR/index.html" "$SITE_DIR/server_c.c" | while read -r file; do
+      case "$file" in
+        *server_c.c) restart_server ;;
+  *index.html) echo "[watch] index.html changed. Browser will auto-reload." ;;
+      esac
+    done
+}
+
+if command -v inotifywait >/dev/null 2>&1; then
+  watch_inotify &
+  WATCH_PID=$!
+  wait "$WATCH_PID"
+else
+  watch_poll
 fi
-
-echo "Mini Articles running at $URL"
-
-echo "Press Ctrl+C to stop."
-# Wait on server
-wait "$SRV_PID"
diff --git a/articles/server_c.c b/articles/server_c.c
index 931fdbc..0e94153 100644
--- a/articles/server_c.c
+++ b/articles/server_c.c
@@ -20,6 +20,7 @@
 
 static volatile sig_atomic_t g_stop = 0;
 static const char *DOC_ROOT = NULL; // current working directory
+static long long g_boot_ms = 0; // server start time for live-reload token
 
 static void on_sigint(int sig){ (void)sig; g_stop = 1; }
 
@@ -261,6 +262,13 @@ static void handle_static(int c, const char* path){
   fseek(f,0,SEEK_END); long sz=ftell(f); fseek(f,0,SEEK_SET); char* buf=malloc((size_t)sz); if(!buf){ fclose(f); send_response(c,500,"Internal Server Error","text/plain","",0,false); return; }
   size_t n=fread(buf,1,(size_t)sz,f); fclose(f);
   const char* mime=guess_mime(full);
+  // Inject a tiny live-reload script into index.html at serve-time (does not affect file size on disk)
+  if(strstr(mime, "text/html") && (!strcmp(rel, "/index.html"))){
+    const char* lr = "<script>setInterval(()=>fetch('/__lr').then(r=>r.text()).then(t=>{if(window.__lr!==t){if(window.__lr)location.reload();window.__lr=t}}),500);</script>";
+    size_t ln = strlen(lr);
+    char* out = malloc(n + ln);
+    if(out){ memcpy(out, buf, n); memcpy(out + n, lr, ln); send_response(c,200,"OK",mime,out,n+ln,false); free(out); free(buf); return; }
+  }
   send_response(c,200,"OK",mime,buf,n,false); free(buf);
 }
 
@@ -279,6 +287,16 @@ static void handle_client(int c){
   char* body = NULL; if(content_length){ body = malloc(content_length+1); if(!body){ close(c); return; } size_t off=0; if(have_body){ size_t cpy = have_body>content_length?content_length:have_body; memcpy(body, buf+header_bytes, cpy); off = cpy; }
     size_t remain = content_length - off; while(remain>0){ ssize_t rr = recv(c, body+off, remain, 0); if(rr<=0) break; off+=rr; remain-=rr; } body[content_length]='\0'; }
 
+  // Lightweight live-reload timestamp endpoint
+  if(!strcmp(method, "GET") && !strcmp(path, "/__lr")){
+    char idx[SMALL_BUF*2]; snprintf(idx, sizeof(idx), "%s/index.html", DOC_ROOT?DOC_ROOT:".");
+    struct stat st; char out[96]; size_t w=0;
+    if(stat(idx, &st)==0){ w=(size_t)snprintf(out, sizeof(out), "%ld-%lld", (long)st.st_mtime, g_boot_ms); }
+    else { out[0]='0'; w=1; }
+    send_response(c,200,"OK","text/plain",out,w,false);
+    free(body); close(c); return;
+  }
+
   if(!strncmp(path, "/api/", 5)){
     handle_api(c, method, path, body, content_length);
   } else if(!strcmp(method,"GET")){
@@ -295,6 +313,7 @@ static void handle_client(int c){
 int main(int argc, char** argv){
   signal(SIGINT, on_sigint);
   srand((unsigned int)time(NULL));
+  g_boot_ms = now_ms();
   char cwd[SMALL_BUF]; if(getcwd(cwd,sizeof(cwd))) DOC_ROOT=strdup(cwd);
   const char* host = getenv_default("HOST","127.0.0.1");
   int port = atoi(getenv_default("PORT","8000")); if(port<=0) port=8000;
