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Adding detailed PROMPT_COMMAND configuration explanation for #250 and #238.

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Martin Dvorak 2018-02-18 09:51:53 +01:00
parent 0bfb65b6ad
commit be13501e30
1 changed files with 10 additions and 0 deletions
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src/hstr.c
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@ -182,6 +182,16 @@ static const char *INSTALL_BASH_STRING=
"\nexport HISTCONTROL=ignorespace # leading space hides commands from history"
"\nexport HISTFILESIZE=10000 # increase history file size (default is 500)"
"\nexport HISTSIZE=${HISTFILESIZE} # increase history size (default is 500)"
// PROMPT_COMMAND considerations:
// history -a ... append NEW entries from memory to .bash_history (i.e. flush to file where HSTR reads commands)
// history -n ... append NEW entries from .bash_history to memory i.e. NOT entire history reload
// history -c ... CLEAR in memory history (keeps .bash_history content)
// history -r ... append ALL entries from .bash_history to memory (useful to sync DIFFERENT Bash sessions)
// Conclusion:
// -a -n ... Fastest and almost-consistent option i.e. there is efficiency/integrity trade-off
// It works correctly if memory entries are not deleted by HSTR. It doesn't synchronize history
// across different Bash sessions.
// -c -r ... Forces entire .bash_history to be reloaded (handles history deletes, synchronizes different Bash sessions)
"\nexport PROMPT_COMMAND=\"history -a; history -n; ${PROMPT_COMMAND}\" # mem/file sync"
"\n# if this is interactive shell, then bind hh to Ctrl-r (for Vi mode check doc)"
// IMPROVE hh (win10) vs. hstr (cygwin) binary on various platforms must be resolved