X-Git-Url: https://feistymeow.org/gitweb/?a=blobdiff_plain;f=scripts%2Fcore%2Ffunctions.sh;h=d88fe6bde290fd538fba1621d2d042177a7ea6e5;hb=d3325c84bb186cdb59a0b77ec95f85bf22d4392b;hp=3a6f9ead8764f0aff1e088ab1625f6d6fa7e2773;hpb=e87d1ce95fb446c4ff733260d186ced5ce0e4964;p=feisty_meow.git diff --git a/scripts/core/functions.sh b/scripts/core/functions.sh index 3a6f9ead..d88fe6bd 100644 --- a/scripts/core/functions.sh +++ b/scripts/core/functions.sh @@ -2,20 +2,26 @@ # This defines some general, useful functions. +#hmmm: starting to get a bit beefy in here. perhaps there is a good way to refactor the functions into more specific folders, if they aren't really totally general purpose? + +############## + # test whether we've been here before or not. skip_all= -function_sentinel &>/dev/null +type function_sentinel &>/dev/null if [ $? -eq 0 ]; then # there was no error, so we can skip the inits. - if [ ! -z "$SHELL_DEBUG" ]; then + if [ ! -z "$DEBUG_FEISTY_MEOW" ]; then echo "skipping function definitions, because already defined." fi skip_all=yes +else + skip_all= fi if [ -z "$skip_all" ]; then - if [ ! -z "$SHELL_DEBUG" ]; then + if [ ! -z "$DEBUG_FEISTY_MEOW" ]; then echo "feisty meow function definitions beginning now..." fi @@ -43,6 +49,8 @@ if [ -z "$skip_all" ]; then return $? } + ############## + # displays the value of a variable in bash friendly format. function var() { HOLDIFS="$IFS" @@ -74,10 +82,34 @@ if [ -z "$skip_all" ]; then echo "$varname=${!varname}" fi fi - done + done | sort IFS="$HOLDIFS" } + ############## + + # when passed a list of things, this will return the unique items from that list as an echo. + function uniquify() + { + # do the uniquification: split the space separated items into separate lines, then + # sort the list, then run the uniq tool on the list. results will be packed back onto + # one line when invoked like: local fredlist="$(uniquify a b c e d a e f a e d b)" + echo $* | tr ' ' '\n' | sort | uniq + } + + # sets the variable in parameter 1 to the value in parameter 2, but only if + # that variable was undefined. + function set_var_if_undefined() + { + local var_name="$1"; shift + local var_value="$1"; shift + if [ -z "${!var_name}" ]; then + eval export $var_name="$var_value" + fi + } + + ############## + function success_sound() { if [ ! -z "$CLAM_FINISH_SOUND" ]; then @@ -92,18 +124,64 @@ if [ -z "$skip_all" ]; then fi } + ############## + + # echoes the maximum number of columns that the terminal supports. usually + # anything you print to the terminal with length less than (but not equal to) + # maxcols will never wrap. + function get_maxcols() + { + # calculate the number of columsn in the terminal. + local cols=$(stty size | awk '{print $2}') + echo $cols + } + + ############## + # checks the result of the last command that was run, and if that failed, # then this complains and exits from bash. the function parameters are # used as the message to print as a complaint. - function check_result() + function test_or_die() { if [ $? -ne 0 ]; then - echo -e "failed on: $*" + echo -e "\n\naction failed: $*\n\nExiting script..." error_sound exit 1 fi } + # like test_or_die, but will keep going after complaining. + function test_or_continue() + { + if [ $? -ne 0 ]; then + echo -e "\n\nerror occurred: $*\n\nContinuing script..." + error_sound + fi + } + + ############## + + # wraps secure shell with some parameters we like, most importantly to enable X forwarding. + function ssh() + { + local args=($*) + # we remember the old terminal title, then force the TERM variable to a more generic + # version for the other side (just 'linux'); we don't want the remote side still + # thinking it's running xterm. + save_terminal_title +#hmmm: why were we doing this? it scorches the user's logged in session, leaving it without proper terminal handling. +# # we save the value of TERM; we don't want to leave the user's terminal +# # brain dead once we come back from this function. +# local oldterm="$TERM" +# export TERM=linux + /usr/bin/ssh -X -C "${args[@]}" +# # restore the terminal variable also. +# TERM="$oldterm" + restore_terminal_title + } + + ############## + # locates a process given a search pattern to match in the process list. # supports a single command line flag style parameter of "-u USERNAME"; # if the -u flag is found, a username is expected afterwards, and only the @@ -127,64 +205,41 @@ if [ -z "$skip_all" ]; then local PID_DUMP="$(mktemp "$TMP/zz_pidlist.XXXXXX")" local -a PIDS_SOUGHT - if [ "$OS" == "Windows_NT" ]; then -#hmmm: windows isn't implementing the user flag yet! -#try collapsing back to the ps implementation from cygwin? -# that would simplify things a lot, if we can get it to print the right output. + if [ "$OS" == "Windows_NT" ]; then + # gets cygwin's (god awful) ps to show windoze processes also. + local EXTRA_DOZER_FLAGS="-W" + # pattern to use for peeling off the process numbers. + local pid_finder_pattern='s/ *\([0-9][0-9]*\) *.*$/\1/p' - # windows case has some odd gyrations to get the user list. - if [ ! -d c:/tmp ]; then - mkdir c:/tmp - fi - # windows7 magical mystery tour lets us create a file c:\\tmp_pids.txt, but then it's not - # really there in the root of drive c: when we look for it later. hoping to fix that - # problem by using a subdir, which also might be magical thinking from windows perspective. - tmppid=c:\\tmp\\pids.txt - # we have abandoned all hope of relying on ps on windows. instead we use wmic to get full - # command lines for processes. - wmic /locale:ms_409 PROCESS get processid,commandline "$tmppid" - local flag='/c' - if [ ! -z "$(uname -a | grep "^MING" )" ]; then - flag='//c' - fi - # we 'type' the file to get rid of the unicode result from wmic. - # needs to be a windows format filename for 'type' to work. - cmd $flag type "$tmppid" >$PID_DUMP - \rm "$tmppid" - local pid_finder_pattern='s/^.*[[:space:]][[:space:]]*\([0-9][0-9]*\) *\$/\1/p' - local i - for i in "${patterns[@]}"; do - PIDS_SOUGHT+=($(cat $PID_DUMP \ - | grep -i "$i" \ - | sed -n -e "$pid_finder_pattern")) - done else - /bin/ps $user_flag -o pid,args >$PID_DUMP + # flags which clean up the process listing output on unixes. + # apparently cygwin doesn't count as a type of unix, because their + # crummy specialized ps command doesn't support normal ps flags. + local EXTRA_UNIX_FLAGS="-o pid,args" + # pattern to use for peeling off the process numbers. + local pid_finder_pattern='s/^[[:space:]]*\([0-9][0-9]*\).*$/\1/p' + fi + + /bin/ps $EXTRA_DOZER_FLAGS $EXTRA_UNIX_FLAGS $user_flag | tail -n +2 >$PID_DUMP #echo ==== #echo got all this stuff in the pid dump file: #cat $PID_DUMP #echo ==== - # pattern to use for peeling off the process numbers. - local pid_finder_pattern='s/^[[:space:]]*\([0-9][0-9]*\).*$/\1/p' - # remove the first line of the file, search for the pattern the - # user wants to find, and just pluck the process ids out of the - # results. - local i - for i in "${patterns[@]}"; do -#echo pattern is $i -#echo phase 1: $(cat $PID_DUMP | sed -e '1d' ) -#echo phase 2: $(cat $PID_DUMP | sed -e '1d' | grep -i "$i" ) - PIDS_SOUGHT+=($(cat $PID_DUMP \ - | sed -e '1d' \ - | grep -i "$i" \ - | sed -n -e "$pid_finder_pattern")) - done + + # search for the pattern the user wants to find, and just pluck the process + # ids out of the results. + local i + for i in "${patterns[@]}"; do + PIDS_SOUGHT+=($(cat $PID_DUMP \ + | grep -i "$i" \ + | sed -n -e "$pid_finder_pattern")) + done #echo ==== #echo pids sought list became: #echo "${PIDS_SOUGHT[@]}" #echo ==== - fi + if [ ${#PIDS_SOUGHT[*]} -ne 0 ]; then local PIDS_SOUGHT2=$(printf -- '%s\n' ${PIDS_SOUGHT[@]} | sort | uniq) PIDS_SOUGHT=() @@ -233,7 +288,7 @@ if [ -z "$skip_all" ]; then # special case for windows. ps | head -1 for curr in $p; do - ps -W | grep "$curr" + ps -W -p $curr | tail -n +2 done else # normal OSes can handle a nice simple query. @@ -242,6 +297,9 @@ if [ -z "$skip_all" ]; then fi } + ############## + +#hmmm: holy crowbars, this is an old one. do we ever still have any need of it? # an unfortunately similarly named function to the above 'ps' as in process # methods, but this 'ps' stands for postscript. this takes a postscript file # and converts it into pcl3 printer language and then ships it to the printer. @@ -255,8 +313,27 @@ if [ -z "$skip_all" ]; then done } - function fix_alsa() { - sudo /etc/init.d/alsasound restart +#hmmm: not really doing anything yet; ubuntu seems to have changed from pulseaudio in 17.04? + # restarts the sound driver. + function fix_sound_driver() { + # stop bash complaining about blank function body. + local nothing= +#if alsa something +# sudo service alsasound restart +#elif pulse something +# sudo pulseaudio -k +# sudo pulseaudio -D +#else +# something else...? +#fi + + } + + function screen() { + save_terminal_title +#hmmm: ugly absolute path here. + /usr/bin/screen $* + restore_terminal_title } # switches from a /X/path form to an X:/ form. this also processes cygwin paths. @@ -311,7 +388,7 @@ if [ -z "$skip_all" ]; then # information for su. # get the x authority info for our current user. - source $FEISTY_MEOW_SCRIPTS/x_win/get_x_auth.sh + source "$FEISTY_MEOW_SCRIPTS/security/get_x_auth.sh" if [ -z "$X_auth_info" ]; then # if there's no authentication info to pass along, we just do a normal su. @@ -326,23 +403,23 @@ if [ -z "$skip_all" ]; then # or at least suse doesn't, which is the other one we've tested on. /bin/su -l $* fi - - # relabel the console after returning. - bash $FEISTY_MEOW_SCRIPTS/tty/label_terminal_with_infos.sh } # sudo function wraps the normal sudo by ensuring we replace the terminal # label if they're doing an su with the sudo. function sudo() { - local first_command="$1" + save_terminal_title /usr/bin/sudo "$@" - if [ "$first_command" == "su" ]; then - # yep, they were doing an su, but they're back now. - bash $FEISTY_MEOW_SCRIPTS/tty/label_terminal_with_infos.sh - fi + retval=$? + restore_terminal_title +# if [ "$first_command" == "su" ]; then +# # yep, they were doing an su, but they're back now. +# label_terminal_with_info +# fi + return $retval } - # trashes the .#blah files that cvs and svn leave behind when finding conflicts. + # trashes the .#blah files that cvs and subversion leave behind when finding conflicts. # this kind of assumes you've already checked them for any salient facts. function clean_cvs_junk() { for i in $*; do @@ -356,7 +433,8 @@ if [ -z "$skip_all" ]; then if [ -z "$wheres_nechung" ]; then echo "The nechung oracle program cannot be found. You may want to consider" echo "rebuilding the feisty meow applications with this command:" - echo "bash $FEISTY_MEOW_SCRIPTS/generator/bootstrap_build.sh" + echo "bash $FEISTY_MEOW_SCRIPTS/generator/produce_feisty_meow.sh" + echo else $wheres_nechung fi @@ -365,92 +443,117 @@ if [ -z "$skip_all" ]; then # recreates all the generated files that the feisty meow scripts use. function regenerate() { # do the bootstrapping process again. + save_terminal_title echo "regenerating feisty meow script environment." - bash $FEISTY_MEOW_SCRIPTS/core/bootstrap_shells.sh + bash $FEISTY_MEOW_SCRIPTS/core/reconfigure_feisty_meow.sh echo - # force a full reload by turning off sentinel variable and alias. - # the nethack one is used by fred's customizations. - # interesting note perhaps: found that the NETHACKOPTIONS variable was - # not being unset correctly when preceded by an alias. split them up - # like they are now due to that bug. - unset -v CORE_ALIASES_LOADED FEISTY_MEOW_LOADING_DOCK NECHUNG NETHACKOPTIONS + # force a full reload by turning off sentinel variables and methods. + unset -v CORE_VARIABLES_LOADED FEISTY_MEOW_LOADING_DOCK USER_CUSTOMIZATIONS_LOADED + unalias CORE_ALIASES_LOADED &>/dev/null unset -f function_sentinel # reload feisty meow environment in current shell. - source $FEISTY_MEOW_SCRIPTS/core/launch_feisty_meow.sh + source "$FEISTY_MEOW_SCRIPTS/core/launch_feisty_meow.sh" # run nechung oracle to give user a new fortune. nechung - } - - # generates a random password where the first parameter is the number of characters - # in the password (default 20) and the second parameter specifies whether to use - # special characters (1) or not (0). - # found function at http://legroom.net/2010/05/06/bash-random-password-generator - function random_password() - { - [ "$2" == "0" ] && CHAR="[:alnum:]" || CHAR="[:graph:]" - cat /dev/urandom | tr -cd "$CHAR" | head -c ${1:-32} - echo - } - - # a wrapper for the which command that finds items on the path. some OSes - # do not provide which, so we want to not be spewing errors when that - # happens. - function whichable() - { - to_find="$1"; shift - which which &>/dev/null - if [ $? -ne 0 ]; then - # there is no which command here. we produce nothing due to this. - echo - fi - echo $(which $to_find) + restore_terminal_title } # copies a set of custom scripts into the proper location for feisty meow # to merge their functions and aliases with the standard set. function recustomize() { - user="$1"; shift - if [ -z "$user" ]; then + local custom_user="$1"; shift + if [ -z "$custom_user" ]; then # use our default example user if there was no name provided. - user=fred + custom_user=fred fi - if [ ! -d "$FEISTY_MEOW_DIR/customizing/$user" ]; then - echo "The customization folder provided for $user should be:" - echo " '$FEISTY_MEOW_DIR/customizing/$user'" + + save_terminal_title + + if [ ! -d "$FEISTY_MEOW_SCRIPTS/customize/$custom_user" ]; then + echo "The customization folder provided for $custom_user should be:" + echo " '$FEISTY_MEOW_SCRIPTS/customize/$custom_user'" echo "but that folder does not exist. Skipping customization." return 1 fi + + # prevent permission foul-ups. +#hmmm: save error output here instead of muting it. +#hmmm: better yet actually, just don't complain on freaking cygwin, since that's where this happens + chown -R "$(logname):$(logname)" \ + "$FEISTY_MEOW_LOADING_DOCK"/* "$FEISTY_MEOW_GENERATED_STORE"/* 2>/dev/null + test_or_continue "chowning to $(logname) didn't happen." + regenerate >/dev/null pushd "$FEISTY_MEOW_LOADING_DOCK/custom" &>/dev/null - local incongruous_files="$(bash "$FEISTY_MEOW_SCRIPTS/files/list_non_dupes.sh" "$FEISTY_MEOW_DIR/customizing/$user" "$FEISTY_MEOW_LOADING_DOCK/custom")" + incongruous_files="$(bash "$FEISTY_MEOW_SCRIPTS/files/list_non_dupes.sh" "$FEISTY_MEOW_SCRIPTS/customize/$custom_user" "$FEISTY_MEOW_LOADING_DOCK/custom")" -#echo "the incongruous files list is: $incongruous_files" + local fail_message="\nare the perl dependencies installed? if you're on ubuntu or debian, try this:\n + $(grep "apt.*perl" $FEISTY_MEOW_APEX/readme.txt)\n" + + #echo "the incongruous files list is: $incongruous_files" # disallow a single character result, since we get "*" as result when nothing exists yet. if [ ${#incongruous_files} -ge 2 ]; then echo "cleaning unknown older overrides..." perl "$FEISTY_MEOW_SCRIPTS/files/safedel.pl" $incongruous_files + test_or_continue "running safedel. $fail_message" echo fi popd &>/dev/null - echo "copying custom overrides for $user" + echo "copying custom overrides for $custom_user" mkdir -p "$FEISTY_MEOW_LOADING_DOCK/custom" 2>/dev/null - perl "$FEISTY_MEOW_SCRIPTS/text/cpdiff.pl" "$FEISTY_MEOW_DIR/customizing/$user" "$FEISTY_MEOW_LOADING_DOCK/custom" - if [ -d "$FEISTY_MEOW_DIR/customizing/$user/scripts" ]; then - echo "copying custom scripts for $user" - \cp -R "$FEISTY_MEOW_DIR/customizing/$user/scripts" "$FEISTY_MEOW_LOADING_DOCK/custom/" + perl "$FEISTY_MEOW_SCRIPTS/text/cpdiff.pl" "$FEISTY_MEOW_SCRIPTS/customize/$custom_user" "$FEISTY_MEOW_LOADING_DOCK/custom" + test_or_continue "running cpdiff. $fail_message" + + if [ -d "$FEISTY_MEOW_SCRIPTS/customize/$custom_user/scripts" ]; then + echo "copying custom scripts for $custom_user" + netcp "$FEISTY_MEOW_SCRIPTS/customize/$custom_user/scripts" "$FEISTY_MEOW_LOADING_DOCK/custom/" &>/dev/null +#hmmm: could save output to show if an error occurs. fi echo regenerate + + # prevent permission foul-ups, again. + chown -R "$(logname):$(logname)" "$FEISTY_MEOW_LOADING_DOCK" "$FEISTY_MEOW_GENERATED_STORE" + + restore_terminal_title + } + + # generates a random password where the first parameter is the number of characters + # in the password (default 20) and the second parameter specifies whether to use + # special characters (1) or not (0). + # found function at http://legroom.net/2010/05/06/bash-random-password-generator + function random_password() + { + [ "$2" == "0" ] && CHAR="[:alnum:]" || CHAR="[:graph:]" + cat /dev/urandom | tr -cd "$CHAR" | head -c ${1:-32} + echo + } + + # a wrapper for the which command that finds items on the path. some OSes + # do not provide which, so we want to not be spewing errors when that + # happens. + function whichable() + { + to_find="$1"; shift + which which &>/dev/null + if [ $? -ne 0 ]; then + # there is no which command here. we produce nothing due to this. + echo + fi + echo $(which $to_find) } -#uhhh, this does what now? +#hmmm: improve this by not adding the link +# if already there, or if the drive is not valid. function add_cygwin_drive_mounts() { for i in c d e f g h q z ; do ln -s /cygdrive/$i $i done } + ############################ + # takes a file to modify, and then it will replace any occurrences of the # pattern provided as the second parameter with the text in the third # parameter. @@ -467,6 +570,103 @@ if [ -z "$skip_all" ]; then sed -i -e "s%$pattern%$replacement%g" "$file" } + # similar to replace_pattern_in_file, but also will add the new value + # when the old one did not already exist in the file. + function replace_if_exists_or_add() + { + local file="$1"; shift + local phrase="$1"; shift + local replacement="$1"; shift + if [ -z "$file" -o ! -f "$file" -o -z "$phrase" -o -z "$replacement" ]; then + echo "replace_if_exists_or_add: needs a filename, a phrase to replace, and the" + echo "text to replace that phrase with." + return 1 + fi + grep "$phrase" "$file" >/dev/null + # replace if the phrase is there, otherwise add it. + if [ $? -eq 0 ]; then + replace_pattern_in_file "$file" "$phrase" "$replacement" + else + # this had better be the complete line. + echo "$replacement" >>"$file" + fi + } + + ############################ + + # finds a variable (first parameter) in a particular property file + # (second parameter). the expected format for the file is: + # varX=valueX + function seek_variable() + { + local find_var="$1"; shift + local file="$1"; shift + if [ -z "$find_var" -o -z "$file" -o ! -f "$file" ]; then + echo -e "seek_variable: needs two parameters, firstly a variable name, and\nsecondly a file where the variable's value will be sought." 1>&2 + return 1 + fi + + while read line; do + if [ ${#line} -eq 0 ]; then continue; fi + # split the line into the variable name and value. + IFS='=' read -a assignment <<< "$line" + local var="${assignment[0]}" + local value="${assignment[1]}" + if [ "${value:0:1}" == '"' ]; then + # assume the entry was in quotes and remove them. + value="${value:1:$((${#value} - 2))}" + fi + if [ "$find_var" == "$var" ]; then + echo "$value" + fi + done < "$file" + } + + # finds a variable (first parameter) in a particular XML format file + # (second parameter). the expected format for the file is: + # ... name="varX" value="valueX" ... + function seek_variable_in_xml() + { + local find_var="$1"; shift + local file="$1"; shift + if [ -z "$find_var" -o -z "$file" -o ! -f "$file" ]; then + echo "seek_variable_in_xml: needs two parameters, firstly a variable name, and" + echo "secondly an XML file where the variable's value will be sought." + return 1 + fi + + while read line; do + if [ ${#line} -eq 0 ]; then continue; fi + # process the line to make it more conventional looking. + line="$(echo "$line" | sed -e 's/.*name="\([^"]*\)" value="\([^"]*\)"/\1=\2/')" + # split the line into the variable name and value. + IFS='=' read -a assignment <<< "$line" + local var="${assignment[0]}" + local value="${assignment[1]}" + if [ "${value:0:1}" == '"' ]; then + # assume the entry was in quotes and remove them. + value="${value:1:$((${#value} - 2))}" + fi + if [ "$find_var" == "$var" ]; then + echo "$value" + fi + done < "$file" + } + + ############################ + + # goes to a particular directory passed as parameter 1, and then removes all + # the parameters after that from that directory. + function push_whack_pop() + { + local dir="$1"; shift + pushd "$dir" &>/dev/null + if [ $? -ne 0 ]; then echo failed to enter dir--quitting.; fi + rm -rf $* &>/dev/null + if [ $? -ne 0 ]; then echo received a failure code when removing.; fi + popd &>/dev/null + } + function spacem() { while [ $# -gt 0 ]; do @@ -532,31 +732,225 @@ alias "${@}" return 0 } - # defines a variable within the feisty meow environment and remembers that - # this is a new or modified definition. if the feisty meow codebase is - # unloaded, then so are all the variables that were defined. - # this function always exports the variables it defines. -# function define_yeti_variable() -# { -## if variable exists already, save old value for restore, -## otherwise save null value for restore, -## have to handle unsetting if there was no prior value of one -## we newly defined. -## add variable name to a list of feisty defined variables. -# -##hmmm: first implem just sets it up and exports the variable. -## i.e., this method always exports. -#export "${@}" -# -# -#return 0 -# } + ############## + +#hmmm: this points to an extended functions file being needed; not all of these are core. + + # displays documentation in "md" formatted files. + function show_md() + { + local file="$1"; shift + pandoc "$file" | lynx -stdin + } + + ############## + + # just shows a separator line for an 80 column console, or uses the first + # parameter as the number of columns to expect. + function separator() + { + count=$1; shift + if [ -z "$count" ]; then + count=79 + fi + echo + local i + for ((i=0; i < $count - 1; i++)); do + echo -n "=" + done + echo + echo + } + # alias for separator. + function sep() + { + separator $* + } ############## - function function_sentinel() { return 0; } + # count the number of sub-directories in a directory and echo the result. + function count_directories() + { + local appsdir="$1"; shift + numdirs="$(find "$appsdir" -mindepth 1 -maxdepth 1 -type d | wc -l)" + echo $numdirs + } + + # takes a string and capitalizes just the first character. any capital letters in the remainder of + # the string are made lower case. the processed string is returned by an echo. + function capitalize_first_char() + { + local to_dromedary="$1"; shift + to_dromedary="$(tr '[:lower:]' '[:upper:]' <<< ${to_dromedary:0:1})$(tr '[:upper:]' '[:lower:]' <<< ${to_dromedary:1})" + echo "$to_dromedary" + } + + # given a source path and a target path, this will make a symbolic link from + # the source to the destination, but only if the source actually exists. + function make_safe_link() + { + local src="$1"; shift + local target="$1"; shift - if [ ! -z "$SHELL_DEBUG" ]; then echo "feisty meow function definitions done."; fi + if [ -d "$src" ]; then + ln -s "$src" "$target" + test_or_die "Creating symlink from '$src' to '$target'" + fi + echo "Created symlink from '$src' to '$target'." + } + + # pretty prints the json files provided as parameters. + function clean_json() + { + if [ -z "$*" ]; then return; fi + local show_list=() + while true; do + local file="$1"; shift + if [ -z "$file" ]; then break; fi + if [ ! -f "$file" ]; then "echo File '$file' does not exist."; continue; fi + temp_out="$TMP/$file.view" + cat "$file" | python -m json.tool > "$temp_out" + show_list+=($temp_out) + test_or_continue "pretty printing '$file'" + done + filedump "${show_list[@]}" + rm "${show_list[@]}" + } + + function json_text() + { + # only print our special headers or text fields. + local CR=$'\r' + local LF=$'\n' + clean_json $* | + grep -i "\"text\":\|^=.*" | + sed -e "s/\\\\r/$CR/g" -e "s/\\\\n/\\$LF/g" + } + + ############## + + # echoes the machine's hostname. can be used like so: + # local my_host=$(get_hostname) + function get_hostname() + { + # there used to be more variation in how to do this, but adopting mingw + # and cygwin tools really helped out. + local this_host=unknown + if [ "$OS" == "Windows_NT" ]; then + this_host=$(hostname) + elif [ ! -z "$(echo $MACHTYPE | grep apple)" ]; then + this_host=$(hostname) + elif [ ! -z "$(echo $MACHTYPE | grep suse)" ]; then + this_host=$(hostname --long) + elif [ -x "$(which hostname 2>/dev/null)" ]; then + this_host=$(hostname) + fi + echo "$this_host" + } + + # makes sure that the provided "folder" is a directory and is writable. + function test_writeable() + { + local folder="$1"; shift + if [ ! -d "$folder" -o ! -w "$folder" ]; then return 1; fi + return 0 + } + + ############## + + # given a filename and a string to seek and a number of lines, then this + # function will remove the first occurrence of a line in the file that + # matches the string, and it will also axe the next N lines as specified. + function create_chomped_copy_of_file() + { + local filename="$1"; shift + local seeker="$1"; shift + local numlines=$1; shift + +#echo into create_chomped_copy... +#var filename seeker numlines + + # make a backup first, oy. + \cp -f "$filename" "/tmp/$(basename ${filename}).bkup-${RANDOM}" + test_or_die "backing up file: $filename" + + # make a temp file to write to before we move file into place in bind. + local new_version="/tmp/$(basename ${filename}).bkup-${RANDOM}" + \rm -f "$new_version" + test_or_die "cleaning out new version of file from: $new_version" + + local line + local skip_count=0 + local found_any= + while read line; do + # don't bother looking at the lines if we're already in skip mode. + if [[ $skip_count == 0 ]]; then + # find the string they're seeking. + if [[ ! "$line" =~ .*${seeker}.* ]]; then + # no match. + echo "$line" >> "$new_version" + else + # a match! start skipping. we will delete this line and the next N lines. + ((skip_count++)) +#echo first skip count is now $skip_count + found_any=yes + fi + else + # we're already skipping. let's keep going until we hit the limit. + ((skip_count++)) +#echo ongoing skip count is now $skip_count + if (( $skip_count > $numlines )); then + echo "Done skipping, and back to writing output file." + skip_count=0 + fi + fi + done < "$filename" + +#echo file we created looks like this: +#cat "$new_version" + + if [ ! -z "$found_any" ]; then + # put the file back into place under the original name. + \mv "$new_version" "$filename" + test_or_die "moving the new version into place in: $filename" + else + # cannot always be considered an error, but we can at least gripe. + echo "Did not find any matches for seeker '$seeker' in file: $filename" + fi + } + + ############## + + # NOTE: no more function definitions are allowed after this point. + + function function_sentinel() + { + return 0; + } + if [ ! -z "$DEBUG_FEISTY_MEOW" ]; then echo "feisty meow function definitions done."; fi + + ############## + + # test code for set_var_if_undefined. + run_test=0 + if [ $run_test != 0 ]; then + echo running tests on set_var_if_undefined. + flagrant=petunia + set_var_if_undefined flagrant forknordle + test_or_die "testing if defined variable would be whacked" + if [ $flagrant != petunia ]; then + echo set_var_if_undefined failed to leave the test variable alone + exit 1 + fi + unset bobblehead_stomper + set_var_if_undefined bobblehead_stomper endurance + if [ $bobblehead_stomper != endurance ]; then + echo set_var_if_undefined failed to set a variable that was not defined yet + exit 1 + fi + fi + fi