From 5a71d02d329f759ea99ad0a206d968a27ed00eab Mon Sep 17 00:00:00 2001
From: Fabian Homborg <FHomborg@gmail.com>
Date: Sat, 27 Nov 2021 09:53:11 +0100
Subject: [PATCH] Webconfig: Don't outright abort if curses can't be imported

We only need the curses module to look up sgr0, bold and underline
sequences.

Since those are going to be the xterm versions 90% of the time, we can
simply use those if this fails.

Fixes #8487.
---
 share/tools/web_config/webconfig.py | 44 ++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 16 deletions(-)

diff --git a/share/tools/web_config/webconfig.py b/share/tools/web_config/webconfig.py
index 3db3194f2..2a73bb889 100755
--- a/share/tools/web_config/webconfig.py
+++ b/share/tools/web_config/webconfig.py
@@ -508,25 +508,37 @@ g_special_escapes_dict = None
 def get_special_ansi_escapes():
     global g_special_escapes_dict
     if g_special_escapes_dict is None:
-        import curses
+        try:
+            import curses
 
-        g_special_escapes_dict = {}
-        curses.setupterm()
+            g_special_escapes_dict = {}
+            curses.setupterm()
 
-        # Helper function to get a value for a tparm
-        def get_tparm(key):
-            val = None
-            key = curses.tigetstr(key)
-            if key:
-                val = curses.tparm(key)
-            if val:
-                val = val.decode("utf-8")
-            return val
+            # Helper function to get a value for a tparm
+            def get_tparm(key):
+                val = None
+                key = curses.tigetstr(key)
+                if key:
+                    val = curses.tparm(key)
+                if val:
+                    val = val.decode("utf-8")
+                return val
 
-        # Just a few for now
-        g_special_escapes_dict["exit_attribute_mode"] = get_tparm("sgr0")
-        g_special_escapes_dict["bold"] = get_tparm("bold")
-        g_special_escapes_dict["underline"] = get_tparm("smul")
+            # Just a few for now
+            g_special_escapes_dict["exit_attribute_mode"] = get_tparm("sgr0")
+            g_special_escapes_dict["bold"] = get_tparm("bold")
+            g_special_escapes_dict["underline"] = get_tparm("smul")
+        except ImportError:
+            print("WARNING: The python curses module is missing.")
+            print("WARNING: Falling back to xterm-256color settings.")
+            print("WARNING: Rebuild python with curses headers!")
+
+            g_special_escapes_dict = {
+                'exit_attribute_mode': '\x1b(B\x1b[m',
+                'bold': '\x1b[1m',
+                'underline': '\x1b[4m'
+            }
+            pass
 
     return g_special_escapes_dict