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-rw-r--r--src/editor.py116
1 files changed, 79 insertions, 37 deletions
diff --git a/src/editor.py b/src/editor.py
index fc75baa..5fd896a 100644
--- a/src/editor.py
+++ b/src/editor.py
@@ -22,10 +22,11 @@ import sys
from subprocess import Popen, PIPE
-'''
-GNU Emacs alike text area
-'''
class TextArea():
+ '''
+ GNU Emacs alike text area
+ '''
+
def __init__(self, fields, datamap, left, top, width, height):
'''
Constructor
@@ -46,12 +47,35 @@ class TextArea():
self.last_alert, self.last_status, self.alerted = None, None, False
+ @staticmethod
+ def limit(min_value, value, max_value):
+ '''
+ Limit a value to a closed set
+
+ @param min_value Minimum value
+ @param value Preferred value
+ @param max_value Maximum value
+ '''
+ return min(max(min_value, value), max_value)
+
+
+ @staticmethod
+ def ctrl(key):
+ '''
+ Return the symbol for a specific letter pressed in combination with Ctrl
+
+ @param key Without Ctrl
+ @return With Ctrl
+ '''
+ return chr(ord(key) - ord('@'))
+
+
def get_selection(self, for_display = False):
a = min(self.mark, self.x)
b = max(self.mark, self.x)
if for_display:
- a = min(max(a - self.offx, 0), self.areawidth)
- b = min(max(b - self.offx, 0), self.areawidth)
+ a = limit(0, a - self.offx, self.areawidth)
+ b = limit(0, b - self.offx, self.areawidth)
return (a, b)
@@ -119,7 +143,7 @@ class TextArea():
removed = 1
self.text = self.text[:self.area.x] + self.text[self.area.x + 1:]
text = self.text[self.area.offx:][:self.area.areawidth]
- a = min(max(self.area.x - self.area.offx, 0), self.area.areawidth)
+ a = limit(0, self.area.x - self.area.offx, self.area.areawidth)
left = self.area.left + self.area.innerleft + a
print('\033[%i;%iH%s\033[%i;%iH' % (self.area.top + self.y, left, text[a:] + ' ' * removed, self.area.top + self.y, left), end='')
return True
@@ -224,6 +248,11 @@ class TextArea():
def status(self, text):
+ '''
+ Print a message to the status bar
+
+ @param text:str The message
+ '''
txt = ' (' + text + ') '
y = self.top + self.y
x = self.left + self.innerleft + self.x - self.offx
@@ -231,6 +260,11 @@ class TextArea():
self.last_status = text
def alert(self, text):
+ '''
+ Print a message to the alert bar
+
+ @param text:str The message
+ '''
if text is None:
self.alert('')
self.alerted = False
@@ -242,9 +276,15 @@ class TextArea():
self.last_alert = text
def restatus(self):
+ '''
+ Reprint the status bar
+ '''
self.status(self.last_status)
def realert(self):
+ '''
+ Reprint the alert bar
+ '''
self.alert(self.last_alert)
@@ -252,7 +292,9 @@ class TextArea():
'''
Execute text reading
- @param saver Save method
+ @param saver:()→void Save method
+ @param preredrawer:()→void Method to call before redrawing screen
+ @param postredrawer:()→void Method to call after redaring screen
'''
self.status('unmodified')
@@ -261,7 +303,7 @@ class TextArea():
override = False
oldy, oldx, oldmark = self.y, self.x, self.mark
- stored = chr(ord('L') - ord('@'))
+ stored = ctrl('L')
edited = False
while True:
@@ -285,7 +327,7 @@ class TextArea():
stored = None
if self.alerted:
self.alert(None)
- if ord(d) == ord('@') - ord('@'):
+ if d == ctrl('@'):
if self.mark is None:
self.mark = self.x
self.alert('Mark set')
@@ -298,33 +340,33 @@ class TextArea():
else:
self.mark = self.x
self.alert('Mark set')
- elif ord(d) == ord('K') - ord('@'):
+ elif d == ctrl('K'):
if not self.lines[self.y].kill():
self.alert('At end')
else:
edited = True
- elif ord(d) == ord('W') - ord('@'):
+ elif d == ctrl('W'):
if not self.lines[self.y].cut():
self.alert('No text is selected')
else:
edited = True
- elif ord(d) == ord('Y') - ord('@'):
+ elif d == ctrl('Y'):
if not self.lines[self.y].yank():
self.alert('Killring is empty')
else:
edited = True
- elif ord(d) == ord('X') - ord('@'):
+ elif d == ctrl('X'):
self.alert('C-x')
sys.stdout.flush()
d = sys.stdin.read(1)
self.alert(str(ord(d)))
sys.stdout.flush()
- if ord(d) == ord('X') - ord('@'):
+ if d == ctrl('X'):
if self.lines[self.y].swap_mark():
self.alert('Mark swapped')
else:
self.alert('No mark is activated')
- elif ord(d) == ord('S') - ord('@'):
+ elif d == ctrl('S'):
last = ''
for row in range(0, len(self.lines)):
self.datamap[self.lines[row].name] = self.lines[row].text
@@ -332,7 +374,7 @@ class TextArea():
modified = False
self.status('unmodified' + (' override' if override else ''))
self.alert('Saved')
- elif ord(d) == ord('C') - ord('@'):
+ elif d == ctrl('C'):
break
else:
stored = d
@@ -341,33 +383,33 @@ class TextArea():
if not self.lines[self.y].erase():
self.alert('At beginning')
elif ord(d) < ord(' '):
- if ord(d) == ord('P') - ord('@'):
+ if d == ctrl('P'):
if self.y == 0:
self.alert('At first line')
else:
self.y -= 1
self.mark = None
self.x = 0
- elif ord(d) == ord('N') - ord('@'):
+ elif d == ctrl('N'):
if self.y < len(self.lines) - 1:
self.y += 1
self.mark = None
self.x = 0
else:
self.alert('At last line')
- elif ord(d) == ord('F') - ord('@'):
+ elif d == ctrl('F'):
if not self.lines[self.y].move_point(1):
self.alert('At end')
- elif ord(d) == ord('E') - ord('@'):
+ elif d == ctrl('E'):
if not self.lines[self.y].move_point(len(self.lines[self.y].text) - self.x):
self.alert('At end')
- elif ord(d) == ord('B') - ord('@'):
+ elif d == ctrl('B'):
if not self.lines[self.y].move_point(-1):
self.alert('At beginning')
- elif ord(d) == ord('A') - ord('@'):
+ elif d == ctrl('A'):
if not self.lines[self.y].move_point(-self.x):
self.alert('At beginning')
- elif ord(d) == ord('L') - ord('@'):
+ elif d == ctrl('L'):
print('\033[H\033[2J', end='')
preredrawer()
for line in self.lines:
@@ -375,7 +417,7 @@ class TextArea():
postredrawer()
self.realert()
self.restatus()
- elif ord(d) == ord('D') - ord('@'):
+ elif d == ctrl('D'):
if not self.lines[self.y].delete():
self.alert('At end')
else:
@@ -385,16 +427,16 @@ class TextArea():
if d == '[':
d = sys.stdin.read(1)
if d == 'A':
- stored = chr(ord('P') - ord('@'))
+ stored = ctrl('P'):
elif d == 'B':
if self.y == len(self.lines) - 1:
self.alert('At last line')
else:
- stored = chr(ord('N') - ord('@'))
+ stored = ctrl('N')
elif d == 'C':
- stored = chr(ord('F') - ord('@'))
+ stored = ctrl('F')
elif d == 'D':
- stored = chr(ord('B') - ord('@'))
+ stored = ctrl('B')
elif d == '2':
d = sys.stdin.read(1)
if d == '~':
@@ -403,35 +445,35 @@ class TextArea():
elif d == '3':
d = sys.stdin.read(1)
if d == '~':
- stored = chr(ord('D') - ord('@'))
+ stored = ctrl('D')
elif d == '1':
d = sys.stdin.read(1)
if d == '~':
- stored = chr(ord('A') - ord('@'))
+ stored = ctrl('A')
elif d == '4':
d = sys.stdin.read(1)
if d == '~':
- stored = chr(ord('E') - ord('@'))
+ stored = ctrl('E')
else:
while True:
d = sys.stdin.read(1)
- if (ord('a') <= ord(d)) and (ord(d) <= ord('z')): break
- if (ord('A') <= ord(d)) and (ord(d) <= ord('Z')): break
+ if ord('a') <= ord(d) <= ord('z'): break
+ if ord('A') <= ord(d) <= ord('Z'): break
if d == '~': break
elif d == 'O':
d = sys.stdin.read(1)
if d == 'H':
- stored = chr(ord('A') - ord('@'))
+ stored = ctrl('A')
elif d == 'F':
- stored = chr(ord('E') - ord('@'))
+ stored = ctrl('E')
elif (d == 'w') or (d == 'W'):
if not self.lines[self.y].copy():
self.alert('No text is selected')
elif (d == 'y') or (d == 'Y'):
if not self.lines[self.y].yank_cycle():
- stored = chr(ord('Y') - ord('@'))
+ stored = ctrl('Y')
elif d == '\n':
- stored = chr(ord('N') - ord('@'))
+ stored = ctrl('N')
else:
insert = d
if len(insert) == 0:
generated by cgit v1.2.3-70-g09d2 (git 2.51.0) at 2026-02-20 23:18:27 +0000