Add existing scripts
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# Note: this script should be sourced into your shell. For this reason it does
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# not specify a shebang.
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#
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# set-ps1: set the command prompt (PS1) variable to a named 'theme'.
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#
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# example:
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#
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# set-ps1 simple
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#
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# If no 'theme' is provided, the original PS1 value that was set in the shell
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# startup files is used.
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# Keep track of the original PS1 value.
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_original_ps1="${PS1}"
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set_ps1() {
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# Foreground colours.
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local fg_black=$(tput setaf 0) # \033[30m
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local fg_red=$(tput setaf 1) # \033[31m
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local fg_green=$(tput setaf 2) # \033[32m
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local fg_yellow=$(tput setaf 3) # \033[33m
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local fg_blue=$(tput setaf 4) # \033[34m
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local fg_magenta=$(tput setaf 5) # \033[35m
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local fg_cyan=$(tput setaf 6) # \033[36m
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local fg_white=$(tput setaf 7) # \033[37m
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# Background colours.
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local bg_black=$(tput setab 0) # \033[40m
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local bg_red=$(tput setab 1) # \033[41m
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local bg_green=$(tput setab 2) # \033[42m
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local bg_yellow=$(tput setab 3) # \033[43m
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local bg_blue=$(tput setab 4) # \033[44m
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local bg_magenta=$(tput setab 5) # \033[45m
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local bg_cyan=$(tput setab 6) # \033[46m
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local bg_white=$(tput setab 7) # \033[47m
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# Text styles and reset. Note that on some terminals 'bold' will produce
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# light colours for bright colours, on others it will actually show the text
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# in bold.
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local bold=$(tput bold) # \033[1m
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local dim=$(tput dim) # \033[2m
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local start_underline=$(tput smul) # \033[4m
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local stop_underline=$(tput rmul) # \033[24m
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local reset=$(tput sgr0) # \033[0m
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# If you need them, you can get other terminal capabilties such as the
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# number of colours, lines, columns, etc.
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local colors=$(tput colors) # Number of colours, e.g. '8' or '256'
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local lines=$(tput lines) # Number of lines in the terminal
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local cols=$(tput cols) # Number of columns in the terminal
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# Special characters for PS1 strings:
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# \a an ASCII bell character (07)
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# \d the date in "Weekday Month Date" format (e.g., "Tue May 26")
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# \D{format}
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# the format is passed to strftime(3) and the result is inserted into the prompt string; an empty format results in a locale-specific time representation. The
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# braces are required
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# \e an ASCII escape character (033)
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# \h the hostname up to the first `.'
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# \H the hostname
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# \j the number of jobs currently managed by the shell
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# \l the basename of the shell's terminal device name
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# \n newline
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# \r carriage return
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# \s the name of the shell, the basename of $0 (the portion following the final slash)
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# \t the current time in 24-hour HH:MM:SS format
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# \T the current time in 12-hour HH:MM:SS format
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# \@ the current time in 12-hour am/pm format
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# \A the current time in 24-hour HH:MM format
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# \u the username of the current user
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# \v the version of bash (e.g., 2.00)
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# \V the release of bash, version + patch level (e.g., 2.00.0)
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# \w the current working directory, with $HOME abbreviated with a tilde (uses the value of the PROMPT_DIRTRIM variable)
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# \W the basename of the current working directory, with $HOME abbreviated with a tilde
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# \! the history number of this command
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# \# the command number of this command
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# \$ if the effective UID is 0, a #, otherwise a $
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# \nnn the character corresponding to the octal number nnn
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# \\ a backslash
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# \[ begin a sequence of non-printing characters, which could be used to embed a terminal control sequence into the prompt
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# \] end a sequence of non-printing characters
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# Depending on the name of the theme provided, set the prompt.
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case $1 in
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basic)
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# Debian/Ubuntu style:
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# \u@\h - username@host
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# \w - working directory
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# \$ - prompt
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PS1="\u@\h:\w\\$ "
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;;
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debian)
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# Debian/Ubuntu style:
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# \u@\h - username@host (bold/green)
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# \w - working directory (bold/blue)
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# \$ - prompt (# if root, otherwise $) (bold/white)
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PS1="\[${bold}${fg_green}\]\u@\h:\[${fg_blue}\]\w\[${fg_white}\]\\$\[${reset}\] "
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;;
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datetime)
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# A style that shows the date and time:
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# \D{%Y-%m-%d} - the year/month/date (in white)
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# \@ - the time (in green)
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# \$ - prompt (# if root, otherwise $) (bold/white)
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PS1="\[${fg_white}\]\D{%Y-%m-%d} \[${bold}${fg_green}\]\@\[${fg_white}\] \\$\[${reset}\] "
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;;
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git)
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# A Debian style prompt with the git info above it.
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PS1="\$(_git_info)"$'\n'"\\[${bold}${fg_green}\]\u@\h:\[${fg_blue}\]\w\[${fg_white}\]\\$\[${reset}\] "
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;;
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dwmkerr)
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# The current folder, up to 3 items shown, the git info, then the prompt.
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# Starts with a leading newline to space out commands.
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PS1=$'\n'"\[${bold}${fg_blue}\$(_pwd_max_folders 3)${reset}\] \$(_git_info)"$'\n'"\[${bold}${fg_white}\]\\$\[${reset}\] "
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;;
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# Add your own themes here!
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*)
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# Restore PS1 to its original value.
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PS1="${_original_ps1}"
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;;
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esac
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# If we are in Z-Shell convert the PS1 to use Z-Shell format.
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[ -n "$ZSH_VERSION" ] && PS1=$(_to_zsh "$PS1")
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}
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# Build a string that shows:
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# - The branch (underlined if 'main') in green
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# - A red exclamation if there are any local changes not committed
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# - An indicator of the number of stashed items, if any.
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_git_info() {
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# Don't write anything if we're not in a folder tracked by git.
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if ! [ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" == "true" ]
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then
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return
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fi
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# Local copies of the colours for this function.
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local fg_red=$(tput setaf 1)
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local fg_green=$(tput setaf 2)
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local fg_yellow=$(tput setaf 3)
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local start_underline=$(tput smul)
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local stop_underline=$(tput rmul)
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local reset=$(tput sgr0)
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# Git details.
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local git_branch_name="$(git branch --show-current)"
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local git_any_local_changes="$(git status --porcelain=v1 2>/dev/null)"
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local git_stash_count="$(git rev-list --walk-reflogs --count \
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refs/stash -- 2>/dev/null)" # Ignore error when no stashes
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local git_info=""
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if [ "${git_branch_name}" = "main" ]; then
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git_info="${fg_green}${start_underline}${git_branch_name}${reset}"
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else
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git_info="${fg_green}${git_branch_name}${reset}"
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fi
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if ! [ -z "${git_any_local_changes}" ]; then
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# Note that we have to be careful to put the exclamation mark
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# in single quotes so that it is not expanded to the last command!
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git_info="${git_info} ${fg_red}"'!'"${reset}"
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fi
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if [ "${git_stash_count:-0}" -gt 0 ]; then
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git_info="${git_info} ${fg_yellow}${git_stash_count} in stash${reset}"
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fi
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printf "${git_info}"
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}
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# Show the pwd, limited to a certain number of folders.
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_pwd_max_folders() {
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local max_folders="$1"
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# Write the PWD, replace the home path with a tilde, then cut out the last
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# of the directories, up to the max folders value.
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echo "${PWD/#$HOME/~}" | rev | cut -d'/' -f1-${max_folders} | rev
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}
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# Convert a Bash PS1 string to a ZSH PS1 string.
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_to_zsh() {
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# Note that the following sequences are not supported as they don't have
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# an Z-Shell equivalent. Mappings have been worked out from this document:
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# https://zsh.sourceforge.io/Doc/Release/Prompt-Expansion.html#Prompt-Expansion
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#
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# \l the basename of the shell's terminal device name
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# \s the name of the shell, the basename of $0 (the portion following the final slash)
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# \T the current time in 12-hour HH:MM:SS format
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# \v the version of bash (e.g., 2.00)
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# \V the release of bash, version + patch level (e.g., 2.00.0)
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# \W the basename of the current working directory, with $HOME abbreviated with a tilde
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# \# the command number of this command
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# Replace Bash special characters with Z-Shell special characters.
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# Before we echo out the PS1 value, we need to replace '\u' with '%n'. If we
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# don't do this here with shell parameter expansion, then 'echo' thinks '\u'
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# is the beginning of a unicode character. This took quite a while to work
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# out. I have left the replacement of '\u' to '%n' in the 'sed' call below
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# but it not needed as the shell expansion below handles it.
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# Note that before we replace '\$' with '%#', we replace '\$(' temporarily
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# to SHELL_EXPAND, otherwise things like '\$(_my_func)' would be transformed
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# to '%#(_my_func)', i.e. we need to replace the prompt special character
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# but not escaped shell functions.
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local zsh_ps1="$(echo ${1/\\u/%n} | sed \
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-e 's/\\\[/%{/g' \
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-e 's/\\\]/%}/g' \
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-e 's/\\\d/%w/g' \
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-e 's/\\\D/%D/g' \
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-e 's/\\\u/%n/g' \
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-e 's/\\\h/%m/g' \
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-e 's/\\\H/%M/g' \
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-e 's/\\\j/%j/g' \
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-e 's/\\\t/%*/g' \
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-e 's/\\\A/%T/g' \
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-e 's/\\\@/%@/g' \
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-e 's/\\\w/%~/g' \
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-e 's/\\\!/%!/g' \
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-e 's/\\\$(/SHELL_EXPAND/g' \
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-e 's/\\\$/%#/g' \
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-e 's/SHELL_EXPAND/\\\$(/g' \
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)"
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# Print the sequence. Note that we need to escape the % symbol.
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local zsh_ps1_escaped=$(echo "${zsh_ps1}" | sed 's/%/%%/g')
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printf "${zsh_ps1_escaped}"
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}
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