Gerenciador de pacotes do Arch Linux,pacman, gera resultados de pesquisa com cada resultado abrangendo duas linhas:
~ % pacman -Ss cowsay
extra/cowsay 3.04-2
Configurable talking cow (and a few other creatures)
community/ponysay 3.0.3-4
cowsay reimplemention for ponies
Existem maneiras de executar o grep nessa saída ( grep -C 1, etc), mas prefiro encerrar a chamada e canalizar a saída por meio de paste - - | column -s $'\t' -t. Isso deixa cada resultado da pesquisa em sua própria linha:
~ % pacman -Ss cowsay
community/ponysay 3.0.3-4 (1.3 MiB 10.7 MiB) cowsay reimplemention for ponies
extra/cowsay 3.04-2 (19.5 KiB 38.2 KiB) Configurable talking cow (and a few other creatures)
Até agora tudo bem. Mas também uso uma ferramenta chamadayay, que é essencialmente um wrapper pacman, com funcionalidade adicional para gerenciar pacotes noRepositório de usuários Arch(AUR). yayinclui um comando interativo de pesquisa/instalação que é acionado apenas passando um termo de pesquisa sem outras opções:
~ % yay cowsay
15 aur/ponysay-free 3.0.2-1 (+1 0.00)
Awesome cowsay reimplemention with ponies for ponies. Only free ponies edition
[...]
4 aur/xcowsay 1.5.1-1 (+17 0.38)
a program based on cowsay that displays a cute cow and message on your desktop
3 aur/muccadoro 1.0.1-1 (+1 0.79)
Pomodoro timer using figlet, cowsay, and optionally lolcat
2 community/ponysay 3.0.3-4 (1.3 MiB 10.7 MiB)
cowsay reimplemention for ponies
1 extra/cowsay 3.04-2 (19.5 KiB 38.2 KiB)
Configurable talking cow (and a few other creatures)
==> Packages to install (eg: 1 2 3, 1-3 or ^4)
==> 1
resolving dependencies...
looking for conflicting packages...
Package (1) New Version Net Change Download Size
extra/cowsay 3.04-2 0.04 MiB 0.02 MiB
Total Download Size: 0.02 MiB
Total Installed Size: 0.04 MiB
:: Proceed with installation? [Y/n] Y
:: Retrieving packages...
cowsay-3.04-2-any 19.5 KiB 49.5 KiB/s 00:00 [#######################################################] 100%
(1/1) checking keys in keyring [#######################################################] 100%
(1/1) checking package integrity
[...]
Por uma questão de uniformidade, eu esperava aplicar minha correção de resultado de pesquisa a esta função também, mas a interatividade e o fato de haver linhas sem quebras de linha ( ==>) exigem algumas abordagens diferentes.
Preciso alterar apenas a parte dos resultados da pesquisa e, em seguida, passar diretamente pelo restante do script.
Eu escrevi um pequeno script perl que é parecido com o meu paste/ column, mas com um kill switch:
#!/usr/bin/perl
$thru = 0;
while (<>) {
if ( $thru == 1 || m/Packages to install / ) {
$thru = 1;
} else {
chomp unless (m/^ /);
s/^\s+/\t/;
}
print;
}
Mas quando canalizo a saída por meio disso, perco as barras de progresso e o texto antes dos prompts.
Aqui está uma diferença:
--- correctnot.txt 2021-10-29 15:09:43.645632751 -0500
+++ correct.txt 2021-10-29 15:09:43.655632810 -0500
@@ -1,22 +1,22 @@
==> Packages to install (eg: 1 2 3, 1-3 or ^4)
-1
-==> resolving dependencies...
+==> 1
+resolving dependencies...
looking for conflicting packages...
-:: Proceed with installation? [Y/n]
+
Package (1) New Version Net Change
extra/cowsay 3.04-2 0.04 MiB
Total Installed Size: 0.04 MiB
-Y
-checking keyring...
-checking package integrity...
-loading package files...
-checking for file conflicts...
-checking available disk space...
+:: Proceed with installation? [Y/n] Y
+(1/1) checking keys in keyring [#######################################################] 100%
+(1/1) checking package integrity [#######################################################] 100%
+(1/1) loading package files [#######################################################] 100%
+(1/1) checking for file conflicts [#######################################################] 100%
+(1/1) checking available disk space [#######################################################] 100%
:: Processing package changes...
-installing cowsay...
+(1/1) installing cowsay [#######################################################] 100%
:: Running post-transaction hooks...
(1/3) Arming ConditionNeedsUpdate...
(2/3) Refreshing PackageKit...
Em outra tentativa, recriei tudo antes do primeiro prompt e depois passei a resposta para uma segunda chamada:
echo q |
/usr/bin/yay "$@" |
perl -pe 'if ( m/Packages to install / ) { print; s/Packages to install.*//; chomp; print; exit; } chomp unless (m/^ /); s/^\s+/\t/'
read answer
echo "$answer" | exec /usr/bin/yay "$@"
A saída:
15 aur/ponysay-free 3.0.2-1 (+1 0.00) Awesome cowsay reimplemention with ponies for ponies. Only free ponies edition
[...]
4 aur/xcowsay 1.5.1-1 (+17 0.38) a program based on cowsay that displays a cute cow and message on your desktop
3 aur/muccadoro 1.0.1-1 (+1 0.79) Pomodoro timer using figlet, cowsay, and optionally lolcat
2 community/ponysay 3.0.3-4 (1.3 MiB 10.7 MiB) cowsay reimplemention for ponies
1 extra/cowsay 3.04-2 (19.5 KiB 38.2 KiB) Configurable talking cow (and a few other creatures)
==> Packages to install (eg: 1 2 3, 1-3 or ^4)
==> 1
15 aur/ponysay-free 3.0.2-1 (+1 0.00)
Awesome cowsay reimplemention with ponies for ponies. Only free ponies edition
[...]
4 aur/xcowsay 1.5.1-1 (+17 0.38)
a program based on cowsay that displays a cute cow and message on your desktop
3 aur/muccadoro 1.0.1-1 (+1 0.79)
Pomodoro timer using figlet, cowsay, and optionally lolcat
2 community/ponysay 3.0.3-4 (1.3 MiB 10.7 MiB)
cowsay reimplemention for ponies
1 extra/cowsay 3.04-2 (19.5 KiB 38.2 KiB)
Configurable talking cow (and a few other creatures)
==> Packages to install (eg: 1 2 3, 1-3 or ^4)
==> resolving dependencies...
looking for conflicting packages...
Package (1) New Version Net Change
extra/cowsay 3.04-2 0.04 MiB
Total Installed Size: 0.04 MiB
:: Proceed with installation? [Y/n] -> exit status 1
Começa bem, mas gera os resultados duas vezes e tive que executar o comando duas vezes. Não vá.
Nota lateral: provavelmente devo mencionar que o retorno do investimento é muito baixo aqui. Por que eu iria querer usar uma lista interativa? Neste ponto, eu poderia simplesmente bifurcar yaye excluir \nda minha cópia (eu fiz. Mas ainda estou curioso: existe uma maneira simples de alterar a saída de um programa interativo como este?