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authorLewis Russell <lewis6991@gmail.com>2023-02-01 17:21:42 +0000
committerGitHub <noreply@github.com>2023-02-01 17:21:42 +0000
commit9ce44a750c2a65082962effe6ce4d185b7698d73 (patch)
tree3fb2dff57e50748829759f4d6adb42bf60830ae7 /runtime/lua/man.lua
parent4cc0d6b854b44c0b8466e0a84bbc9e350cda8c4f (diff)
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fix(man): use italics for `<bs>_` (#22086)
fix(man): use italics for <bs>_ Even though underline is strictly what this should be. <bs>_ was used by nroff to indicate italics which wasn't possible on old typewriters so underline was used. Modern terminals now support italics so lets use that now. See: - https://unix.stackexchange.com/questions/274658/purpose-of-ascii-text-with-overstriking-file-format/274795#274795 - https://cmd.inp.nsk.su/old/cmd2/manuals/unix/UNIX_Unleashed/ch08.htm
Diffstat (limited to 'runtime/lua/man.lua')
-rw-r--r--runtime/lua/man.lua16
1 files changed, 11 insertions, 5 deletions
diff --git a/runtime/lua/man.lua b/runtime/lua/man.lua
index 732a4ab92e..0956022ac6 100644
--- a/runtime/lua/man.lua
+++ b/runtime/lua/man.lua
@@ -149,15 +149,21 @@ local function highlight_line(line, linenr)
if overstrike then
local last_hl = hls[#hls]
if char == prev_char then
- if char == '_' and attr == UNDERLINE and last_hl and last_hl.final == byte then
- -- This underscore is in the middle of an underlined word
- attr = UNDERLINE
+ if char == '_' and attr == ITALIC and last_hl and last_hl.final == byte then
+ -- This underscore is in the middle of an italic word
+ attr = ITALIC
else
attr = BOLD
end
elseif prev_char == '_' then
- -- char is underlined
- attr = UNDERLINE
+ -- Even though underline is strictly what this should be. <bs>_ was used by nroff to
+ -- indicate italics which wasn't possible on old typewriters so underline was used. Modern
+ -- terminals now support italics so lets use that now.
+ -- See:
+ -- - https://unix.stackexchange.com/questions/274658/purpose-of-ascii-text-with-overstriking-file-format/274795#274795
+ -- - https://cmd.inp.nsk.su/old/cmd2/manuals/unix/UNIX_Unleashed/ch08.htm
+ -- attr = UNDERLINE
+ attr = ITALIC
elseif prev_char == '+' and char == 'o' then
-- bullet (overstrike text '+^Ho')
attr = BOLD