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Gracefully handle echotc Co failure

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In Emacs, `M-x shell` creates a shell buffer with very rudimentary
terminal capabilities.  `$TERM` is set to `dumb`, and `echotc Co`
fails after printing `echotc: no such capability: Co` to standard
error.  If our goal was to determine whether the terminal supports 256
colors, we really have no information to go on.  I recommend that we
trust the user and hope for the best.  That means we should (1)
discard any `echotc Co` error output, and (2) forego the warning
message about having fewer than 256 colors if `echotc Co` failed.
This commit is contained in:
Ben Liblit 2017-03-31 23:23:27 -05:00
parent fa21d8fbc9
commit 9444e4c0c6
1 changed files with 2 additions and 2 deletions
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powerlevel9k.zsh-theme
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@ -1317,8 +1317,8 @@ prompt_powerlevel9k_setup() {
# Display a warning if the terminal does not support 256 colors # Display a warning if the terminal does not support 256 colors
local term_colors local term_colors
term_colors=$(echotc Co) term_colors=$(echotc Co 2>/dev/null)
if (( $term_colors < 256 )); then if (( ! $? && ${term_colors:-0} < 256 )); then
print -P "%F{red}WARNING!%f Your terminal appears to support less than 256 colors!" print -P "%F{red}WARNING!%f Your terminal appears to support less than 256 colors!"
print -P "If your terminal supports 256 colors, please export the appropriate environment variable" print -P "If your terminal supports 256 colors, please export the appropriate environment variable"
print -P "_before_ loading this theme in your \~\/.zshrc. In most terminal emulators, putting" print -P "_before_ loading this theme in your \~\/.zshrc. In most terminal emulators, putting"