From 17287cfcb3afa1eedcc98d342794b77854b4ebc9 Mon Sep 17 00:00:00 2001
From: veclav talica <veclavtalica@protonmal.com>
Date: Sat, 24 Feb 2024 19:15:37 +0500
Subject: [PATCH] pager-based markdown portable browser

---
 browse.sh                      | 22 ++++++++
 tools/widgets/list_selector.py | 95 ++++++++++++++++++++++++++++++++++
 tools/widgets/wrapper.py       | 52 +++++++++++++++++++
 3 files changed, 169 insertions(+)
 create mode 100755 browse.sh
 create mode 100755 tools/widgets/list_selector.py
 create mode 100644 tools/widgets/wrapper.py

diff --git a/browse.sh b/browse.sh
new file mode 100755
index 0000000..102a535
--- /dev/null
+++ b/browse.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set +e
+
+printf "%s" "Enter URL: "
+read URL
+
+articles=$(curl -s "$URL/articles.txt")
+
+# list=''
+# while IFS= read article; do
+#     list+="$article "
+# done < <(printf '%s' "$articles")
+
+while :
+do
+    article=$(./tools/widgets/list_selector.py --desc="Select an article:" --result="line" -- $articles)
+    if [ -z "$article" ]; then
+        break
+    fi
+    curl -s "$URL/markdown/$article.md" | pager
+done
diff --git a/tools/widgets/list_selector.py b/tools/widgets/list_selector.py
new file mode 100755
index 0000000..7dd3eaf
--- /dev/null
+++ b/tools/widgets/list_selector.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+
+from sys import argv
+import curses
+
+from wrapper import widget_wrapper
+
+list_starting_arg = 1
+for i, arg in enumerate(argv[1:]):
+    if arg == '--':
+        if i + 2 == len(argv):
+            print("Empty list given")
+            exit(-1)
+        list_starting_arg = i + 2
+        break
+else:
+    print("List starting -- wasn't given")
+    exit(-1)
+
+desc_arg = ''
+result_arg = 'index'
+
+# todo: Generalize and simplify over descriptor object.
+for arg in argv[1:]:
+    if arg.startswith('--'):
+        if arg == '--':
+            break
+        elif arg.startswith('--result='):
+            result_arg = arg[arg.find('=') + 1:]
+            if result_arg not in ['index', 'line']:
+                print("Invalid --result=")
+                exit(-1)
+        elif arg.startswith('--desc='):
+            desc_arg = arg[arg.find('=') + 1:]
+        else:
+            print("Unknown parameter ", arg)
+            exit(-1)
+    else:
+        print("Unknown parameter ", arg)
+        exit(-1)
+
+current = 0
+lines = argv[list_starting_arg:]
+
+list_box = None
+
+def init(screen):
+    global list_box
+
+    curses.start_color()
+    curses.curs_set(0)
+
+    y = 0
+    if desc_arg != '':
+        list_box = screen.subwin(y + 1, 0)
+        y += 1
+
+def draw_list_box():
+    y = 0
+
+    list_box.border()
+    y += 1
+
+    for i, line in enumerate(lines):
+        list_box.addstr(y, 1, line, curses.A_REVERSE if i == current else curses.A_NORMAL)
+        y += 1
+
+    list_box.refresh()
+
+def driver(screen):
+    global current
+
+    y = 0
+
+    if desc_arg != '':
+        screen.addstr(y, 0, desc_arg)
+        y += 1
+
+    draw_list_box()
+
+    key = screen.getch()
+    if key == curses.KEY_DOWN:
+        current = (current + 1) % len(lines)
+    elif key == curses.KEY_UP:
+        current = len(lines) - 1 if current == 0 else current - 1
+    elif key == curses.KEY_ENTER or key == 10 or key == 13:
+        if result_arg == 'index':
+            return str(current)
+        elif result_arg == 'line':
+            return lines[current]
+
+    screen.refresh()
+
+if __name__ == "__main__":
+    print(widget_wrapper(init, driver))
diff --git a/tools/widgets/wrapper.py b/tools/widgets/wrapper.py
new file mode 100644
index 0000000..82247c1
--- /dev/null
+++ b/tools/widgets/wrapper.py
@@ -0,0 +1,52 @@
+import curses
+import signal
+import atexit
+import os, sys
+from sys import argv, exit
+
+def handler(signum, frame):
+    curses.endwin()
+    exit(1)
+
+# def exit_handler():
+#     curses.endwin()
+
+init = None
+driver = None
+
+def curses_wrapper(screen):
+    curses.noecho()
+    curses.cbreak()
+    screen.keypad(True)
+
+    init(screen)
+
+    while True:
+        result = driver(screen)
+        if result != None:
+            return result
+
+def widget_wrapper(p_init, p_driver):
+    signal.signal(signal.SIGINT, handler)
+    # atexit.register(exit_handler)
+
+    global init, driver
+    init = p_init
+    driver = p_driver
+
+    with open('/dev/tty', 'rb') as inf, open('/dev/tty', 'wb') as outf:
+        saved_stdin = os.dup(0)
+        saved_stdout = os.dup(1)
+        saved_stderr = os.dup(2)
+
+        os.dup2(inf.fileno(), 0)
+        os.dup2(outf.fileno(), 1)
+        os.dup2(outf.fileno(), 2)
+
+        result = curses.wrapper(curses_wrapper)
+
+        os.dup2(saved_stdin, 0)
+        os.dup2(saved_stdout, 1)
+        os.dup2(saved_stderr, 2)
+
+        return result