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--- vim [2021/01/03 16:22] – created - external edit 127.0.0.1
+++ vim [2025/10/27 03:31] (current) – zhangyk
@@ Line 26: / Line 26: @@
 ===== How to change default font in windows =====
   * In C:\Users\<username>\_vimrc: [[https://superuser.com/questions/364792/how-can-i-set-the-default-font-for-gvim-on-windows | ref]]
+(The # shall be removed.)
 <code>
 if has("gui_kde")
-    set guifont=Consolas/13/-1/5/50/0/0/0/0/0
+    #set guifont=Consolas/13/-1/5/50/0/0/0/0/0
 elseif has("gui_gtk")
-    set guifont=Consolas\ 13
+    #set guifont=Consolas\ 13
 elseif has("gui_running")
     if has("win32") || has("win64")
-        set guifont=Consolas:h12
+        #set guifont=Consolas:h12
     else
-        set guifont=-xos4-terminus-medium-r-normal--14-140-72-72-c-80-iso8859-1
+        #set guifont=-xos4-terminus-medium-r-normal--14-140-72-72-c-80-iso8859-1
     endif
 endif
@@ Line 42: / Line 44: @@
 ===== How to enable ctrl+c/ctrl+v/ctrl+a etc in windows =====
   * Add "source $VIMRUNTIME/mswin.vim" into C:\Users\yxue\_vimrc
+<markdown>
+# Tricks
+## Vertical rulers on a specific column
+[Setup a Ruler on a Specific Column in Vim | Baeldung on Linux](https://www.baeldung.com/linux/vim-ruler-on-specific-column)
+In python's [PEP 8](https://peps.python.org/pep-0008/), the maximum line length is limited to 79 (and docstrings/comments to 72). So a vertical indication line is necessary.
+You can add a vertical ruler by typing:
+```
+:set colorcolumn=72,80
+```
+The line's color can be adjusted, `ctermbg` for vim called from terminal while `guibg` for vim called from GUI (which is gvim)
+```
+:highlight colorcolumn ctermbg=lightgrey guibg=lightgrey
+```
+The two lines can be added to `~/.vimrc` for automatic loading. (The # shall be removed.)
+```
+#set colorcolumn=72,80
+highlight colorcolumn ctermbg=lightgrey guibg=lightgrey
+```
+</markdown>

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