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" IDL (Interactive Data Language) indent file.
" Language: IDL (ft=idlang)
" Maintainer: Aleksandar Jelenak <ajelenak AT yahoo.com> (Invalid email address)
" Doug Kearns <dougkearns@gmail.com>
" Last change: 2022 Apr 06
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentkeys=o,O,0=endif,0=ENDIF,0=endelse,0=ENDELSE,0=endwhile,0=ENDWHILE,0=endfor,0=ENDFOR,0=endrep,0=ENDREP
setlocal indentexpr=GetIdlangIndent(v:lnum)
let b:undo_indent = "setl inde< indk<"
" Only define the function once.
if exists("*GetIdlangIndent")
finish
endif
function GetIdlangIndent(lnum)
" First non-empty line above the current line.
let pnum = prevnonblank(v:lnum-1)
" v:lnum is the first non-empty line -- zero indent.
if pnum == 0
return 0
endif
" Second non-empty line above the current line.
let pnum2 = prevnonblank(pnum-1)
" Current indent.
let curind = indent(pnum)
" Indenting of continued lines.
if getline(pnum) =~ '\$\s*\(;.*\)\=$'
if getline(pnum2) !~ '\$\s*\(;.*\)\=$'
let curind = curind+shiftwidth()
endif
else
if getline(pnum2) =~ '\$\s*\(;.*\)\=$'
let curind = curind-shiftwidth()
endif
endif
" Indenting blocks of statements.
if getline(v:lnum) =~? '^\s*\(endif\|endelse\|endwhile\|endfor\|endrep\)\>'
if getline(pnum) =~? 'begin\>'
elseif indent(v:lnum) > curind-shiftwidth()
let curind = curind-shiftwidth()
else
return -1
endif
elseif getline(pnum) =~? 'begin\>'
if indent(v:lnum) < curind+shiftwidth()
let curind = curind+shiftwidth()
else
return -1
endif
endif
return curind
endfunction
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