diff options
Diffstat (limited to 'shell/hush_doc.txt')
| -rw-r--r-- | shell/hush_doc.txt | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/shell/hush_doc.txt b/shell/hush_doc.txt index ec5dd00f2..b2fd24426 100644 --- a/shell/hush_doc.txt +++ b/shell/hush_doc.txt @@ -72,10 +72,32 @@ Dummy trailing pipes with no commands are artifacts of imperfect parsing algorithm - done_pipe() appends new pipe struct beforehand and last one ends up empty and unused. +"for" and "case" statements (ab)use progs[] to keep their data +instead of argv vector progs[] usually do. "for" keyword is forcing +pipe termination after first word, which makes hush see +"for v in..." as "for v; in...". "case" keyword does the same. +Other judiciuosly placed hacks make hush see +"case word in a) cmd1;; b) cmd2;; esac" as if it was +"case word; match a; cmd; match b; cmd2; esac" +("match" is a fictitious keyword here): + +"case word in a) cmd1;; b) cmd2; esac" - +pipe 0 res_word=NONE followup=1 SEQ + prog 0 group {}: + pipe 0 res_word=CASE followup=SEQ prog[0] 'word' + pipe 1 res_word=MATCH followup=SEQ prog[0] 'a' + pipe 2 res_word=CASEI followup=SEQ prog[0] 'cmd1' + pipe 3 res_word=MATCH followup=SEQ prog[0] 'b' + pipe 4 res_word=CASEI followup=SEQ prog[0] 'cmd2' + pipe 5 res_word=CASEI followup=SEQ prog[0] 'cmd3' + pipe 6 res_word=ESAC followup=SEQ + pipe 7 res_word=NONE followup=(null) +pipe 1 res_word=NONE followup=1 SEQ + 2008-01 - This is how hush runs commands: + Command execution /* callsite: process_command_subs */ generate_stream_from_list(struct pipe *head) - handles `cmds` |