fix: Make g:ledger_is_hledger set correctly

[Lense]

Close #175

Before commit:

g:ledger_bin value	g:ledger_is_hledger in vimrc	g:ledger_is_hledger editing file
'hledger'	unset	1
'hledger'	v:false	0
'hledger'	v:true	0 (!)
'ledger'	unset	0
'ledger'	v:false	0
'ledger'	v:true	0 (!)

After commit:

g:ledger_bin value	g:ledger_is_hledger in vimrc	g:ledger_is_hledger editing file
'hledger'	unset	1
'hledger'	v:false	0
'hledger'	v:true	1
'ledger'	unset	0
'ledger'	v:false	0
'ledger'	v:true	1

[alerque]

Your testing chart and the code change don't add up. Something else is going on. The code change is only relevant to if you have the ledger_is_hledger value manually set but have an unset value for the bin. How are you ending up with ledger_bin being unset?

[Lense]

This script recreates the truth tables with no vim config and no ledger binaries in the PATH:

#!/bin/sh                                                                                                                                                                                      
truthtable() {                                                                                                                                                                                 
        for ledger in ledger hledger ""; do                                                                                                                                                    
                for ishledger in 0 1 ""; do                                                                                                                                                    
                        /bin/echo "set: g:ledger_bin=$ledger and g:ledger_is_hledger=$ishledger";                                                                                              
                        /bin/vim --clean -c "let g:ledger_bin=$ledger" -c "let g:ledger_is_hledger=$ishledger" -c "source autoload/ledger.vim" -c "sil exe '!/bin/echo result: g:ledger_bin=' .
 g:ledger_bin . ' and g:ledger_is_hledger=' . g:ledger_is_hledger" -c q                                                                                                                        
                done                                                                                                                                                                           
        done                                                                                                                                                                                   
}                                                                                                                                                                                              
/bin/git checkout 6d12e23e7261342f9dd4a23b9dd3a504454df002                                                                                                                                          
/bin/echo patch not applied                                                                                                                                                                    
PATH=                                                                                                                                                                                          
truthtable                                                                                                                                                                                     
/bin/git checkout a49ef3fbd49a7af124f04112e3292eee4e67110a                                                                                                                                     
/bin/echo patch applied                                                                                                                                                                        
truthtable     

My output:

$ ./poc.sh 
Previous HEAD position was a49ef3f fix: Make g:ledger_is_hledger set correctly
HEAD is now at 6d12e23 refactor: Use more expressive and consistend variable names
patch not applied
set: g:ledger_bin=ledger and g:ledger_is_hledger=0
result: g:ledger_bin=hledger and g:ledger_is_hledger=0
set: g:ledger_bin=ledger and g:ledger_is_hledger=1
result: g:ledger_bin=hledger and g:ledger_is_hledger=0
set: g:ledger_bin=ledger and g:ledger_is_hledger=
result: g:ledger_bin=hledger and g:ledger_is_hledger=1
set: g:ledger_bin=hledger and g:ledger_is_hledger=0
result: g:ledger_bin=hledger and g:ledger_is_hledger=0
set: g:ledger_bin=hledger and g:ledger_is_hledger=1
result: g:ledger_bin=hledger and g:ledger_is_hledger=0
set: g:ledger_bin=hledger and g:ledger_is_hledger=
result: g:ledger_bin=hledger and g:ledger_is_hledger=1
set: g:ledger_bin= and g:ledger_is_hledger=0
result: g:ledger_bin=hledger and g:ledger_is_hledger=0
set: g:ledger_bin= and g:ledger_is_hledger=1
result: g:ledger_bin=hledger and g:ledger_is_hledger=0
set: g:ledger_bin= and g:ledger_is_hledger=
result: g:ledger_bin=hledger and g:ledger_is_hledger=1
Previous HEAD position was 6d12e23 refactor: Use more expressive and consistend variable names
HEAD is now at a49ef3f fix: Make g:ledger_is_hledger set correctly
patch applied
set: g:ledger_bin=ledger and g:ledger_is_hledger=0
result: g:ledger_bin=hledger and g:ledger_is_hledger=0
set: g:ledger_bin=ledger and g:ledger_is_hledger=1
result: g:ledger_bin=hledger and g:ledger_is_hledger=1
set: g:ledger_bin=ledger and g:ledger_is_hledger=
result: g:ledger_bin=hledger and g:ledger_is_hledger=1
set: g:ledger_bin=hledger and g:ledger_is_hledger=0
result: g:ledger_bin=hledger and g:ledger_is_hledger=0
set: g:ledger_bin=hledger and g:ledger_is_hledger=1
result: g:ledger_bin=hledger and g:ledger_is_hledger=1
set: g:ledger_bin=hledger and g:ledger_is_hledger=
result: g:ledger_bin=hledger and g:ledger_is_hledger=1
set: g:ledger_bin= and g:ledger_is_hledger=0
result: g:ledger_bin=hledger and g:ledger_is_hledger=0
set: g:ledger_bin= and g:ledger_is_hledger=1
result: g:ledger_bin=hledger and g:ledger_is_hledger=1
set: g:ledger_bin= and g:ledger_is_hledger=
result: g:ledger_bin=hledger and g:ledger_is_hledger=1

Note in particular the lines

set: g:ledger_bin=hledger and g:ledger_is_hledger=1
result: g:ledger_bin=hledger and g:ledger_is_hledger=0

g:ledger_bin does not need to be unset for setting g:ledger_is_hledger=1 to cause it to end up being false.