Add many print helpers (#523)

* Add many print helpers

* Typo fix

data/helpers.d/print

@@ -8,12 +8,11 @@ ynh_die() {
 # Display a message in the 'INFO' logging category
 #
 # usage: ynh_info "Some message"
-ynh_info()
+ynh_print_info() {
-{
     echo "$1" >> "$YNH_STDINFO"
 }
 
-# Ignore the yunohost-cli log to prevent errors with conditionals commands
+# Ignore the yunohost-cli log to prevent errors with conditional commands
 #
 # [internal]
 #
@@ -29,3 +28,99 @@ ynh_no_log() {
   sudo mv ${ynh_cli_log}-move ${ynh_cli_log}
   return $?
 }
+
+# Main printer, just in case in the future we have to change anything about that.
+#
+# [internal]
+#
+ynh_print_log () {
+  echo -e "${1}"
+}
+
+# Print a warning on stderr
+#
+# usage: ynh_print_warn "Text to print"
+# | arg: text - The text to print
+ynh_print_warn () {
+  ynh_print_log "\e[93m\e[1m[WARN]\e[0m ${1}" >&2
+}
+
+# Print an error on stderr
+#
+# usage: ynh_print_err "Text to print"
+# | arg: text - The text to print
+ynh_print_err () {
+  ynh_print_log "\e[91m\e[1m[ERR]\e[0m ${1}" >&2
+}
+
+# Execute a command and print the result as an error
+#
+# usage: ynh_exec_err command to execute
+# usage: ynh_exec_err "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be sent to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_err () {
+	ynh_print_err "$(eval $@)"
+}
+
+# Execute a command and print the result as a warning
+#
+# usage: ynh_exec_warn command to execute
+# usage: ynh_exec_warn "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be sent to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_warn () {
+	ynh_print_warn "$(eval $@)"
+}
+
+# Execute a command and force the result to be printed on stdout
+#
+# usage: ynh_exec_warn_less command to execute
+# usage: ynh_exec_warn_less "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be sent to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_warn_less () {
+	eval $@ 2>&1
+}
+
+# Execute a command and redirect stdout in /dev/null
+#
+# usage: ynh_exec_quiet command to execute
+# usage: ynh_exec_quiet "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be sent to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_quiet () {
+	eval $@ > /dev/null
+}
+
+# Execute a command and redirect stdout and stderr in /dev/null
+#
+# usage: ynh_exec_fully_quiet command to execute
+# usage: ynh_exec_fully_quiet "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be sent to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_fully_quiet () {
+	eval $@ > /dev/null 2>&1
+}
+
+# Remove any logs for all the following commands.
+#
+# usage: ynh_print_OFF
+# WARNING: You should be careful with this helper, and never forget to use ynh_print_ON as soon as possible to restore the logging.
+ynh_print_OFF () {
+	set +x
+}
+
+# Restore the logging after ynh_print_OFF
+#
+# usage: ynh_print_ON
+ynh_print_ON () {
+	set -x
+	# Print an echo only for the log, to be able to know that ynh_print_ON has been called.
+	echo ynh_print_ON > /dev/null
+}