Browse code
ps1.sh: add variant for bash < 4.2
Indeed, ps1.sh was written and tested with bash > 4.2.
bash < 4.2 does not offer "declare -g".
Xavier G authored on20/04/2017 20:22:14 Showing1 changed files
| 1 | 1 |
new file mode 100644 |
| ... | ... |
@@ -0,0 +1,100 @@ |
| 1 |
+# Declare and fill variables providing ANSI colors enclosed between |
|
| 2 |
+# \[ and \], as per the "PROMPTING" section of man bash: |
|
| 3 |
+function declare_colors {
|
|
| 4 |
+ local ci cj cn |
|
| 5 |
+ c_normal='\[\e[0m\]' |
|
| 6 |
+ for cn in {,bright_}{black,red,green,yellow,blue,magenta,cyan,white}; do
|
|
| 7 |
+ eval "c_${cn}='\[\e[${ci:=0};${cj:=30}m\]'"
|
|
| 8 |
+ ((++cj,(cj==38)?(cj=30,++ci):1)) |
|
| 9 |
+ done |
|
| 10 |
+} |
|
| 11 |
+ |
|
| 12 |
+function disable_colors {
|
|
| 13 |
+ local cn |
|
| 14 |
+ for cn in normal {,bright_}{black,red,green,yellow,blue,magenta,cyan,white}; do
|
|
| 15 |
+ eval "c_${cn}=''"
|
|
| 16 |
+ done |
|
| 17 |
+} |
|
| 18 |
+ |
|
| 19 |
+# Generate the PS1 variable; doing that in a function allows to reflect almost |
|
| 20 |
+# anything in the prompt. |
|
| 21 |
+function generate_ps1 {
|
|
| 22 |
+ # Save the return code value (rcv) |
|
| 23 |
+ local rcv=$? |
|
| 24 |
+ |
|
| 25 |
+ # Color for brackets and braces |
|
| 26 |
+ local bc="${c_red}"
|
|
| 27 |
+ |
|
| 28 |
+ # Pick the return code color (rcc) |
|
| 29 |
+ local rcc='c_bright_green' |
|
| 30 |
+ [ $rcv -ne 0 ] && rcc='c_bright_red' |
|
| 31 |
+ |
|
| 32 |
+ local rc dstamp tstamp user host cwdir es |
|
| 33 |
+ rc=$( printf "%s[%s${rcv}%s]" "${bc}" "${!rcc}" "${bc}")
|
|
| 34 |
+ tstamp=$( printf '[%s\\t%s]' "${c_bright_yellow}" "${bc}")
|
|
| 35 |
+ user=$( printf '[%s\\u%s]' "${c_cyan}" "${bc}")
|
|
| 36 |
+ host=$( printf '{%s\\h%s}' "${c_cyan}" "${bc}")
|
|
| 37 |
+ cwdir=$( printf '%s\w%s ' "${c_green}" "${c_normal}")
|
|
| 38 |
+ es=$( printf '%s\$%s ' "${c_red}" "${c_normal}")
|
|
| 39 |
+ |
|
| 40 |
+ if [ "${PS1_DISPLAY_DATE}" ]; then
|
|
| 41 |
+ dstamp=$(printf '[%s\\D{%%F}%s]' "${c_bright_yellow}" "${bc}")
|
|
| 42 |
+ fi |
|
| 43 |
+ |
|
| 44 |
+ PS1="${rc}${dstamp}${tstamp}${user}${host}${cwdir}${es}"
|
|
| 45 |
+ |
|
| 46 |
+ # Also set PS2 and PS4: |
|
| 47 |
+ PS2="${c['bright_green']}"
|
|
| 48 |
+ PS4="+ ${c['cyan']}[trace]${c['normal']} "
|
|
| 49 |
+ |
|
| 50 |
+ # It makes sense to export PS4 (so that e.g. "bash foobar.sh" benefit from |
|
| 51 |
+ # it): |
|
| 52 |
+ export PS4 |
|
| 53 |
+} |
|
| 54 |
+ |
|
| 55 |
+# Provide a helper function to swiftly enable or disable the date in the |
|
| 56 |
+# prompt: |
|
| 57 |
+function ps1_toggle_date {
|
|
| 58 |
+ if [ "${PS1_DISPLAY_DATE}" ]; then
|
|
| 59 |
+ unset PS1_DISPLAY_DATE |
|
| 60 |
+ else |
|
| 61 |
+ PS1_DISPLAY_DATE='yes' |
|
| 62 |
+ fi |
|
| 63 |
+} |
|
| 64 |
+ |
|
| 65 |
+# Provide a helper function to swiftly enable or disable colors in the |
|
| 66 |
+# prompt: |
|
| 67 |
+function ps1_toggle_colors {
|
|
| 68 |
+ if [ "${PS1_USE_COLORS}" ]; then
|
|
| 69 |
+ unset PS1_USE_COLORS |
|
| 70 |
+ disable_colors |
|
| 71 |
+ else |
|
| 72 |
+ declare_colors |
|
| 73 |
+ PS1_USE_COLORS='yes' |
|
| 74 |
+ fi |
|
| 75 |
+} |
|
| 76 |
+ |
|
| 77 |
+# Provide a helper function to swiftly reduce the prompt to '$ ' -- this is |
|
| 78 |
+# useful e.g. for documentation purposes, when one wants to run a few commands |
|
| 79 |
+# and copy the whole terminal output without the prompt (which usually reflects |
|
| 80 |
+# undesired details such as user and hostname): |
|
| 81 |
+function ps1_toggle_prompt {
|
|
| 82 |
+ local min_prompt='\$ ' |
|
| 83 |
+ if [ "${PS1}" == "${min_prompt}" ]; then
|
|
| 84 |
+ PROMPT_COMMAND='generate_ps1' |
|
| 85 |
+ generate_ps1 |
|
| 86 |
+ else |
|
| 87 |
+ unset PROMPT_COMMAND |
|
| 88 |
+ PS1="${min_prompt}"
|
|
| 89 |
+ fi |
|
| 90 |
+} |
|
| 91 |
+ |
|
| 92 |
+# By default, use colors but do not display the date: |
|
| 93 |
+ps1_toggle_colors |
|
| 94 |
+#ps1_toggle_date |
|
| 95 |
+ |
|
| 96 |
+# Instruct bash to regenerate PS1 before printing the prompt: |
|
| 97 |
+PROMPT_COMMAND='generate_ps1' |
|
| 98 |
+ |
|
| 99 |
+# Generate PS1 at least once: |
|
| 100 |
+generate_ps1 |