GNU screenのcaptionとhardstatusの整理

GNU screenではWindow事のcaptionや各Window情報を下に表示したりするhardstatusが設定できますが長い表示を書くときに整理する方法について。

setenvを用いて1つずつ加えていく

setenvを用いて1つずつ加えていく

GNU screenではsetenvを使って変数が定義できるので、これを使ってどんどん付け足していくだけです。

screenのcaption/hardstatusにおける文法は結構特殊な物が多いので、自分でも忘れないためにメモを書いておきたいわけですが、以前は一行captionを書いて、その下に一つ一つの文字の意味を書き足してました ¹。

それを、下の様にsetenvを用いると、説明と設定が一緒にできます。書き換える時も直接上下させたり付け加えたりするだけなので説明の書き忘れもありません。

~/.screenrc

# Caption for each window
setenv a ""
setenv a "$a%?%F"     # if the window has the focus
setenv a "$a%{=d Wk}" #   set attribute = {dim, black(k) on bright Write(W)}
setenv a "$a%:"       # else
setenv a "$a%{=d Kk}" #   set attribute = {dim, black(k) on bright Black(K)}
setenv a "$a%?"       # end if
setenv a "$a%?%P"     # if copy/paste mode
setenv a "$a%{=d Bk}" #   set attribute = {dim, black(k) on bright Blue(B)}
setenv a "$a%?"       # end if
setenv a "$a%n"       # window number
setenv a "$a "        # space
setenv a "$a%L="      # Mark the position for the next truncation
setenv a "$a%h"       # window' hardstatus
setenv a "$a%L>"      # Truncate %L= ~ %L>, 'L' for > gives marks at the truncation point
setenv a "$a%="       # With the last %-0=, it makes right alignment for following lines
setenv a "$a%?%P"     # if copy/paste mode
setenv a "$a  *copy/paste*" # draw this sentence
setenv a "$a%?"       # end if
setenv a "$a%?%E"     # if copy/paste mode
setenv a "$a  ***command**" # draw this sentence
setenv a "$a%?"       # end if
setenv a "$a%-0="     # pad the string to the display's width. "-0" means
                      # start from the rightest side
                      # (e.g. 10=: 10% from left, 010, 10 characters from left
                      # (     -10=: 10% from right)
                      # With %L>, %= above, screen tries to truncates the part 
                      # in the left of "%L>"
caption always "$a"
unsetenv a

# hardstatus
setenv a ""
setenv a "$a%{= Kk}" # set attribute = {black(k) on bright Black(K)}
setenv a "$a%-w"     # windows' list up to the current window (shown as "%n %t")
setenv a "$a%40>"    # Mark here as a point to move when truncation
                     # Try to move this point to the 40% point
setenv a "$a%{= Wk}" # set attribute = {black(k) on bright Write(W)}
setenv a "$a%n"      # current window number
setenv a "$a "       # space
setenv a "$a%t"      # current window title
setenv a "$a%{-}"    # remove the set from the current attributes
setenv a "$a%+w"     # windows' list starting with the window after the current one (shown as "%n %t")
setenv a "$a%-0="    # pad the string to the display's width.
                     # About Truncation/Padding(=,<,>)
                     # http://aperiodic.net/screen/truncation_padding_escapes
hardstatus alwayslastline "$a"
unsetenv a