From 5bb4139e6c98539564431de105dc9e0d06e207ac Mon Sep 17 00:00:00 2001
From: Thiago de Arruda <tpadilha84@gmail.com>
Date: Wed, 26 Aug 2015 09:08:52 -0300
Subject: [PATCH] contrib: Implement gdb pretty printer for UGrid

---
 contrib/{neovim_gdb => gdb}/neovim_gdb.vim |  0
 contrib/gdb/nvim-gdb-pretty-printers.py    | 92 ++++++++++++++++++++++
 2 files changed, 92 insertions(+)
 rename contrib/{neovim_gdb => gdb}/neovim_gdb.vim (100%)
 create mode 100644 contrib/gdb/nvim-gdb-pretty-printers.py

diff --git a/contrib/neovim_gdb/neovim_gdb.vim b/contrib/gdb/neovim_gdb.vim
similarity index 100%
rename from contrib/neovim_gdb/neovim_gdb.vim
rename to contrib/gdb/neovim_gdb.vim
diff --git a/contrib/gdb/nvim-gdb-pretty-printers.py b/contrib/gdb/nvim-gdb-pretty-printers.py
new file mode 100644
index 0000000000..609ceeb7ab
--- /dev/null
+++ b/contrib/gdb/nvim-gdb-pretty-printers.py
@@ -0,0 +1,92 @@
+# Register a gdb pretty printer for UGrid instances. Usage:
+#
+# - start gdb
+# - run `source contrib/gdb/nvim-gdb-pretty-printers.py`
+# - when a `UGrid` pointer can be evaluated in the current frame, just print
+#   it's value normally: `p *grid` (assuming `grid` is the variable name
+#   holding the pointer)
+# - highlighting can be activated by setting the NVIM_GDB_HIGHLIGHT_UGRID
+#   environment variable(only xterm-compatible terminals supported). This
+#   can be done while gdb is running through the python interface:
+#   `python os.environ['NVIM_GDB_HIGHLIGHT_UGRID'] = '1'`
+import os
+import gdb
+import gdb.printing
+
+
+SGR0 = '\x1b(B\x1b[m'
+
+
+def get_color_code(bg, color_num):
+    if color_num < 16:
+        prefix = 3
+        if color_num > 7:
+            prefix = 9
+        if bg:
+            prefix += 1
+        color_num %= 8
+    else:
+        prefix = '48;5;' if bg else '38;5;' 
+    return '\x1b[{0}{1}m'.format(prefix, color_num)
+
+
+def highlight(attrs):
+    fg, bg = [int(attrs['foreground']), int(attrs['background'])]
+    rv = [SGR0] # start with sgr0
+    if fg != -1:
+        rv.append(get_color_code(False, fg))
+    if bg != -1:
+        rv.append(get_color_code(True, bg))
+    if bool(attrs['bold']):
+        rv.append('\x1b[1m')
+    if bool(attrs['italic']):
+        rv.append('\x1b[3m')
+    if bool(attrs['undercurl']) or bool(attrs['underline']):
+        rv.append('\x1b[4m')
+    if bool(attrs['reverse']):
+        rv.append('\x1b[7m')
+    return ''.join(rv)
+
+
+class UGridPrinter(object):
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        do_hl = (os.getenv('NVIM_GDB_HIGHLIGHT_UGRID') and
+                 os.getenv('NVIM_GDB_HIGHLIGHT_UGRID') != '0')
+        grid = self.val
+        height = int(grid['height'])
+        width = int(grid['width'])
+        delimiter = '-' * (width + 2)
+        rows = [delimiter]
+        for row in range(height):
+            cols = []
+            if do_hl:
+                cols.append(SGR0)
+            curhl = None
+            for col in range(width):
+                cell = grid['cells'][row][col]
+                if do_hl:
+                    hl = highlight(cell['attrs'])
+                    if hl != curhl:
+                        cols.append(hl)
+                        curhl = hl
+                cols.append(cell['data'].string('utf-8'))
+            if do_hl:
+                cols.append(SGR0)
+            rows.append('|' + ''.join(cols) + '|')
+        rows.append(delimiter)
+        return '\n' + '\n'.join(rows)
+
+    def display_hint(self):
+        return 'hint'
+
+
+def pretty_printers():
+    pp = gdb.printing.RegexpCollectionPrettyPrinter('nvim')
+    pp.add_printer('UGrid', '^ugrid$', UGridPrinter)
+    return pp
+
+
+gdb.printing.register_pretty_printer(gdb, pretty_printers(), replace=True)